Evidence for structural and electronic instabilities at intermediate temperatures in K-(BEDT-TTF){sub 2}X for X=Cu[N(CN){sub 2}]Cl, Cu[N(CN){sub 2}]Br and Cu(NCS){sub 2} : implications for the phase diagram of these quasi-2D organic superconductors
We present high-resolution measurements of the coefficient of thermal expansion {alpha}(T)={partial_derivative} ln l(T)/{partial_derivative}T of the quasi-two-dimensional (quasi-2D) salts {kappa}-(BEDT-TTF){sub 2}X with X=Cu[N(CN){sub 2}]Cl, Cu[N(CN){sub 2}]Br and Cu(NCS){sub 2} in the temperature r...
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| Veröffentlicht in: | Physical review. B, Condensed matter Condensed matter, 2002-04, Vol.65 (14 ; Apr. 1, 2002) |
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| container_title | Physical review. B, Condensed matter |
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| creator | Muller, J. Lang, M. Steglich, F. Schlueter, J. A. Kini, A. M. Sasaki T. Materials Science Division Max-Planck-Inst. fur Chemische Physik fester Stoffe Physikalisches Inst. der Univ. Frankfurt Tohoku Univ |
| description | We present high-resolution measurements of the coefficient of thermal expansion {alpha}(T)={partial_derivative} ln l(T)/{partial_derivative}T of the quasi-two-dimensional (quasi-2D) salts {kappa}-(BEDT-TTF){sub 2}X with X=Cu[N(CN){sub 2}]Cl, Cu[N(CN){sub 2}]Br and Cu(NCS){sub 2} in the temperature range T |
| doi_str_mv | 10.1103/PhysRevB.65.144521 |
| format | Article |
| fullrecord | <record><control><sourceid>osti</sourceid><recordid>TN_cdi_osti_scitechconnect_949358</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>949358</sourcerecordid><originalsourceid>FETCH-osti_scitechconnect_9493583</originalsourceid><addsrcrecordid>eNqNkE1Lw0AQhhdRsH78AU_jrUJTs0lTG8FL0xZBKKI5FETKdjNtVpLdurMpiPi_Pbot9uLJuQw88868M8PYBQ-7nIfx9WP5QU-4GXb7SZf3eknED1iLh2kSxDdpcshaIe_HAR9E6TE7IXoLfUT9tMW-xxtVoJYIS2OBnG2ka6yoQOgCsELprNFKgtLkxEJVyikkEM4Dh7bGQgmH4LBeoxW-0xeVhoegPRyP8iDPJ1ef1Cwg-prtDGZ3WfMybWfTPX7Nqg78ZUO7s8-a9jR73lO4BVWvKyWFU0bTbpwrEdalIAS_x8qKGsxyCz14bwSpIBqBsSuxvYAav6I0uvAXGktn7GgpKsLz33zKLifjPLsPDDk1J6kcytLLtX_BPO2lcTKI_6P5ASfkgTc</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>Evidence for structural and electronic instabilities at intermediate temperatures in K-(BEDT-TTF){sub 2}X for X=Cu[N(CN){sub 2}]Cl, Cu[N(CN){sub 2}]Br and Cu(NCS){sub 2} : implications for the phase diagram of these quasi-2D organic superconductors</title><source>American Physical Society Journals</source><creator>Muller, J. ; Lang, M. ; Steglich, F. ; Schlueter, J. A. ; Kini, A. M. ; Sasaki T. ; Materials Science Division ; Max-Planck-Inst. fur Chemische Physik fester Stoffe ; Physikalisches Inst. der Univ. Frankfurt ; Tohoku Univ</creator><creatorcontrib>Muller, J. ; Lang, M. ; Steglich, F. ; Schlueter, J. A. ; Kini, A. M. ; Sasaki T. ; Materials Science Division ; Max-Planck-Inst. fur Chemische Physik fester Stoffe ; Physikalisches Inst. der Univ. Frankfurt ; Tohoku Univ ; Argonne National Lab. (ANL), Argonne, IL (United States)</creatorcontrib><description>We present high-resolution measurements of the coefficient of thermal expansion {alpha}(T)={partial_derivative} ln l(T)/{partial_derivative}T of the quasi-two-dimensional (quasi-2D) salts {kappa}-(BEDT-TTF){sub 2}X with X=Cu[N(CN){sub 2}]Cl, Cu[N(CN){sub 2}]Br and Cu(NCS){sub 2} in the temperature range T<{approx}150 K. Three distinct kinds of anomalies corresponding to different temperature ranges have been identified. These are (A) phase-transition anomalies into the superconducting (X=Cu(NCS){sub 2}, Cu[N(CN){sub 2}]Br) and antiferromagnetic (X=Cu[N(CN){sub 2}]Cl) ground state, (B) phase-transition-like anomalies at intermediate temperatures (30-50) K for the superconducting salts, and (C) kinetic, glasslike transitions at higher temperatures, i.e., (70-80) K for all compounds. By a thermodynamic analysis of the discontinuities at the second-order phase transitions that characterize the ground state of system (A), the uniaxial-pressure coefficients of the respective transition temperatures could be determined. We find that in contrast to what has been frequently assumed, the intraplane-pressure coefficients of Tc for this family of quasi-2D superconductors do not reveal a simple form of systematics. This demonstrates that attempts to model these systems by solely considering in-plane electronic parameters are not appropriate. At intermediate temperatures (B), distinct anomalies reminiscent of second-order phase transitions have been found at T*=38 K and 45 K for the superconducting X=Cu(NCS){sub 2} and Cu[N(CN){sub 2}]Br salts, respectively. Most interestingly, we find that the signs of the uniaxial pressure coefficients of T*, {partial_derivative}T*/{partial_derivative}p{sub i} (i=a,b,c), are strictly anticorrelated with those of {Tc}. Based on comparative studies including the nonsuperconducting X=Cu[N(CN){sub 2}]Cl salt as well as isotopically labeled compounds, we propose that T* marks the transition to a density-wave state forming on minor, quasi-1D parts of the Fermi surface. Our results are compatible with two competing order parameters that form on disjunct portions of the Fermi surface. At elevated temperatures (C), all compounds show {alpha}(T) anomalies that can be identified with a kinetic, glasslike transition where, below a characteristic temperature T{sub g}, disorder in the orientational degrees of freedom of the terminal ethylene groups becomes frozen in. Our results provide a natural explanation for the unusual time- and cooling-rate dependences of the ground-state properties in the hydrogenated and deuterated Cu[N(CN){sub 2}]Br salts reported in the literature.</description><identifier>ISSN: 0163-1829</identifier><identifier>EISSN: 1095-3795</identifier><identifier>DOI: 10.1103/PhysRevB.65.144521</identifier><language>eng</language><publisher>United States</publisher><subject>BEDT-TTF ; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; DEGREES OF FREEDOM ; FERMI LEVEL ; GROUND STATES ; ORDER PARAMETERS ; ORGANIC SUPERCONDUCTORS ; PHASE DIAGRAMS ; PRESSURE COEFFICIENT ; SUPERCONDUCTORS ; THERMAL EXPANSION ; TRANSITION TEMPERATURE</subject><ispartof>Physical review. B, Condensed matter, 2002-04, Vol.65 (14 ; Apr. 1, 2002)</ispartof><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/949358$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Muller, J.</creatorcontrib><creatorcontrib>Lang, M.</creatorcontrib><creatorcontrib>Steglich, F.</creatorcontrib><creatorcontrib>Schlueter, J. A.</creatorcontrib><creatorcontrib>Kini, A. M.</creatorcontrib><creatorcontrib>Sasaki T.</creatorcontrib><creatorcontrib>Materials Science Division</creatorcontrib><creatorcontrib>Max-Planck-Inst. fur Chemische Physik fester Stoffe</creatorcontrib><creatorcontrib>Physikalisches Inst. der Univ. Frankfurt</creatorcontrib><creatorcontrib>Tohoku Univ</creatorcontrib><creatorcontrib>Argonne National Lab. (ANL), Argonne, IL (United States)</creatorcontrib><title>Evidence for structural and electronic instabilities at intermediate temperatures in K-(BEDT-TTF){sub 2}X for X=Cu[N(CN){sub 2}]Cl, Cu[N(CN){sub 2}]Br and Cu(NCS){sub 2} : implications for the phase diagram of these quasi-2D organic superconductors</title><title>Physical review. B, Condensed matter</title><description>We present high-resolution measurements of the coefficient of thermal expansion {alpha}(T)={partial_derivative} ln l(T)/{partial_derivative}T of the quasi-two-dimensional (quasi-2D) salts {kappa}-(BEDT-TTF){sub 2}X with X=Cu[N(CN){sub 2}]Cl, Cu[N(CN){sub 2}]Br and Cu(NCS){sub 2} in the temperature range T<{approx}150 K. Three distinct kinds of anomalies corresponding to different temperature ranges have been identified. These are (A) phase-transition anomalies into the superconducting (X=Cu(NCS){sub 2}, Cu[N(CN){sub 2}]Br) and antiferromagnetic (X=Cu[N(CN){sub 2}]Cl) ground state, (B) phase-transition-like anomalies at intermediate temperatures (30-50) K for the superconducting salts, and (C) kinetic, glasslike transitions at higher temperatures, i.e., (70-80) K for all compounds. By a thermodynamic analysis of the discontinuities at the second-order phase transitions that characterize the ground state of system (A), the uniaxial-pressure coefficients of the respective transition temperatures could be determined. We find that in contrast to what has been frequently assumed, the intraplane-pressure coefficients of Tc for this family of quasi-2D superconductors do not reveal a simple form of systematics. This demonstrates that attempts to model these systems by solely considering in-plane electronic parameters are not appropriate. At intermediate temperatures (B), distinct anomalies reminiscent of second-order phase transitions have been found at T*=38 K and 45 K for the superconducting X=Cu(NCS){sub 2} and Cu[N(CN){sub 2}]Br salts, respectively. Most interestingly, we find that the signs of the uniaxial pressure coefficients of T*, {partial_derivative}T*/{partial_derivative}p{sub i} (i=a,b,c), are strictly anticorrelated with those of {Tc}. Based on comparative studies including the nonsuperconducting X=Cu[N(CN){sub 2}]Cl salt as well as isotopically labeled compounds, we propose that T* marks the transition to a density-wave state forming on minor, quasi-1D parts of the Fermi surface. Our results are compatible with two competing order parameters that form on disjunct portions of the Fermi surface. At elevated temperatures (C), all compounds show {alpha}(T) anomalies that can be identified with a kinetic, glasslike transition where, below a characteristic temperature T{sub g}, disorder in the orientational degrees of freedom of the terminal ethylene groups becomes frozen in. Our results provide a natural explanation for the unusual time- and cooling-rate dependences of the ground-state properties in the hydrogenated and deuterated Cu[N(CN){sub 2}]Br salts reported in the literature.</description><subject>BEDT-TTF</subject><subject>CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY</subject><subject>DEGREES OF FREEDOM</subject><subject>FERMI LEVEL</subject><subject>GROUND STATES</subject><subject>ORDER PARAMETERS</subject><subject>ORGANIC SUPERCONDUCTORS</subject><subject>PHASE DIAGRAMS</subject><subject>PRESSURE COEFFICIENT</subject><subject>SUPERCONDUCTORS</subject><subject>THERMAL EXPANSION</subject><subject>TRANSITION TEMPERATURE</subject><issn>0163-1829</issn><issn>1095-3795</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><recordid>eNqNkE1Lw0AQhhdRsH78AU_jrUJTs0lTG8FL0xZBKKI5FETKdjNtVpLdurMpiPi_Pbot9uLJuQw88868M8PYBQ-7nIfx9WP5QU-4GXb7SZf3eknED1iLh2kSxDdpcshaIe_HAR9E6TE7IXoLfUT9tMW-xxtVoJYIS2OBnG2ka6yoQOgCsELprNFKgtLkxEJVyikkEM4Dh7bGQgmH4LBeoxW-0xeVhoegPRyP8iDPJ1ef1Cwg-prtDGZ3WfMybWfTPX7Nqg78ZUO7s8-a9jR73lO4BVWvKyWFU0bTbpwrEdalIAS_x8qKGsxyCz14bwSpIBqBsSuxvYAav6I0uvAXGktn7GgpKsLz33zKLifjPLsPDDk1J6kcytLLtX_BPO2lcTKI_6P5ASfkgTc</recordid><startdate>20020401</startdate><enddate>20020401</enddate><creator>Muller, J.</creator><creator>Lang, M.</creator><creator>Steglich, F.</creator><creator>Schlueter, J. A.</creator><creator>Kini, A. M.</creator><creator>Sasaki T.</creator><creator>Materials Science Division</creator><creator>Max-Planck-Inst. fur Chemische Physik fester Stoffe</creator><creator>Physikalisches Inst. der Univ. Frankfurt</creator><creator>Tohoku Univ</creator><scope>OTOTI</scope></search><sort><creationdate>20020401</creationdate><title>Evidence for structural and electronic instabilities at intermediate temperatures in K-(BEDT-TTF){sub 2}X for X=Cu[N(CN){sub 2}]Cl, Cu[N(CN){sub 2}]Br and Cu(NCS){sub 2} : implications for the phase diagram of these quasi-2D organic superconductors</title><author>Muller, J. ; Lang, M. ; Steglich, F. ; Schlueter, J. A. ; Kini, A. M. ; Sasaki T. ; Materials Science Division ; Max-Planck-Inst. fur Chemische Physik fester Stoffe ; Physikalisches Inst. der Univ. Frankfurt ; Tohoku Univ</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-osti_scitechconnect_9493583</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>BEDT-TTF</topic><topic>CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY</topic><topic>DEGREES OF FREEDOM</topic><topic>FERMI LEVEL</topic><topic>GROUND STATES</topic><topic>ORDER PARAMETERS</topic><topic>ORGANIC SUPERCONDUCTORS</topic><topic>PHASE DIAGRAMS</topic><topic>PRESSURE COEFFICIENT</topic><topic>SUPERCONDUCTORS</topic><topic>THERMAL EXPANSION</topic><topic>TRANSITION TEMPERATURE</topic><toplevel>online_resources</toplevel><creatorcontrib>Muller, J.</creatorcontrib><creatorcontrib>Lang, M.</creatorcontrib><creatorcontrib>Steglich, F.</creatorcontrib><creatorcontrib>Schlueter, J. A.</creatorcontrib><creatorcontrib>Kini, A. M.</creatorcontrib><creatorcontrib>Sasaki T.</creatorcontrib><creatorcontrib>Materials Science Division</creatorcontrib><creatorcontrib>Max-Planck-Inst. fur Chemische Physik fester Stoffe</creatorcontrib><creatorcontrib>Physikalisches Inst. der Univ. Frankfurt</creatorcontrib><creatorcontrib>Tohoku Univ</creatorcontrib><creatorcontrib>Argonne National Lab. (ANL), Argonne, IL (United States)</creatorcontrib><collection>OSTI.GOV</collection><jtitle>Physical review. B, Condensed matter</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Muller, J.</au><au>Lang, M.</au><au>Steglich, F.</au><au>Schlueter, J. A.</au><au>Kini, A. M.</au><au>Sasaki T.</au><au>Materials Science Division</au><au>Max-Planck-Inst. fur Chemische Physik fester Stoffe</au><au>Physikalisches Inst. der Univ. Frankfurt</au><au>Tohoku Univ</au><aucorp>Argonne National Lab. (ANL), Argonne, IL (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Evidence for structural and electronic instabilities at intermediate temperatures in K-(BEDT-TTF){sub 2}X for X=Cu[N(CN){sub 2}]Cl, Cu[N(CN){sub 2}]Br and Cu(NCS){sub 2} : implications for the phase diagram of these quasi-2D organic superconductors</atitle><jtitle>Physical review. B, Condensed matter</jtitle><date>2002-04-01</date><risdate>2002</risdate><volume>65</volume><issue>14 ; Apr. 1, 2002</issue><issn>0163-1829</issn><eissn>1095-3795</eissn><abstract>We present high-resolution measurements of the coefficient of thermal expansion {alpha}(T)={partial_derivative} ln l(T)/{partial_derivative}T of the quasi-two-dimensional (quasi-2D) salts {kappa}-(BEDT-TTF){sub 2}X with X=Cu[N(CN){sub 2}]Cl, Cu[N(CN){sub 2}]Br and Cu(NCS){sub 2} in the temperature range T<{approx}150 K. Three distinct kinds of anomalies corresponding to different temperature ranges have been identified. These are (A) phase-transition anomalies into the superconducting (X=Cu(NCS){sub 2}, Cu[N(CN){sub 2}]Br) and antiferromagnetic (X=Cu[N(CN){sub 2}]Cl) ground state, (B) phase-transition-like anomalies at intermediate temperatures (30-50) K for the superconducting salts, and (C) kinetic, glasslike transitions at higher temperatures, i.e., (70-80) K for all compounds. By a thermodynamic analysis of the discontinuities at the second-order phase transitions that characterize the ground state of system (A), the uniaxial-pressure coefficients of the respective transition temperatures could be determined. We find that in contrast to what has been frequently assumed, the intraplane-pressure coefficients of Tc for this family of quasi-2D superconductors do not reveal a simple form of systematics. This demonstrates that attempts to model these systems by solely considering in-plane electronic parameters are not appropriate. At intermediate temperatures (B), distinct anomalies reminiscent of second-order phase transitions have been found at T*=38 K and 45 K for the superconducting X=Cu(NCS){sub 2} and Cu[N(CN){sub 2}]Br salts, respectively. Most interestingly, we find that the signs of the uniaxial pressure coefficients of T*, {partial_derivative}T*/{partial_derivative}p{sub i} (i=a,b,c), are strictly anticorrelated with those of {Tc}. Based on comparative studies including the nonsuperconducting X=Cu[N(CN){sub 2}]Cl salt as well as isotopically labeled compounds, we propose that T* marks the transition to a density-wave state forming on minor, quasi-1D parts of the Fermi surface. Our results are compatible with two competing order parameters that form on disjunct portions of the Fermi surface. At elevated temperatures (C), all compounds show {alpha}(T) anomalies that can be identified with a kinetic, glasslike transition where, below a characteristic temperature T{sub g}, disorder in the orientational degrees of freedom of the terminal ethylene groups becomes frozen in. Our results provide a natural explanation for the unusual time- and cooling-rate dependences of the ground-state properties in the hydrogenated and deuterated Cu[N(CN){sub 2}]Br salts reported in the literature.</abstract><cop>United States</cop><doi>10.1103/PhysRevB.65.144521</doi></addata></record> |
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| identifier | ISSN: 0163-1829 |
| ispartof | Physical review. B, Condensed matter, 2002-04, Vol.65 (14 ; Apr. 1, 2002) |
| issn | 0163-1829 1095-3795 |
| language | eng |
| recordid | cdi_osti_scitechconnect_949358 |
| source | American Physical Society Journals |
| subjects | BEDT-TTF CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY DEGREES OF FREEDOM FERMI LEVEL GROUND STATES ORDER PARAMETERS ORGANIC SUPERCONDUCTORS PHASE DIAGRAMS PRESSURE COEFFICIENT SUPERCONDUCTORS THERMAL EXPANSION TRANSITION TEMPERATURE |
| title | Evidence for structural and electronic instabilities at intermediate temperatures in K-(BEDT-TTF){sub 2}X for X=Cu[N(CN){sub 2}]Cl, Cu[N(CN){sub 2}]Br and Cu(NCS){sub 2} : implications for the phase diagram of these quasi-2D organic superconductors |
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