Physical properties and electronic band structure of noncentrosymmetric Th7Co3 superconductor
The physical properties of the noncentrosymmetric superconductor Th7Co3 have been investigated by means of ac-magnetic susceptibility, magnetization, specific heat, electrical resistivity, magnetoresistance and Hall effect measurements. From these data it is established that Th7Co3 is a dirty type-I...
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| Veröffentlicht in: | Journal of physics. Condensed matter 2016-05, Vol.28 (20), p.205701-205701 |
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| container_title | Journal of physics. Condensed matter |
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| creator | Sahakyan, M Tran, V H |
| description | The physical properties of the noncentrosymmetric superconductor Th7Co3 have been investigated by means of ac-magnetic susceptibility, magnetization, specific heat, electrical resistivity, magnetoresistance and Hall effect measurements. From these data it is established that Th7Co3 is a dirty type-II superconductor with Tc=1.8±0.02 K, Hc2orb |
| doi_str_mv | 10.1088/0953-8984/28/20/205701 |
| format | Article |
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From these data it is established that Th7Co3 is a dirty type-II superconductor with Tc=1.8±0.02 K, Hc2orb<Hc2(0)∼10 kOe<Hc2p and moderate electron-phonon coupling λel−ph=0.56. Some evidences for anisotropic superconducting gap are found, including e.g. reduced specific heat jump (ΔCp/γTc=1.01) at Tc, diminished superconducting energy gap (Δ0/kBTc=2.17) as compared to the BCS values, power law field dependence of the Sommerfeld coefficient at 0.4 K (Cp/T∝H0.6), and a concave curvature of the Hc2(Tc) line. The magnitudes of the thermodynamic critical field and the energy gap are consistent with mean-squared anisotropy parameter 〈a2〉∼0.23. The electronic specific heat in the superconducting state is reasonably fitted to an oblate spheroidal gap model. Calculations of scalar relativistic and fully relativistic electronic band structures reveal considerable differences in the degenerate structure, resulting from asymmetric spin-orbit coupling (ASOC). A large splitting energy of spin-up spin-down bands at the Fermi level EF, ΔEASOC∼100 meV is observed and a sizeable ratio ΔEASOC/kBTc∼640 could classify the studied compound into the class of noncentrosymmetric superconductors with strong ASOC. The noncentrosymmetry of the crystal structure and the atomic relativistic effects are both responsible for an importance of ASOC in Th7Co3. The calculated results for the density of states show a Van Hove singularity just below EF and dominant role of the 6d electrons of Th to the superconductivity.</description><identifier>ISSN: 0953-8984</identifier><identifier>EISSN: 1361-648X</identifier><identifier>DOI: 10.1088/0953-8984/28/20/205701</identifier><identifier>PMID: 27120582</identifier><identifier>CODEN: JCOMEL</identifier><language>eng</language><publisher>England: IOP Publishing</publisher><subject>anisotropic energy gap ; asymmetric spin-orbit coupling ; noncentrosymmetric superconductor ; relativistic effect</subject><ispartof>Journal of physics. 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Matter</addtitle><description>The physical properties of the noncentrosymmetric superconductor Th7Co3 have been investigated by means of ac-magnetic susceptibility, magnetization, specific heat, electrical resistivity, magnetoresistance and Hall effect measurements. From these data it is established that Th7Co3 is a dirty type-II superconductor with Tc=1.8±0.02 K, Hc2orb<Hc2(0)∼10 kOe<Hc2p and moderate electron-phonon coupling λel−ph=0.56. Some evidences for anisotropic superconducting gap are found, including e.g. reduced specific heat jump (ΔCp/γTc=1.01) at Tc, diminished superconducting energy gap (Δ0/kBTc=2.17) as compared to the BCS values, power law field dependence of the Sommerfeld coefficient at 0.4 K (Cp/T∝H0.6), and a concave curvature of the Hc2(Tc) line. The magnitudes of the thermodynamic critical field and the energy gap are consistent with mean-squared anisotropy parameter 〈a2〉∼0.23. The electronic specific heat in the superconducting state is reasonably fitted to an oblate spheroidal gap model. Calculations of scalar relativistic and fully relativistic electronic band structures reveal considerable differences in the degenerate structure, resulting from asymmetric spin-orbit coupling (ASOC). A large splitting energy of spin-up spin-down bands at the Fermi level EF, ΔEASOC∼100 meV is observed and a sizeable ratio ΔEASOC/kBTc∼640 could classify the studied compound into the class of noncentrosymmetric superconductors with strong ASOC. The noncentrosymmetry of the crystal structure and the atomic relativistic effects are both responsible for an importance of ASOC in Th7Co3. The calculated results for the density of states show a Van Hove singularity just below EF and dominant role of the 6d electrons of Th to the superconductivity.</description><subject>anisotropic energy gap</subject><subject>asymmetric spin-orbit coupling</subject><subject>noncentrosymmetric superconductor</subject><subject>relativistic effect</subject><issn>0953-8984</issn><issn>1361-648X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNo9kEtrwzAMgM3YWLtuf6HkuEtWv2I7x1H2gsJ26GCXYRzboSmJndnJIf9-Du0GAiH0SUgfAGsEHxAUYgPLguSiFHSDxQbDFAWH6AIsEWEoZ1R8XYLlP7QANzEeIYRUEHoNFpijNCDwEnx_HKbYaNVmffC9DUNjY6acyWxr9RC8a3RWzXUcwqiHMdjM15nzTluX2nHqOjuEBO0PfOtJFse0RHtnEuzDLbiqVRvt3TmvwOfz0377mu_eX962j7u8wQUdco5IgUpDtabc1lyRghNIjWBMQ1bXkFEFK2NrRZURKBUU0YoJogyGNTGWrMD9aW964me0cZBdE7VtW-WsH6NEXPCSMI6LhK7P6Fh11sg-NJ0Kk_xTkgB8Ahrfy6Mfg0uXSwTl7F3OSuWsVGIhMZQn7-QXPFh0rg</recordid><startdate>20160525</startdate><enddate>20160525</enddate><creator>Sahakyan, M</creator><creator>Tran, V H</creator><general>IOP Publishing</general><scope>NPM</scope><scope>7X8</scope></search><sort><creationdate>20160525</creationdate><title>Physical properties and electronic band structure of noncentrosymmetric Th7Co3 superconductor</title><author>Sahakyan, M ; Tran, V H</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-i254t-713519d4cc47ef7a357304d866c06ff064a0bdefa4ad814a0414b683ad20f3de3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>anisotropic energy gap</topic><topic>asymmetric spin-orbit coupling</topic><topic>noncentrosymmetric superconductor</topic><topic>relativistic effect</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sahakyan, M</creatorcontrib><creatorcontrib>Tran, V H</creatorcontrib><collection>PubMed</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of physics. Condensed matter</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sahakyan, M</au><au>Tran, V H</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Physical properties and electronic band structure of noncentrosymmetric Th7Co3 superconductor</atitle><jtitle>Journal of physics. Condensed matter</jtitle><stitle>JPhysCM</stitle><addtitle>J. Phys.: Condens. Matter</addtitle><date>2016-05-25</date><risdate>2016</risdate><volume>28</volume><issue>20</issue><spage>205701</spage><epage>205701</epage><pages>205701-205701</pages><issn>0953-8984</issn><eissn>1361-648X</eissn><coden>JCOMEL</coden><abstract>The physical properties of the noncentrosymmetric superconductor Th7Co3 have been investigated by means of ac-magnetic susceptibility, magnetization, specific heat, electrical resistivity, magnetoresistance and Hall effect measurements. From these data it is established that Th7Co3 is a dirty type-II superconductor with Tc=1.8±0.02 K, Hc2orb<Hc2(0)∼10 kOe<Hc2p and moderate electron-phonon coupling λel−ph=0.56. Some evidences for anisotropic superconducting gap are found, including e.g. reduced specific heat jump (ΔCp/γTc=1.01) at Tc, diminished superconducting energy gap (Δ0/kBTc=2.17) as compared to the BCS values, power law field dependence of the Sommerfeld coefficient at 0.4 K (Cp/T∝H0.6), and a concave curvature of the Hc2(Tc) line. The magnitudes of the thermodynamic critical field and the energy gap are consistent with mean-squared anisotropy parameter 〈a2〉∼0.23. The electronic specific heat in the superconducting state is reasonably fitted to an oblate spheroidal gap model. Calculations of scalar relativistic and fully relativistic electronic band structures reveal considerable differences in the degenerate structure, resulting from asymmetric spin-orbit coupling (ASOC). A large splitting energy of spin-up spin-down bands at the Fermi level EF, ΔEASOC∼100 meV is observed and a sizeable ratio ΔEASOC/kBTc∼640 could classify the studied compound into the class of noncentrosymmetric superconductors with strong ASOC. The noncentrosymmetry of the crystal structure and the atomic relativistic effects are both responsible for an importance of ASOC in Th7Co3. The calculated results for the density of states show a Van Hove singularity just below EF and dominant role of the 6d electrons of Th to the superconductivity.</abstract><cop>England</cop><pub>IOP Publishing</pub><pmid>27120582</pmid><doi>10.1088/0953-8984/28/20/205701</doi><tpages>15</tpages></addata></record> |
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| ispartof | Journal of physics. Condensed matter, 2016-05, Vol.28 (20), p.205701-205701 |
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| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | anisotropic energy gap asymmetric spin-orbit coupling noncentrosymmetric superconductor relativistic effect |
| title | Physical properties and electronic band structure of noncentrosymmetric Th7Co3 superconductor |
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