Neutron-Scattering Measurements of Spin Excitations in LaFeAsO and Ba(Fe0.953Co0.047)2As2: Evidence for a Sharp Enhancement of Spin Fluctuations by Nematic Order
Inelastic neutron scattering is employed to investigate the impact of electronic nematic order on the magnetic spectra of LaFeAsO and Ba(Fe0.953Co0.047)2As2. These materials are ideal to study the paramagnetic-nematic state, since the nematic order, signaled by the tetragonal-to-orthorhombic transit...
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| Veröffentlicht in: | Physical review letters 2015-02, Vol.114 (5) |
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| creator | Zhang, Qiang Fernandes, Rafael M Lamsal, Jagat Yan, Jiaqiang Chi, Songxue Tucker, Gregory S Pratt, Daniel K Lynn, Jeffrey W McCallum, R W Canfield, Paul C Lograsso, Thomas A Goldman, Alan I Vaknin, David McQueeney, Robert J |
| description | Inelastic neutron scattering is employed to investigate the impact of electronic nematic order on the magnetic spectra of LaFeAsO and Ba(Fe0.953Co0.047)2As2. These materials are ideal to study the paramagnetic-nematic state, since the nematic order, signaled by the tetragonal-to-orthorhombic transition at TS, sets in well above the stripe antiferromagnetic ordering at TN. We find that the temperature-dependent dynamic susceptibility displays an anomaly at TS followed by a sharp enhancement in the spin-spin correlation length, revealing a strong feedback effect of nematic order on the low-energy magnetic spectrum. Our findings can be consistently described by a model that attributes the structural or nematic transition to magnetic fluctuations, and unveils the key role played by nematic order in promoting the long-range stripe antiferromagnetic order in iron pnictides. |
| doi_str_mv | 10.1103/PhysRevLett.114.057001 |
| format | Article |
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(ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)</creatorcontrib><description>Inelastic neutron scattering is employed to investigate the impact of electronic nematic order on the magnetic spectra of LaFeAsO and Ba(Fe0.953Co0.047)2As2. These materials are ideal to study the paramagnetic-nematic state, since the nematic order, signaled by the tetragonal-to-orthorhombic transition at TS, sets in well above the stripe antiferromagnetic ordering at TN. We find that the temperature-dependent dynamic susceptibility displays an anomaly at TS followed by a sharp enhancement in the spin-spin correlation length, revealing a strong feedback effect of nematic order on the low-energy magnetic spectrum. 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(ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)</creatorcontrib><title>Neutron-Scattering Measurements of Spin Excitations in LaFeAsO and Ba(Fe0.953Co0.047)2As2: Evidence for a Sharp Enhancement of Spin Fluctuations by Nematic Order</title><title>Physical review letters</title><description>Inelastic neutron scattering is employed to investigate the impact of electronic nematic order on the magnetic spectra of LaFeAsO and Ba(Fe0.953Co0.047)2As2. These materials are ideal to study the paramagnetic-nematic state, since the nematic order, signaled by the tetragonal-to-orthorhombic transition at TS, sets in well above the stripe antiferromagnetic ordering at TN. We find that the temperature-dependent dynamic susceptibility displays an anomaly at TS followed by a sharp enhancement in the spin-spin correlation length, revealing a strong feedback effect of nematic order on the low-energy magnetic spectrum. Our findings can be consistently described by a model that attributes the structural or nematic transition to magnetic fluctuations, and unveils the key role played by nematic order in promoting the long-range stripe antiferromagnetic order in iron pnictides.</description><subject>Antiferromagnetism</subject><subject>CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY</subject><subject>Electronics</subject><subject>Feedback</subject><subject>Fluctuation</subject><subject>Low energy</subject><subject>MATERIALS SCIENCE</subject><subject>Mathematical models</subject><subject>Nematic</subject><subject>Order disorder</subject><issn>0031-9007</issn><issn>1079-7114</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNo9kN1KAzEQRoMoWKuvIMGrerF1kv3Jrne1bFWorVi9LtnsxK60Sd1ki30c39SIxavh--ZwYIaQSwZDxiC-eV7t3Qvupuh9KJIhpAKAHZEeA1FEIlTHpAcQs6gAEKfkzLkPCATP8h75nmHnW2uihZLeY9uYd_qE0nUtbtB4R62mi21jaPmlGi99Y42jIU7lBEduTqWp6Z0cTBCGRRqPLQwhEdd85PgtLXdNjUYh1balki5Wst3S0qxk6H7l_-7JulO-O8irPZ3hJgRF522N7Tk50XLt8OIw--RtUr6OH6Lp_P5xPJpGlsXgI62KhEtZ12lWCI2VTpTKM6hBAE9EnWdSyAIrkXGRKI1JFVeagw5wHhYxxH1y9ee1zjdLF65FtVLWGFR-yTgXLGUBGvxB29Z-duj8ctM4heu1NGg7t2Qiz1iRhp_HPyIQfIA</recordid><startdate>20150204</startdate><enddate>20150204</enddate><creator>Zhang, Qiang</creator><creator>Fernandes, Rafael M</creator><creator>Lamsal, Jagat</creator><creator>Yan, Jiaqiang</creator><creator>Chi, Songxue</creator><creator>Tucker, Gregory S</creator><creator>Pratt, Daniel K</creator><creator>Lynn, Jeffrey W</creator><creator>McCallum, R W</creator><creator>Canfield, Paul C</creator><creator>Lograsso, Thomas A</creator><creator>Goldman, Alan I</creator><creator>Vaknin, David</creator><creator>McQueeney, Robert J</creator><general>American Physical Society (APS)</general><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OIOZB</scope><scope>OTOTI</scope></search><sort><creationdate>20150204</creationdate><title>Neutron-Scattering Measurements of Spin Excitations in LaFeAsO and Ba(Fe0.953Co0.047)2As2: Evidence for a Sharp Enhancement of Spin Fluctuations by Nematic Order</title><author>Zhang, Qiang ; Fernandes, Rafael M ; Lamsal, Jagat ; Yan, Jiaqiang ; Chi, Songxue ; Tucker, Gregory S ; Pratt, Daniel K ; Lynn, Jeffrey W ; McCallum, R W ; Canfield, Paul C ; Lograsso, Thomas A ; Goldman, Alan I ; Vaknin, David ; McQueeney, Robert J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-o130t-fc942aadd5697febf4cc860d070247d86a7a9eb76274cfe4b3bf20f69787a9303</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Antiferromagnetism</topic><topic>CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY</topic><topic>Electronics</topic><topic>Feedback</topic><topic>Fluctuation</topic><topic>Low energy</topic><topic>MATERIALS SCIENCE</topic><topic>Mathematical models</topic><topic>Nematic</topic><topic>Order disorder</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhang, Qiang</creatorcontrib><creatorcontrib>Fernandes, Rafael M</creatorcontrib><creatorcontrib>Lamsal, Jagat</creatorcontrib><creatorcontrib>Yan, Jiaqiang</creatorcontrib><creatorcontrib>Chi, Songxue</creatorcontrib><creatorcontrib>Tucker, Gregory S</creatorcontrib><creatorcontrib>Pratt, Daniel K</creatorcontrib><creatorcontrib>Lynn, Jeffrey W</creatorcontrib><creatorcontrib>McCallum, R W</creatorcontrib><creatorcontrib>Canfield, Paul C</creatorcontrib><creatorcontrib>Lograsso, Thomas A</creatorcontrib><creatorcontrib>Goldman, Alan I</creatorcontrib><creatorcontrib>Vaknin, David</creatorcontrib><creatorcontrib>McQueeney, Robert J</creatorcontrib><creatorcontrib>Ames Lab., Ames, IA (United States)</creatorcontrib><creatorcontrib>Oak Ridge National Lab. 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(ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Neutron-Scattering Measurements of Spin Excitations in LaFeAsO and Ba(Fe0.953Co0.047)2As2: Evidence for a Sharp Enhancement of Spin Fluctuations by Nematic Order</atitle><jtitle>Physical review letters</jtitle><date>2015-02-04</date><risdate>2015</risdate><volume>114</volume><issue>5</issue><issn>0031-9007</issn><eissn>1079-7114</eissn><abstract>Inelastic neutron scattering is employed to investigate the impact of electronic nematic order on the magnetic spectra of LaFeAsO and Ba(Fe0.953Co0.047)2As2. These materials are ideal to study the paramagnetic-nematic state, since the nematic order, signaled by the tetragonal-to-orthorhombic transition at TS, sets in well above the stripe antiferromagnetic ordering at TN. We find that the temperature-dependent dynamic susceptibility displays an anomaly at TS followed by a sharp enhancement in the spin-spin correlation length, revealing a strong feedback effect of nematic order on the low-energy magnetic spectrum. Our findings can be consistently described by a model that attributes the structural or nematic transition to magnetic fluctuations, and unveils the key role played by nematic order in promoting the long-range stripe antiferromagnetic order in iron pnictides.</abstract><cop>United States</cop><pub>American Physical Society (APS)</pub><doi>10.1103/PhysRevLett.114.057001</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Antiferromagnetism CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Electronics Feedback Fluctuation Low energy MATERIALS SCIENCE Mathematical models Nematic Order disorder |
| title | Neutron-Scattering Measurements of Spin Excitations in LaFeAsO and Ba(Fe0.953Co0.047)2As2: Evidence for a Sharp Enhancement of Spin Fluctuations by Nematic Order |
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