Strong ( π , 0 ) spin fluctuations in β − FeSe observed by neutron spectroscopy

We have performed powder inelastic neutron scattering measurements on the unconventional superconductor beta - FeSe (T sub(c) [Asymptotically = to] 8 K). The spectra reveal highly dispersive paramagnetic fluctuations emerging from the square-lattice wave vector ([pi], 0) extending beyond 80 meV in e...

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Veröffentlicht in:	Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2015-05, Vol.91 (18), Article 180501
Hauptverfasser:	Rahn, M. C., Ewings, R. A., Sedlmaier, S. J., Clarke, S. J., Boothroyd, A. T.
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Sprache:	eng
Schlagworte:	Asymptotic properties Condensed matter Fluctuation Iron Neutron scattering Parents Phases Spectra
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container_title	Physical review. B, Condensed matter and materials physics
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creator	Rahn, M. C. Ewings, R. A. Sedlmaier, S. J. Clarke, S. J. Boothroyd, A. T.
description	We have performed powder inelastic neutron scattering measurements on the unconventional superconductor beta - FeSe (T sub(c) [Asymptotically = to] 8 K). The spectra reveal highly dispersive paramagnetic fluctuations emerging from the square-lattice wave vector ([pi], 0) extending beyond 80 meV in energy. Measurements as a function of temperature at an energy of ~ 13 meV did not show any variation from T sub(c) to 104 K. The results show that FeSe is close to an instability towards ([pi], 0) antiferromagnetism that is characteristic of the parent phases of the high-T sub(c) iron arsenide superconductors, and that the iron paramagnetic moment is neither affected by the orthorhombic-to-tetragonal structural transition at T sub(s) [Asymptotically = to] 90 K nor does it undergo a change in spin state over the temperature range studied.
doi_str_mv	10.1103/PhysRevB.91.180501
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C. ; Ewings, R. A. ; Sedlmaier, S. J. ; Clarke, S. J. ; Boothroyd, A. T.</creator><creatorcontrib>Rahn, M. C. ; Ewings, R. A. ; Sedlmaier, S. J. ; Clarke, S. J. ; Boothroyd, A. T.</creatorcontrib><description>We have performed powder inelastic neutron scattering measurements on the unconventional superconductor beta - FeSe (T sub(c) [Asymptotically = to] 8 K). The spectra reveal highly dispersive paramagnetic fluctuations emerging from the square-lattice wave vector ([pi], 0) extending beyond 80 meV in energy. Measurements as a function of temperature at an energy of ~ 13 meV did not show any variation from T sub(c) to 104 K. The results show that FeSe is close to an instability towards ([pi], 0) antiferromagnetism that is characteristic of the parent phases of the high-T sub(c) iron arsenide superconductors, and that the iron paramagnetic moment is neither affected by the orthorhombic-to-tetragonal structural transition at T sub(s) [Asymptotically = to] 90 K nor does it undergo a change in spin state over the temperature range studied.</description><identifier>ISSN: 1098-0121</identifier><identifier>EISSN: 1550-235X</identifier><identifier>DOI: 10.1103/PhysRevB.91.180501</identifier><language>eng</language><subject>Asymptotic properties ; Condensed matter ; Fluctuation ; Iron ; Neutron scattering ; Parents ; Phases ; Spectra</subject><ispartof>Physical review. 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B, Condensed matter and materials physics</title><description>We have performed powder inelastic neutron scattering measurements on the unconventional superconductor beta - FeSe (T sub(c) [Asymptotically = to] 8 K). The spectra reveal highly dispersive paramagnetic fluctuations emerging from the square-lattice wave vector ([pi], 0) extending beyond 80 meV in energy. Measurements as a function of temperature at an energy of ~ 13 meV did not show any variation from T sub(c) to 104 K. The results show that FeSe is close to an instability towards ([pi], 0) antiferromagnetism that is characteristic of the parent phases of the high-T sub(c) iron arsenide superconductors, and that the iron paramagnetic moment is neither affected by the orthorhombic-to-tetragonal structural transition at T sub(s) [Asymptotically = to] 90 K nor does it undergo a change in spin state over the temperature range studied.</description><subject>Asymptotic properties</subject><subject>Condensed matter</subject><subject>Fluctuation</subject><subject>Iron</subject><subject>Neutron scattering</subject><subject>Parents</subject><subject>Phases</subject><subject>Spectra</subject><issn>1098-0121</issn><issn>1550-235X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNo1kEFOwzAURC0EEqVwAVZeFomU_-2E2kuoKCBVAlGQ2Fm2Y0NQmoQ4qZQdS9YchYPAHTgJqQqrP1-aGY0eIYcIY0TgJ7fPXbhzq_OxxDEKSAC3yACTBCLGk8ftXoMUESDDXbIXwgsAxjJmA7JYNHVZPNER_X6jxxToEQ1VVlCft7ZpdZOVRaD9__VJf94_6MwtHC1NcPXKpdR0tHDtuqAPOduLYMuq2yc7XufBHfzdIXmYXdxPr6L5zeX19GweWc5kE7EYNWjnnZ74FMGDiGVqZGww9dIL0HJijMDY2MQi41ZKA8IbzvvlAjDlQzLa9FZ1-dq60KhlFqzLc124sg0KJyhkwk657K1sY7X9xlA7r6o6W-q6UwhqTVD9E1QS1YYg_wVX0Gcz</recordid><startdate>20150508</startdate><enddate>20150508</enddate><creator>Rahn, M. 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B, Condensed matter and materials physics</jtitle><date>2015-05-08</date><risdate>2015</risdate><volume>91</volume><issue>18</issue><artnum>180501</artnum><issn>1098-0121</issn><eissn>1550-235X</eissn><abstract>We have performed powder inelastic neutron scattering measurements on the unconventional superconductor beta - FeSe (T sub(c) [Asymptotically = to] 8 K). The spectra reveal highly dispersive paramagnetic fluctuations emerging from the square-lattice wave vector ([pi], 0) extending beyond 80 meV in energy. Measurements as a function of temperature at an energy of ~ 13 meV did not show any variation from T sub(c) to 104 K. The results show that FeSe is close to an instability towards ([pi], 0) antiferromagnetism that is characteristic of the parent phases of the high-T sub(c) iron arsenide superconductors, and that the iron paramagnetic moment is neither affected by the orthorhombic-to-tetragonal structural transition at T sub(s) [Asymptotically = to] 90 K nor does it undergo a change in spin state over the temperature range studied.</abstract><doi>10.1103/PhysRevB.91.180501</doi></addata></record>
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subjects	Asymptotic properties Condensed matter Fluctuation Iron Neutron scattering Parents Phases Spectra
title	Strong ( π , 0 ) spin fluctuations in β − FeSe observed by neutron spectroscopy
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