Effect of pressure cycling on iron: Signatures of an electronic instability and unconventional superconductivity

Article Article scientifique Article Effect of pressure cycling on iron: Signatures of an electronic instability and unconventional superconductivity eng 2013 author Yadav Chadr Shekhar 785270 author Seyfarth Gabriel 699438 author Pedrazzini P. author Wilhelm Heribert 114493 author Cerny Radovan 28214 author Jaccard Didier 26363 10.1103/PhysRevB.88.054110 1098-0121 High pressure electrical resistivity and x-ray diffraction experiments have been performed on Fe single crystals. The crystallographic investigation provides direct evidence that in the martensitic bcc→hcp transition at 14 GPa the {110}bcc become the {002}hcp directions. During a pressure cycle, resistivity shows a broad hysteresis of 6.5 GPa, whereas superconductivity, observed between 13 and 31 GPa, remains unaffected. Upon increasing pressure an electronic instability, probably a quantum critical point, is observed at around 19 GPa and, close to this pressure, the superconducting Tc and the isothermal resistivity (0<300 K) attain maximum values. In the superconducting pressure domain, the exponent n=5/3 of the temperature power law of resistivity and its prefactor, which mimics Tc, indicate that ferromagnetic fluctuations may provide the glue for the Cooper pairs, yielding unconventional superconductivity. Dewey 500.2 33 Département de physique de la matière quantique 131 false 806 Groupe Cerny Physical review. B, Condensed matter and materials physics 88 5 e50f7742-ac06-4833-af77-dbd979649fdf Article (Published version) Public Cerny3.pdf 669802 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Effect of pressure cycling on iron: Signatures of an electronic instability and unconventional superconductivity	Physical review. B, Condensed matter and materials physics			2013	639	384

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Yadav, Chadr Shekhar