info:eu-repo/semantics/article
Effect of pressure cycling on iron: Signatures of an electronic instability and unconventional superconductivity
Fecha
2013-08Registro en:
Yadav, C. S.; Seyfarth, G.; Pedrazzini, Pablo; Wilhelm, H.; Černý, R.; et al.; Effect of pressure cycling on iron: Signatures of an electronic instability and unconventional superconductivity; American Physical Society; Physical Review B: Condensed Matter And Materials Physics; 88; 5; 8-2013; 1-7; 54110
1098-0121
Autor
Yadav, C. S.
Seyfarth, G.
Pedrazzini, Pablo
Wilhelm, H.
Černý, R.
Jaccard, D.
Resumen
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 <T < 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.