Artículo
Effect of pressure cycling on iron: Signatures of an electronic instability and unconventional superconductivity
Fecha de publicación:
08/2013
Editorial:
American Physical Society
Revista:
Physical Review B: Condensed Matter And Materials Physics
ISSN:
1098-0121
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
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.
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
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
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