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

Publication date2013
Abstract

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.

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Citation (ISO format)
YADAV, Chadr Shekhar et al. Effect of pressure cycling on iron: Signatures of an electronic instability and unconventional superconductivity. In: Physical review. B, Condensed matter and materials physics, 2013, vol. 88, n° 5. doi: 10.1103/PhysRevB.88.054110
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ISSN of the journal1098-0121
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