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

DOI: 10.1103/PhysRevB.88.054110 DOI Help

Authors: C. S. Yadav (University of Geneva) , G. Seyfarth (University of Geneva) , P. Pedrazzini (University of Geneva) , H. Wilhelm (Diamond Light Source) , R. Cerny (University of Geneva) , D. Jaccard (University of Geneva)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 88 (5)

State: Published (Approved)
Published: August 2013

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<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.

Subject Areas: Materials, Engineering, Physics

Instruments: I15-Extreme Conditions

Added On: 29/08/2013 13:09

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