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Author Yadav, C.S.; Seyfarth, G.; Pedrazzini, P.; Wilhelm, H.; Cerný, R.; Jaccard, D.
Title Effect of pressure cycling on Iron: Signatures of an electronic instability and unconventional superconductivity Type Journal Article
Year 2013 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 88 Issue 5 Pages 054110-7
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 $bcc \rightarrow hcp$ transition at 14 GPa the $\lbrace 110\rbrace{bcc}$ become the $\lbrace 002\rbrace{hcp}$ 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 $T{c}$ 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 $T{c}$, indicate that ferromagnetic fluctuations may provide the glue for the Cooper pairs, yielding unconventional superconductivity.
Corporate Author Thesis
Publisher American Physical Society Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
Area Expedition Conference (up)
Notes Approved no
Call Number BT @ pedrazp @ Serial 658
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