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Seyfarth, G.; Jaccard, D.; Pedrazzini, P.; Krzton-Maziopa, A.; Pomjakushina, E.; Conder, K.; Shermadini, Z. |
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Pressure cycle of superconducting Cs0.8Fe2Se2 : A transport study |
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Journal Article |
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2011 |
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Solid State Communications |
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Solid State Commun. |
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151 |
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10 |
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747-750 |
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Fe; Se; chalcogenides; Superconductivity; High pressure; electrical resistivity |
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We report measurements of the temperature and pressure dependence of the electrical resistivity (Ï) of single-crystalline iron-based chalcogenide Cs0.8Fe2Se2. In this material, superconductivity with a transition temperature Tc~30K source develops from a normal state with extremely large resistivity. At ambient pressure, a large “hump†in the resistivity is observed around 200 K. Under pressure, the resistivity decreases by two orders of magnitude, concomitant with a sudden Tc suppression around pc~30K. Even at 9 GPa a metallic resistivity state is not recovered, and the Ï(T) “hump†is still detected. A comparison of the data measured upon increasing and decreasing the external pressure leads us to suggest that the superconductivity is not related to this hump. |
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604 |
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Yadav, C.S.; Seyfarth, G.; Pedrazzini, P.; Wilhelm, H.; Cerný, R.; Jaccard, D. |
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Title |
Effect of pressure cycling on Iron: Signatures of an electronic instability and unconventional superconductivity |
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Journal Article |
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2013 |
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Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
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88 |
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5 |
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054110-7 |
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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. |
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American Physical Society |
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English |
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BT @ pedrazp @ |
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658 |
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