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Author Pedrazzini, P.; Wilhelm, H.; Jaccard, D.; Jarlborg, T.; Schmidt, M.; Hanfland, M.; Akselrud, L.; Yuan, H. Q.; Schwarz, U.; Grin, Yu.; Steglich, F.
Title Metallic State in Cubic FeGe Beyond Its Quantum Phase Transition Type Journal Article
Year 2007 Publication (down) Physical Review Letters Abbreviated Journal Phys. Rev. Lett.
Volume 98 Issue Pages 047204
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Abstract We report on results of electrical resistivity and structural investigations on the cubic modification of FeGe under high pressure. The long-wavelength helical order (TC=280K) is suppressed at a critical pressure pc≈19GPa. An anomaly at TX(p) and strong deviations from a Fermi-liquid behavior in a wide pressure range above pc suggest that the suppression of TC disagrees with the standard notion of a quantum critical phase transition. The metallic ground state persisting at high pressure can be described by band-structure calculations if zero-point motion is included. The shortest FeGe interatomic distance display discontinuous changes in the pressure dependence close to the TC(p) phase line.
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Call Number BT @ pedrazp @ Serial 468
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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 (down) Physical Review B Abbreviated Journal Phys. Rev. B
Volume 88 Issue 5 Pages 054110-7
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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.
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Publisher American Physical Society Place of Publication Editor
Language English Summary Language Original Title
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Call Number BT @ pedrazp @ Serial 658
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Author Rus, T.; Wilhelm, H.; Stockert, O.; Luhmann, T.; Caroca-Canales, N.; Sereni, J.G.; Geibel, C.; Steglich, F.
Title Specific heat of CeIn3-xSnx single crystals in the vicinity of the quantum critical point Type Journal Article
Year 2005 Publication (down) PHYSICA B-CONDENSED MATTER Abbreviated Journal
Volume 359-361 Issue Pages 62-64
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Abstract We report on results of low-temperature specific heat experiments on single crystals of the cubic alloy CeIn3-xSnx (x = 0.55,0.60, 0.65, and 0.80). The measurements support three-dimensional critical spin fluctuations in the vicinity of the magnetic instability, i.e. for x(c) approximate to 0.67, where the antiferromagnetic order vanishes. (c) 2005 Elsevier B.V. All rights reserved.
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ISSN 0921-4526 ISBN Medium
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Notes ISI:000229654400019 Approved no
Call Number BT @ hernan @ Serial 60
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