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Rus, T.; Wilhelm, H.; Stockert, O.; Luhmann, T.; Caroca-Canales, N.; Sereni, J.G.; Geibel, C.; Steglich, F. |
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Specific heat of CeIn3-xSnx single crystals in the vicinity of the quantum critical point |
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2005 |
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PHYSICA B-CONDENSED MATTER |
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359-361 |
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62-64 |
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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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0921-4526 |
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ISI:000229654400019 |
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BT @ hernan @ |
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60 |
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Pedrazzini, P.; Wilhelm, H.; Jaccard, D.; Jarlborg, T.; Schmidt, M.; Hanfland, M.; Akselrud, L.; Yuan, H. Q.; Schwarz, U.; Grin, Yu.; Steglich, F. |
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Title |
Metallic State in Cubic FeGe Beyond Its Quantum Phase Transition |
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Journal Article |
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2007 |
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Physical Review Letters |
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Phys. Rev. Lett. |
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98 |
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047204 |
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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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468 |
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Yadav, C.S.; Seyfarth, G.; Pedrazzini, P.; Wilhelm, H.; Cerný, R.; Jaccard, D. |
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Effect of pressure cycling on Iron: Signatures of an electronic instability and unconventional superconductivity |
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2013 |
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Physical Review B |
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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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