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Spin and valence-fluctuation mediated superconductivity in pressurised Fe and CeCu2(Si/Ge)2

Published in Physica B: Condensed Matter. 2005, vol. 359-361, p. 333-340
Abstract We review the evidence supporting valence-fluctuation-mediated superconductivity in CeCu 2Si 2 and CeCu 2Ge 2, where Tc reaches 2.4 K at high pressure. In these systems the valence and magnetic critical points, at pv and pc, respectively, are well separated. Characteristic signatures associated with both are distinct. In contrast, the valence and spin fluctuation regions appear much closer in most Ce-based compounds. Concerning d-transition metals, superconductivity in pure iron emerges in the pressure window 15-30 GPa with the onset of Tc up to almost 3 K. All relevant observations point to unconventional superconductivity, likely mediated by ferromagnetic spin fluctuations
Keywords High PressureSuperconducting mechanismTransport PropertiesIronCeCu2Si2
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Research group Groupe Triscone
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JACCARD, Didier, HOLMES, Alexander. Spin and valence-fluctuation mediated superconductivity in pressurised Fe and CeCu2(Si/Ge)2. In: Physica B: Condensed Matter, 2005, vol. 359-361, p. 333-340. doi: 10.1016/j.physb.2005.01.056 https://archive-ouverte.unige.ch/unige:35731

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Deposited on : 2014-04-15

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