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Title

Superconductivity, Upper Critical Field and Anomalous Normal State in CePd2Si2 Near the Quantum Critical Point

Authors
Steep, E.
Braithwaite, D.
Brison, J.-P.
Flouquet, J.
Published in Journal of Low Temperature Physics. 2001, vol. 122, no. 5/6, p. 591-604
Abstract We report resistivity measurements performed on a high quality single crystal of CePd2Si2 under hydrostatic pressure. At ambient pressure the de Haas–van Alphen effect has been also studied. Two different frequencies with weak angular dependence were detected with magnetic field lying in the basal plane, while another frequency was found with magnetic field parallel to the tetragonal c axis. Near the critical pressure, Pc∼27 kbar, where the antiferromagnetic transition vanishes, the normal state resistivity does not follow the usual Fermi-liquid (FL) behavior and is described by a T1.3 law, while just below Pc, the resistivity shows clearly separated spin wave and electron–electron contributions. At Pc, the FL form of ρ(T) is not restored even at magnetic field up to 6T. The first appearance of superconductivity is observed at P=19 kbar, and the critical temperature increases with pressure up to 27 kbar. The analysis of the upper critical field at Pc shows that the superconducting state is well described by a weak coupling, clean limit model with a slightly anisotropic orbital limit and a strongly anisotropic paramagnetic one.
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SHEIKIN, Ilya et al. Superconductivity, Upper Critical Field and Anomalous Normal State in CePd2Si2 Near the Quantum Critical Point. In: Journal of Low Temperature Physics, 2001, vol. 122, n° 5/6, p. 591-604. https://archive-ouverte.unige.ch/unige:35749

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Deposited on : 2014-04-15

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