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Anomalous Low Temperature States in CeNi2Ge2

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arxiv cond-mat/9812133 v1 pith:XLH2B6LA submitted 1998-12-08 cond-mat.str-el cond-mat.supr-con

Anomalous Low Temperature States in CeNi2Ge2

F. M. Grosche , P. Agarwal , S. R. Julian , N. J. Wilson , R. K. W. Haselwimmer , S. J. S. Lister , N. D. Mathur , F. V. Carter
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S. S. Saxena G. G. Lonzarich (Cavendish Laboratory Cambridge UK)
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classification cond-mat.str-el cond-mat.supr-con
keywords ceni2ge2highpressuretemperatureanomalousresistivityambientanomalies
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Ambient pressure studies on high purity single crystals of the stoichiometric 4f-electron metal CeNi2Ge2 reveal anomalous low temperature forms of the resistivity which challenge our understanding of the metallic state. Comparisons are made with the isostructural and isoelectronic compound CePd2Si2 near the border of magnetism at high pressure, and possible reasons for this novel non-Fermi liquid form of the resistivity are discussed. Phase diagrams of further anomalies are presented, which involve a loss of resistance at low temperature in some samples of CeNi2Ge2 and unexpected high pressure phases.

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