Field-induced quantum critical point in CeCoIn_5

Details Field-induced quantum critical point in CeCoIn_5 Field-induced quantum critical point in CeCoIn_5

2003-04-22

arxiv.org/abs/cond-mat/0304497v1

Physics

Condensed Matter

Superconductivity

2 pages, 2 figures, submitted to M2S-Rio 2003 Proceedings

Scientific paper

10.1016/j.physc.2004.03.120

The resistivity of CeCoIn_5 was measured down to 20 mK in magnetic fields of up to 16 T. With increasing field, we observe a suppression of the non-Fermi liquid behavior, rho~T, and the development of a Fermi liquid state, with its characteristic rho=rho_0+AT^2 dependence. The field dependence of the T^2 coefficient shows critical behavior with an exponent of ~4/3. This is evidence for a new field-induced quantum critical point, occuring in this case at a critical field which coincides with the superconducting upper critical field H_c2.

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