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Field-induced quantum critical point in CeCoIn₅

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arxiv cond-mat/0304497 v1 pith:DFZ67KNQ submitted 2003-04-22 cond-mat.supr-con cond-mat.str-el

Field-induced quantum critical point in CeCoIn₅

Johnpierre Paglione , M.A. Tanatar , D.G. Hawthorn , Etienne Boaknin , R.W. Hill , F. Ronning , M. Sutherland , Louis Taillefer
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C. Petrovic P. C. Canfield
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classification cond-mat.supr-con cond-mat.str-el
keywords criticalfieldbehaviorcecoindependencefield-inducedliquidpoint
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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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