Format

Send to

Choose Destination
Phys Rev Lett. 2003 Dec 12;91(24):246405. Epub 2003 Dec 12.

Field-induced quantum critical point in CeCoIn5.

Author information

1
Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7. paglione@physics.utoronto.ca

Abstract

The resistivity of the heavy-fermion superconductor CeCoIn5 was measured as a function of temperature, down to 25 mK and in magnetic fields of up to 16 T applied perpendicular to the basal plane. With increasing field, we observe a suppression of the non-Fermi liquid behavior, rho approximately T, and the development of a Fermi liquid state, with its characteristic rho=rho(0)+AT2 dependence. The field dependence of the T2 coefficient shows critical behavior with an exponent of 1.37. This is evidence for a field-induced quantum critical point (QCP), occurring at a critical field which coincides, within experimental accuracy, with the superconducting critical field H(c2). We discuss the relation of this field-tuned QCP to a change in the magnetic state, seen as a change in magnetoresistance from positive to negative, at a crossover line that has a common border with the superconducting region below approximately 1 K.

Supplemental Content

Full text links

Icon for American Physical Society
Loading ...
Support Center