Non-Fermi liquid effects close to a QCP in CeIn3-xSnx.

J. CUSTERS; T. CICHOREK; P. GEGENWART; N. CAROCA-CANALES; O. STOCKERT; C. GEIBEL; F. STEGLICH; P. PEDRAZZINI; J.G. SERENI

ACTA PHYSICA POLONICA B

Año: 2003 vol. 34 p. 379 - 382

0587-4254

Resistivity and specific heat measurements at low temperatures on CeIn3-xSnx samples with concentrations x=0.6, 0.65 and 0.7 demonstrate that with increasing Sn-alloying, the antiferromagnetic ordering temperature decreases continuously down to T=0K and disappears at a quantum critical point. We observe non-Fermi liquid (NFL) behavior in the resistivity and the specific heat, however the temperature dependencies are different from the predictions for a spin density wave (SDW) scenario. The resistivity at the critical point shows e.g., a linear temperature dependence, as expected for two dimensional fluctuations, which however can be excluded in the cubic structure of CeIn3-xSnx.