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TT: Fachverband Tiefe Temperaturen

TT 17: Heavy Fermions

TT 17.10: Vortrag

Mittwoch, 28. März 2007, 16:30–16:45, H18

Pressure Dependence of The Néel in CeRhIn_5−xSn_x Studiedby Thermal Expansion — •J. Guido Donath¹, Philipp Gegenwart^1,3, Eric D. Bauer², John L. Sarrao², and Frank Steglich¹ — ¹Max-Planck-Institute for Chemical Physics of Solids, 01187 Dresden, Germany — ²Los Alamos National Laboratory, Los Alamos, New Mexico, 87545 USA — ³I. Physikalisches Institut, Universitaet Goettingen, Friedrich-Hund-Platz 1, 37077 Goettingen, Germany

We present low-temperature thermal expansion measurements on the Sn-substituted heavy fermion antiferromagnet CeRhIn_5−xSn_x for 0≤ x≤ 0.48 in which T_N(x) is linearly suppressed from 3.8 K at x=0 to zero at x_c≈ 0.4. The application of the Ehrenfest relation allows to calculate the initial uniaxial and hydrostatic pressure dependences dT_N/dP at various x. The observed non-linear variation with x is interpreted in terms of the Doniach diagram by an increase of the 4f-conduction electron hybridization induced by Sn-doping. As no traces of superconductivity are observed close to x_c, this system is ideally suited for the study of the magnetic quantum critical point.