Regensburg 2007 – wissenschaftliches Programm
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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 CeRhIn5−xSnx Studiedby Thermal Expansion — •J. Guido Donath1, Philipp Gegenwart1,3, 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 CeRhIn5−xSnx for 0≤ x≤ 0.48 in which TN(x) is linearly suppressed from 3.8 K at x=0 to zero at xc≈ 0.4. The application of the Ehrenfest relation allows to calculate the initial uniaxial and hydrostatic pressure dependences dTN/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 xc, this system is ideally suited for the study of the magnetic quantum critical point.