Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena
TT 6.70: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Quantum Criticality in CeMIn5-Systems Studied by Low-Temperature Thermal Expansion — •Jan 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
CeMIn5-115-systems are of tremendous current interest since they are ideal to study the interplay of unconventional superconductivity (SC), long-range magnetic order and non-Fermi liquid behavior (nFL).
In this work, we will present low temperature thermal expansion measurements of CeIrIn5, a heavy fermion superconductor at ambient pressure. By applying high magnetic fields B>12 T, SC is suppressed and nFL behavior develops, which is believed to be connected to a metamagnetic quantum critical point (QCP) at B≈ 25 T [1].
Thermal expansion is a powerful tool to analyse quantum critical behavior and make robust statements about the nature of the QCP. We performed measurements in magnetic fields up to B=17.5 T and temperatures 50 mK ≤ T≤ 4 K. We will analyse the temperature dependences of our results and compare them with theoretical predictions [2] and other representatives of the 115-family (M=Co, Rh).
[1] Capan et al., PRB 70 180502 (2004).
[2] Zhu et al., PRL 91 066404 (2003).