Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Quantum-Critical Phenomena I
TT 50.9: Vortrag
Mittwoch, 14. März 2018, 12:00–12:15, H 3005
Pressure dependent entropy of the partially frustrated heavy-fermion system CePd1−xNixAl — •Sebastian Kuntz1, Kai Grube1, Chien-Lung Huang2, Veronika Fritsch3, and Hilbert von Löhneysen1,4 — 1Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76021 Karlsruhe, Germany — 2Department of Physics and Astronomy, Rice University, Houston, Texas 77005, United States — 3Experimentalphysik VI, Elektronische Korrelationen und Magnetismus, Universität Augsburg, 86159 Augsburg, Germany — 4Physikalisches Institut, Karlsruher Institut für Technologie, 76049 Karlsruhe, Germany
In CePdAl one third of the Ce moments are geometrically frustrated and do not participate in the antiferromagnetic long-range order below TN = 2.7 K. By replacing Pd with isoelectronic, but smaller Ni atoms, the magnetic order can be suppressed at a Ni concentration of x = 0.14 [1]. We measured the thermal expansion of x = 0, 0.05 and 0.14 single crystals in magnetic fields up to B = 14 T to obtain the uniaxial pressure dependences of the entropy S(T) and the ordering temperature TN. The results will be compared with magnetization measurements of CePdAl under hydrostatic pressure. The impact of external and chemical pressure on the geometric frustration and the Kondo effect will be discussed.
A. Sakai et al., Phys. Rev. B 94, 22045(R) (2016).