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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 CePd_1−xNi_xAl — •Sebastian Kuntz¹, Kai Grube¹, Chien-Lung Huang², Veronika Fritsch³, and Hilbert von Löhneysen^1,4 — 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 T_N = 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 T_N. 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).