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TT: Fachverband Tiefe Temperaturen

TT 35: PhD Symposium: Quantum Phase Transitions: Emergent Phenomena beyond Elementary Excitations (organized by MA, jDPG)

TT 35.8: Talk

Tuesday, March 17, 2015, 14:30–14:45, EB 301

Quantum criticality in frustrated CePd1−xNixAl — •Akito Sakai1, Stefan Lucas2, Veronika Fritsch1,3, Philipp Gegenwart1, Oliver Stockert2, and Hilbert v. Löhneysen31Universität Augsburg, Institut für Physik, Elektronische Korrelationen und Magnetismus, Germany — 2Max-Planck-Institut für chemische Physik fester Stoffe, Dresden, Germany — 3Karlsruher Institut für Technologie, Physikalisches Institut, Germany

Various interesting behaviors such as non-Fermi liquid and unconventional superconductivity have been observed in the vicinity of quantum critical points (QCPs), which are induced by the competition between Kondo effect and RKKY interaction. Another route to achieve the QCP is geometric frustration. CePdAl is one of the candidates of such quantum critical frustrated systems [1,2]. In addition to the heavy fermion behaviors, a partial antiferromagnetic ordering is revealed below TN = 2.7 K, where one third of the Ce moments in the distorted kagomé lattice are still paramagnetic [1]. In this presentation, we discuss the possible QCP in CePd1−xNixAl revealed by the specific heat measurement in the dilution refrigerator.
[1] A. Dönni et al., J. Phys.: Condens. Matter 8, 11213 (1996).
[2] V. Fritsch et al., Phys. Rev. B 89, 054416 (2014).

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