Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 18: PhD symposium of the Division of Magnetism and the jDPG 2015: Quantum Phase Transitions: Emergent phenomena beyond elementary excitations

MA 18.8: Talk

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

Quantum criticality in frustrated CePd_1−xNi_xAl — •Akito Sakai¹, Stefan Lucas², Veronika Fritsch^1,3, Philipp Gegenwart¹, Oliver Stockert², and Hilbert v. Löhneysen³ — ¹Universität 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 T_N = 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 CePd_1−xNi_xAl 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).