Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Poster Session: Correlated Electrons 1
TT 19.11: Poster
Montag, 20. März 2017, 15:00–19:00, P2-EG
Evolution of the entropy in the magnetic phases of partially frustrated CePdAl — •Kai Grube1, Stefan Lucas2, Chien-Lung Huang1,2,3, Akito Sakai4, Sarah Woitschach2, Elizabeth L. Green5, Sebastian Kuntz1, J. Wosnitza5, Veronika Fritsch4, Philipp Gegenwart4, Oliver Stockert2, and Hilbert von Löhneysen1,3 — 1Institut für Festkörperphysik, Karlsruher Institut für Technologie, Germany — 2Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany — 3Physikalisches Institut, Karlsruher Institut für Technologie, Germany — 4Experimentalphysik VI, Center for Electronic Correlations and Magnetism, Augsburg University, Germany — 5Hochfeld-Magnetlabor Dresden (EMFL-HLD), Helmholtz-Zentrum Dresden-Rossendorf, Germany
In the heavy-fermion metal CePdAl long-range antiferromagnetic order coexists with geometric frustration of one third of the Ce moments. At low temperatures the Kondo effect tends to screen the frustrated moments. We use magnetic fields B to suppress the Kondo screening and studied the magnetic phase diagram and the evolution of the entropy with B employing thermodynamic probes. We estimate the frustration by introducing a definition of the frustration parameter based on the enhanced entropy, a fundamental feature of frustrated systems. In the field range where the Kondo screening is suppressed the liberated moments tend to destabilize the magnetic order and strongly enhance the frustration.