Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

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 Huang^1,2,3, Akito Sakai⁴, Sarah Woitschach², Elizabeth L. Green⁵, Sebastian Kuntz¹, J. Wosnitza⁵, Veronika Fritsch⁴, Philipp Gegenwart⁴, Oliver Stockert², and Hilbert von Löhneysen^1,3 — 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.