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TT: Fachverband Tiefe Temperaturen

TT 35: Correlated Electrons: Quantum-Critical Phenomena - Experiment I

TT 35.11: Talk

Tuesday, April 1, 2014, 12:15–12:30, HSZ 204

transport and torque magnetometry measurements on CeAuSb2 — •Lishan Zhao — University of St Andrews, St Andrews, Fife, UK

The tetragonal crystal CeAuSb2 has a layered structure and orders antiferromagnetically at T 6K. Under a c-axis magnetic field, the Neel temperature is gradually suppressed to zero at a possible field-tuned quantum critical point at about 6 T. Within this antiferromagnetic phase, between the QCP and about 2.8 T, there is an additional, novel phase[1]. We report transport measurements on purest-to-date single crystals of CeAuSb2, in fields of up to 15 T and from room temperature down to 100 mK. We also report torque magnetometry measurements. Unlike a recent report[2], we find single, sharp transitions into the novel phase. We discuss the nature of the novel phase.
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K.-A. Lorenzer et al., Phys. Status Solidi B 250, 464 (2013)