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TT: Fachverband Tiefe Temperaturen
TT 72: Correlated Electrons: Frustrated Magnets - General 2
TT 72.6: Vortrag
Donnerstag, 23. März 2017, 16:15–16:30, HSZ 204
Character of the Néel Transition of Triangular Antiferromagnet PdCrO2 — •Jack Bartlett1,2, Dan Sun1, Jhuma Sannigrahi1, Pallavi Kushwaha1, Andrew Mackenzie1,2, and Clifford Hicks1 — 1Max-Planck Institute for Chemical Physics of Solids, Nöthnitzerstr. 40, Dresden, 01187, Germany — 2Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom
The transition from paramagnetism to antiferromagnetism is usually second-order, but can be driven first-order through magnetoelastic coupling or fluctuation effects. In this talk, we present data on the antiferromagnetic transition of PdCrO2. This is a layered, triangular compound consisting of alternating sheets of highly conductive Pd and insulating, magnetic CrO2. The Cr spins are Heisenberg-like, and below TN∼38 K order into the the 120∘ Néel phase. Resistivity data on uniaxially-stressed PdCrO2 suggest that at zero stress the transition is weakly first-order, however on close inspection the transition appears to be a crossover. We discuss further using resistivity, thermal expansion, and susceptibility data.