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TT: Fachverband Tiefe Temperaturen
TT 60: Correlated Electrons: f-Electron Systems
TT 60.12: Vortrag
Donnerstag, 23. März 2017, 12:30–12:45, HSZ 201
Stress - Temperature Phase Diagram of Antiferromagnetic order in CeAuSb2 Under Uniaxial Pressure — •Joonbum Park1,2, Hideaki Sakai3, Andrew P. Mackenzie1,4, and Clifford W. Hicks1 — 1Max Planck Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, 01187 Dresden, Germany — 2Max Planck POSTECH Center for Complex Phase Materials, Max Planck POSTECH/Korea Research Initiative (MPK), Gyeongbuk 376-73, Korea — 3Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan — 4Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
We present results of the electrical transport measurements under uniaxial pressure on the antiferromagnet CeAuSb2. In the unstrained system, the resistivity along [100] shows a sharp drop at the Néel temperature (TN ≈ 6.5 K), suggesting a first order transition. With compression along [100] by ≈ 0.3 %, the transition splits into two continuous transitions, at temperatures T1 and T2. T1 is fully suppressed at a compression of ≈ 0.6 %, and in pressure ramps at low temperature this transition is a sharp cusp with hysteresis, indicating a first-order transition. T2, on the other hand, rises continuously with increasing compression, reaching 9 K at 1.2 % compression. At present, the nature of the strain-induced phase between T1 and T2 is not clear.