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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.7: Poster

Thursday, March 29, 2012, 15:00–19:00, Poster B

Annealing effects in the antiferroquadrupolar compound U(Pd1−xPtx)3 — •Dirk Schulze Grachtrup1, Kerstin Westkämper1, Markus Schäpers1,2, Matthias Bleckmann1,3, Stefan Süllow1, and Keith A. McEwen41Institut für Physik der Kondensierten Materie, TU Braunschweig, Braunschweig, Germany — 2Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Dresden, Germany — 3Wehrwissenschaftliches Institut für Werk- und Betriebsstoffe, Erding, Germany — 4University College London, London, United Kingdom

The double hexagonal compound UPd3 undergoes several successive phase transitions to antiferroquadrupolar (AFQ) ordered phases below 8 K. Measurements of UPd3 in magnetic fields reveal a complex response of these AFQ phases to the applied field, leading to a rich magnetic phase diagam [1-3].

Doping of UPd3 with Pt leads to a rapid suppression of the ordered phases in U(Pd1−xPtx)3. Recent studies of single crystalline U(Pd1−xPtx)3 in the regime x ≤ 0.01 revealed a strong reduction of the ordering temperatures with doping. At x=0.005 ordering temperatures are reduced to about one half compared to those of pure UPd3. For x=0.01 the AFQ order is almost completely suppressed. Here, we present the effects of annealing on specific heat and resitivity of single crystalline samples of U(Pd1−xPtx)3.
Y. Tokiwa et al., J. Phys. Soc. Jpn. 70 (2001) 1731
D. F. McMorrow et al., Phys. Rev. Lett. 87 (2001) 057201
H. C. Walker et al., Phys. Rev. Lett. 97 (2006) 137203

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