Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena

TT 6.11: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

Antiferroquadrupolar phases in U(Pd_1-xPt_x)₃, x≤ 0.01 — •Markus Schäpers¹, Matthias Bleckmann¹, Dirk Schulze Grachtrup¹, Stefan Süllow¹, and Keith McEwen² — ¹Technsiche Universität Braunschweig, Braunschweig, Deutschland — ²University College London, London, England

The double hexagonal compound UPd₃ has been shown to undergo several successive phase transitions below 8 K. These low temperature phases are antiferroquadrupolar ordered ones with different AFQ order parameters. In-field measurements on UPd₃ reveal a complex response of these phases on magnetic fields, leading to a very rich magnetic phase diagram [1-3].

Here, for the first time we present resistivity measurements and a magnetic phase diagram for single crystalline lowly doped samples U(Pd_1-xPt_x)₃, x≤ 0.01, and compare these measurements to pure UPd₃. We find that doping leads to reduced ordering temperatures but leaves the underlying physics of the AFQ ordered phases unaffected

[1] Y. Tokiwa, K. Sugiyama, T. Takeuchi, M. Nakashima, R. Settai, Y. Inada, Y. Haga, E. Yamamoto, K. Kindo, H. Harima and Y. Onuki, J. Phys. Soc. Jpn. 70 (2001) 1731

[2] D. F. McMorrow, K. A. McEwen, U. Steigenberger, H. M. Rønnow and F. Yakhou, Phys. Rev. Lett. 87 (2001) 057201

[3] H. C. Walker, K. A. McEwen, D. F. McMorrow, S. B. Wilkins, F. Wastin, E. Colineau and D. Fort, Phys. Rev. Lett. 97 (2006) 137203