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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.16: Poster

Thursday, March 17, 2011, 10:00–13:00, P1

Phase diagram of CePt₃B_1−xSi_x — •Daniela Rauch¹, Matthias Bleckmann¹, Stefan Süllow¹, Moo Sung Kim², Meigan Aronson^2,3, and Ernst Bauer⁴ — ¹TU Braunschweig, Institute for Physics of Condensed Matter, Braunschweig, Germany — ²Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, New York, USA — ³Stony Brook University, Department of Physics and Astronomy, New York, USA — ⁴TU Vienna, Institute of Solid State Physics, Vienna, Austria

The non-centro symmetric system CePt₃Si shows an unconventional heavy-fermion superconducting ground state (T_c= 0.75 K), in coexistence with an antiferromagnetic phase below T_N=2.2 K. In contrast, CePt₃B exhibits a complex magnetically ordered state at low temperatures, with an antiferromagnetic phase below T_N=8 K and a second weakly ferromagnetic transition below T_C≈ 5 K.

Here we report a study of the magnetic phase diagram of the alloying series CePt₃B_1−xSi_x. From our investigation we find the antiferromagnetism of CePt₃B to transform into the analagous phase of CePt₃Si. In contrast, we observe a supression of the ferromagnetically ordered phase above a critical Si concentration x_c≈ 0.5. We discuss the relationship of superconductivity and magnetism of the alloying series.