Soonbeom's First Paper Published in Phys. Rev. B

EPSL | 2012.06.20 10:47 | 조회 3295

Congratulation to Soonbeom for his firs publication to Physical Review B 85, 205145 (2012). Below is a brief summary:

 

Cerium-based compounds have attracted a lot of attention because they exhibit a variety of interesting phenomena, such as heavy fermion, magnetic, and unconventional superconducting states. Especially, magnetically ordered Ce compounds have been model systems for exploring the interplay between magnetism and superconductivity, where the ground state is determined by the balance between RKKY and Kondo interactions. Here, we report electrical resistivity and specific heat measurements of CeAuSb2, where the occupancy of the Au site is close to 99 %, T_N is 6.8 K, the highest reported so far, and the RRR is 14, indicating high quality of the measured crystals. Unlike previous work on a crystal with T_N=5.0 K, application of pressure does not reduce T_N to 0 K, but rather induces a new, complex magnetic phase at lower temperatures. A T^2 Fermi-liquid dependence of the electrical resistivity is observed to the highest measured pressure 5.5 GPa, but the T^2 resistivity coefficient and the residual resistivity monotonically increase, suggesting that a magnetic quantum critical point may exist at a higher pressure.

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