NON-CENTROSYMMETRIC HEAVY FERMION SUPERCONDUCTIVITY IN CeCoGe3
NON-CENTROSYMMETRIC HEAVY FERMION SUPERCONDUCTIVITY IN CeCoGe3
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DOI：
10.1142/s0217979207044287
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发表时间：
2007-07
影响因子：
1.7
通讯作者：
R. Settai;Y. Okuda;I. Sugitani;Y. Ōnuki;T. Matsuda;Y. Haga;H. Harima
中科院分区：
文献类型：
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作者：
R. Settai;Y. Okuda;I. Sugitani;Y. Ōnuki;T. Matsuda;Y. Haga;H. Harima
我们测量了反铁磁体CeCoGe_3在压力下的电阻率。在环境压力下的Neel温度TN 1 = 21 K，随着压力的增加而单调下降，并且在约5.5 GPa处变为零。在4.3GPa以上出现超导现象，超导转变温度Tsc = 0.72K，在5.6GPa下有很大的上临界场Hc 2（0）= 7 T。如CePt 3Si、CeRhSi 3和CeIrSi 3中，大的上临界场Hc 2（0）= 7 T超过泡利极限场Hp（Δ 1.86Tsc）= 1.3T。在5.6GPa下，在Tsc，-dHc 2/dT = 18 T/K处的Hc 2的大斜率表明CeCoGe 3中存在重费米子超导电性。
We measured the electrical resistivity under pressure for an antiferromagnet CeCoGe3 without inversion symmetry in the tetragonal crystal structure. The Neel temperature TN1 = 21 K at ambient pressure decreases monotonically with increasing pressure, and becomes zero at about 5.5 GPa. Superconductivity appears above 4.3 GPa, with a superconduting transition temperature Tsc = 0.72 K and a large upper critical field Hc2(0) = 7 T at 5.6 GPa. The large upper critical field Hc2(0)= 7 T exceeds the Pauli limitting field Hp (≃ 1.86Tsc)=1.3 T as in CePt3Si, CeRhSi3 and CeIrSi3. The large slope of Hc2 at Tsc, -dHc2/dT = 18T/K, at 5.6 GPa indicates the heavy-fermion superconductivity in CeCoGe3.