Unconventional upper- and lower-critical fields and normal-state magnetic susceptibility of the superconducting compound Na 0.35 CoO 2 ⋅ 1.3 H 2 O
Unconventional upper- and lower-critical fields and normal-state magnetic susceptibility of the superconducting compound Na 0.35 CoO 2 ⋅ 1.3 H 2 O
复制标题
超导化合物Na 0.35 CoO 2 ⋅ 1.3 H 2 O的非常规上下临界场及常态磁化率
DOI：
10.1103/physrevb.68.132507
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发表时间：
2003
影响因子：
3.7
通讯作者：
E. Takayama
中科院分区：
文献类型：
--
作者：
H. Sakurai;K. Takada;S. Yoshii;T. Sasaki;K. Kindo;E. Takayama
层状超导体na0的磁性能。2。对1.3 h2o进行了研究。根据磁化强度的温度依赖性和场依赖性，估计超导转变温度为T C =4.6 K, H C 2 (0)=61.0 T, H C 1 (0)=28.1 Oe。这些值给出了非常不寻常的现象参数，即相干长度，穿透深度和金兹堡-朗道参数分别为Β=2.32 nm, λ=5.68×10 2 nm和κ≡λ/Β =244，表明超导的非常规性质。此外，还报道了T C以上的磁化率和高达54 T的磁化曲线。
Magnetic properties of the layered superconductor, Na 0 . 3 5 CoO 2 . 1.3H 2 O have been investigated. From the temperature dependence and field dependence of the magnetization, the superconducting transition temperature, aswell as upper- and lower-critical fields have been estimated to be T C =4.6 K, H C 2 (0)=61.0 T and H C 1 (0)=28.1 Oe, respectively. These values give quite unusual phenomenological parameters, i.e., coherent length, penetration depth and Ginzburg-Landau parameter of Β=2.32 nm, λ=5.68×10 2 nm, and κ≡λ/Β =244, respectively, suggesting an unconventional nature of superconductivity. Additionally, the magnetic susceptibility above T C and the magnetization curve up to 54 T are also reported.