Inhomogeneous superconducting state in the overdoped regime of La2−xSrxCuO4: Comparison with the superconducting state of NbSe2
Inhomogeneous superconducting state in the overdoped regime of La2−xSrxCuO4: Comparison with the superconducting state of NbSe2
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La2−xSrxCuO4 过掺杂区域的非均匀超导态：与 NbSe2 超导态的比较
DOI：
10.1016/j.jpcs.2008.06.094
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发表时间：
2008
影响因子：
4
通讯作者：
Y. Koike
中科院分区：
文献类型：
--
作者：
Y. Tanabe;T. Adachi;K. Omori;Hidetaka Sato;T. Noji;Takahiko Sasaki;Norio Kobayashi;Y. Koike
我们测量了NbSe 2单晶的磁化率χ与T的温度关系，以及磁化强度M与H的关系曲线，以比较La2− xSrxCuO 4（LSCO）过掺杂体系中的超导（SC）态与层状常规超导体NbSe 2的SC态。虽然在中等磁场中的χ对T的平台和所谓的M对H的第二峰，这是由于涡旋钉扎的显着增强，已经在LSCO的过掺杂制度中观察到，这些行为在NbSe 2中没有观察到。目前的研究结果表明，在过掺杂的LSCO的微观相分离到SC和正常状态的区域发生的一个特征是涡旋钉扎的显著增强。
We have measured the temperature dependence of the magnetic susceptibility, χ vs. T, and the magnetization curve, M vs. H, for NbSe2single crystals, in order to compare the superconducting (SC) state in the overdoped regime of La2−xSrxCuO4(LSCO) with the SC state of the layered conventional superconductor NbSe2. While a plateau in χ vs. T in a moderate magnetic field and a so-called second peak in M vs. H, which is due to the marked enhancement of vortex pinning, have been observed in the overdoped regime of LSCO, these behaviors have not been observed in NbSe2. The present results indicate that the anomalously marked enhancement of vortex pinning is a characteristic feature in the overdoped LSCO where a microscopic phase separation into SC and normal-state regions takes place.