TY - JOUR
T1 - Inhomogeneous superconducting state in the overdoped regime of La2-xSrxCuO4
T2 - Comparison with the superconducting state of NbSe2
AU - Tanabe, Y.
AU - Adachi, T.
AU - Omori, K.
AU - Sato, H.
AU - Noji, T.
AU - Sasaki, T.
AU - Kobayashi, N.
AU - Koike, Y.
N1 - Funding Information:
We are indebted to K. Takada and M. Ishikuro for their help in the ICP-OES analysis. The EPMA analysis was supported by Y. Murakami in the Advanced Research Center of Metallic Glasses, Institute for Materials Research (IMR), Tohoku University and K. Kudo in IMR, Tohoku University. Fruitful discussions with T. Nishizaki and S. Awaji are gratefully acknowledged. The χ measurements were carried out at the Center for Low Temperature Science, Tohoku University. This work was supported by the Iketani Science and Technology Foundation and also by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
PY - 2008/12
Y1 - 2008/12
N2 - We have measured the temperature dependence of the magnetic susceptibility, χ vs. T, and the magnetization curve, M vs. H, for NbSe2 single 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.
AB - We have measured the temperature dependence of the magnetic susceptibility, χ vs. T, and the magnetization curve, M vs. H, for NbSe2 single 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.
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U2 - 10.1016/j.jpcs.2008.06.094
DO - 10.1016/j.jpcs.2008.06.094
M3 - Article
AN - SCOPUS:57049100335
VL - 69
SP - 3217
EP - 3220
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
IS - 12
ER -