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Cu site substitution effect on the low temperature specific heat in La2−xSrxCuO4

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/0921-4534(94)92111-3
Disciplines
  • Physics

Abstract

Abstract Substitution effects by M(M=Zn, Ni, Ga, and Co) for Cu site in La 2−xSr xCu 1−yM yO 4(0.1 ≤ x ≤ 0.23) on the low temperature specific heat have been investigated. The T-linear specific heat coefficient γ increases from a small value due to the superconductivity with y up to y c, above which the superconductivity disappears and the variation of γ becomes smaller for y > y c. The γ values of Zn substituted samples are much larger than those of the Ni and other substituted samples. These results indicate that the low temperature electronic state is largely modified by the Zn substitution while the modification by the Ni substitution or the others is small, which is consistent with the different Cu site substitution effect on the Hall coefficient and the electrical resistivity at high temperatures.

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