Transport properties and low temperature structural phase transition around x=0.125 in La2-x-yREySrxCuO4 (RENd, Sm, Gd, Tb)

T. Suzuki, M. Sera, T. Fukase

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Abstract

In La1.9-itxGd0.1SrxCuO4, a prominent change of the thermoelectric power S below ∼80K is observed in a narrow region of x around 0.12 although the structural phase transition to the tetragonal low-temperature (TLT) phase is observed at ∼ 115K in a wide region of x. These results suggest that the anomalous behaviors of the transport properties below ∼80K are responsible for the change of the electronic state itself. In La1.875-yGdySr0.125CuO4, Tuittdβ, which is the structural phase transition temperature to the TLT pahse, increases with increasing y. The temperature where S begins to decrease rapidly is close to Tu in y≤0.04. In y≥0.05, a prominent change of S is observed below a lower temperature than Tu and an obvious sign reversal of S appears appears at ∼40K. These results indicate that the change of the electronic state is enhanced in the TLT phase.

Original languageEnglish
Pages (from-to)1315-1316
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume235-240
Issue numberPART 2
DOIs
Publication statusPublished - 1994 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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