Thermodynamics of the low-temperature structural transition in rare-earth-doped La2-xSrxCuO4

Article

关键词: SPIN FLUCTUATIONS;    SUPERCONDUCTING LA2-XSRXCUO4;    CUPRATE SUPERCONDUCTORS;    STRIPE CORRELATIONS;    HOLES;    LA1.48ND0.4SR0.12CUO4;    DYNAMICS;    ORDER;   

DOI  :  10.1103/PhysRevB.62.3704

来源: SCIE

【 摘 要 】

The Sr concentration dependence of the structural transition from the orthorhombic into the tetragonal low-temperature phase in rare-earth-doped (R=Nd,Eu) La2-x-ySrxRyCuO4 has been studied in detail. Independently of the rare earth concentration the transition temperature is strongly reduced at x similar to 0.05. We give a qualitative argument that the effect can be attributed to the Coulomb repulsion between doped carriers. We find the enthalpy jump at the low-temperature transition to scale transition temperature between the high-temperature tetragonal and the orthorhombic phase. This effect can be understood in terms of a Landau expansion.

【 授权许可】

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