Enhanced two-dimensional behavior of metastable T '-La2CuO4, the parent compound of electron-doped cuprate superconductors

Article

关键词: SINGLE-CRYSTALS;    OXIDE SUPERCONDUCTORS;    NEUTRON-DIFFRACTION;    MAGNETIC ORDER;    PHASE-DIAGRAMS;    SPIN DYNAMICS;    LA2CUO4;    ND2-XCEXCUO4;    RELAXATION;    ND2CUO4;   

DOI  :  10.1103/PhysRevB.82.180508

来源: SCIE

【 摘 要 】

We synthesized crystalline bulk samples of lanthanum cuprate in the metastable T' phase using cesium hydroxide flux. Its crystal structure was determined as space group I4/mmm, no. 139, a = 401.02 pm, c = 1252.66 pm. Muon spin rotation reveals a gradual slowing down of magnetic fluctuations below T-N1 approximate to 200 K, and static magnetic order below T-N2 = 115 K, in sharp contrast to La2CuO4 in the T structure where T-N1 approximate to T-N2 approximate to 300 K. Our result shows that the strikingly different magnetic behavior of the two parent compounds has its origin in the two crystal structure modifications. In addition, we find that T'-La2CuO4 has strongly reduced magnetic interactions compared to the other T' materials Nd2CuO4 and Pr2CuO4, where Nd3+ and Pr3+ are magnetic ions in contrast to the nonmagnetic La3+.

【 授权许可】

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