One- and three-dimensional quantum phase transitions and anisotropy in Rb2Cu2Mo3O12

Article

关键词: ONE-DIMENSIONAL SYSTEM;    MAGNETIC-FIELD;    A(2)CU(2)MO(3)O(12);    PRESSURE;    CS;    RB;   

DOI  :  10.1103/PhysRevB.100.134427

来源: SCIE

【 摘 要 】

Single crystal samples of the frustrated quasi-one-dimensional quantum magnet Rb2Cu2Mo3O12 are investigated by magnetic, thermodynamic, and electron spin resonance (ESR) measurements. Quantum phase transitions between the gapped, magnetically ordered, and fully saturated phases are observed. Surprisingly, the former has a distinctive three-dimensional character, while the latter is dominated by one-dimensional quantum spin fluctuations. The entire H-T phase diagram is mapped out and found to be substantially anisotropic. In particular, the lower critical fields differ by over 50% depending on the direction of applied field, while the upper ones are almost isotropic, as is the magnetization above saturation. The ESR spectra are strongly dependent on field orientation and point to a helical structure with a rigidly defined spin rotation plane.

【 授权许可】

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