Complete bond-operator theory of the two-chain spin ladder

Article

关键词: BOSE-EINSTEIN CONDENSATION;    MAGNETIC-FIELD;    QUANTUM ANTIFERROMAGNETS;    TEMPERATURE PROPERTIES;    FINITE-TEMPERATURE;    SUPERCONDUCTIVITY;    MAGNONS;    STATES;    WAVES;    GAPS;   

DOI  :  10.1103/PhysRevB.83.054415

来源: SCIE

【 摘 要 】

The discovery of the almost ideal, two-chain spin-ladder material (C5H12N)(2)CuBr4 has once again focused attention on this most fundamental problem in low-dimensional quantum magnetism. With experimental data now available at all temperatures and magnetic fields, a correspondingly systematic theoretical description is required. This is obtained for the gapped regime within the bond-operator framework, by implementing three qualitative advances that account for triplet correlation effects, their evolution in a field, and the magnetization induced when both field and temperature are finite. Quantitative and parameter-free results are presented as experimental comparisons with the measured specific heat and as predictions for thermal renormalization of the triplet magnon excitations.

【 授权许可】

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