Electron spin resonance of defects in the Haldane system Y2BaNiO5

Article

关键词: HEISENBERG-ANTIFERROMAGNET;    CHAINS;    EXCITATIONS;    HEAT;   

DOI  :  10.1103/PhysRevB.60.R12553

来源: SCIE

【 摘 要 】

We calculate the electron paramagnetic resonance (EPR) spectra of the antiferromagnetic spin-1 chain compound Y2BaNi1-xMgxO5 for different values oft and temperature T much lower than the Haldane gap (similar to 100 K). The low-energy spectrum of an anisotropic Heisenberg Hamiltonian, with all parameters determined from experiment, has been solved using the density-matrix renormalization-group method. The observed EPR spectra are quantitatively reproduced by this model. The presence of end-chain S = 1/2 states is clearly observed as the main peak in the spectrum and the remaining structure is completely understood. [S0163-1829(99)50742-X].

【 授权许可】

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