標題: Nonmagnetic impurity perturbation to the quasi-two-dimensional quantum helimagnet LiCu2O2
作者: Hsu, H. C.
Lin, J. -Y.
Lee, W. L.
Chu, M. -W.
Imai, T.
Kao, Y. J.
Hu, C. D.
Liu, H. L.
Chou, F. C.
物理研究所
Institute of Physics
公開日期: 29-Sep-2010
摘要: A complete phase diagram of Zn-substituted quantum quasi-two-dimensional helimagnet LiCu2O2 has been presented. Helical ordering transition temperature (T-h) of the original LiCu2O2 follows finite size scaling for less than similar to 5.5% Zn substitution, which implies the existence of finite helimagnetic domains with domain boundaries formed with nearly isolated spins. Higher Zn substitution >= 5.5% quenches the long-range helical ordering and introduces an intriguing Zn-level-dependent magnetic phase transition with slight thermal hysteresis and a universal quadratic field dependence for T-c(Zn > 0.055, H). The magnetic coupling constants of nearest-neighbor J(1) and next-nearest-neighbor J(2) (alpha = J(2)/J(1)) are extracted from high temperature series expansion fitting and N = 16 finite chain exact diagonalization simulation. We have also provided evidence of direct correlation between long-range helical spin ordering and the magnitude of electric polarization in this spin-driven multiferroic material.
URI: http://dx.doi.org/10.1103/PhysRevB.82.094450
http://hdl.handle.net/11536/150051
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.82.094450
期刊: PHYSICAL REVIEW B
Volume: 82
Issue: 9
起始頁: 0
結束頁: 0
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