Nonmagnetic impurity perturbation to the quasi-two-dimensional quantum helimagnet LiCu2O2

H. C. Hsu, J. Y. Lin, W. L. Lee, M. W. Chu, T. Imai, Y. J. Kao, C. D. Hu, H. L. Liu, F. C. Chou

研究成果: 雜誌貢獻期刊論文同行評審

14 引文 斯高帕斯(Scopus)

摘要

A complete phase diagram of Zn-substituted quantum quasi-two-dimensional helimagnet LiCu2O2 has been presented. Helical ordering transition temperature (Th) of the original LiCu2 O 2 follows finite size scaling for less than ∼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 Tc (Zn>0.055,H). The magnetic coupling constants of nearest-neighbor J1 and next-nearest-neighbor J2 (α= J2 / J1) 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.

原文英語
文章編號094450
期刊Physical Review B - Condensed Matter and Materials Physics
82
發行號9
DOIs
出版狀態已發佈 - 2010 九月 29

ASJC Scopus subject areas

  • 電子、光磁材料
  • 凝聚態物理學

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