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

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


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.

Original languageEnglish
Article number094450
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
Publication statusPublished - 2010 Sept 29

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


Dive into the research topics of 'Nonmagnetic impurity perturbation to the quasi-two-dimensional quantum helimagnet LiCu2O2'. Together they form a unique fingerprint.

Cite this