## 摘要

A complete phase diagram of Zn-substituted quantum quasi-two-dimensional helimagnet LiCu_{2}O_{2} has been presented. Helical ordering transition temperature (T_{h}) of the original LiCu_{2} 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 T_{c} (Zn>0.055,H). The magnetic coupling constants of nearest-neighbor J_{1} and next-nearest-neighbor J_{2} (α= 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.

原文 | 英語 |
---|---|

文章編號 | 094450 |

期刊 | Physical Review B - Condensed Matter and Materials Physics |

卷 | 82 |

發行號 | 9 |

DOIs | |

出版狀態 | 已發佈 - 2010 9月 29 |

## ASJC Scopus subject areas

- 電子、光磁材料
- 凝聚態物理學

## 指紋

深入研究「Nonmagnetic impurity perturbation to the quasi-two-dimensional quantum helimagnet LiCu_{2}O

_{2}」主題。共同形成了獨特的指紋。