On the spin gap phase in λ-(BETS)2GaXzY4−z
On the spin gap phase in λ-(BETS)2GaXzY4−z
复制标题
关于 λ-(BETS)2GaXzY4−z 中的自旋间隙相
DOI：
10.1143/jpsj.66.3352
复制
发表时间：
1997
期刊：
影响因子：
4.4
通讯作者：
H. Fukuyama
中科院分区：
文献类型：
--
作者：
H. Seo;H. Fukuyama
从理论上研究了准二维有机导体λ-（BETS）2GaXzY 4 − z中绝缘态的性质，其中磁化率测量表明存在自旋能隙。在绝对零度下的Hartree-Fock计算表明，当在位库仑相互作用超过某一临界值时，反铁磁自旋有序出现，并最终导致绝缘态，这一绝缘态可以被认为是一个二维定域自旋系统.基于Katoh和Imada的量子Monte Carlo模拟，我们将表明该系统位于反铁磁相和自旋能隙相之间的边界附近。
Abstract The nature of the insulating state in the quasi-two-dimensional organic conductor λ-(BETS) 2 GaX z Y 4 − z , where the existence of a spin gap is suggested by susceptibility measurement, has been studied theoretically. The Hartree-Fock calculations at absolute zero temperature show that, ifthe on-site Coulomb interaction exceeds some critical value, antiferromagnetic spin ordering emerges and eventually leads to an insulating state which can be considered as a two-dimensional localized spin system. Based on the quantumMonte Carlo simulations by Katoh and Imada, we will show that this system is located near the boundary between the antiferromagnetic phase and the spin gap phase.