SrCuV₂O₇和BaCuV₂O₇的低维铁磁特性

Low-dimensional ferromagnetic properties of SrCuV2O7 and BaCuV2O7.

作者信息

Belik Alexei A, Azuma Masaki, Matsuo Akira, Kindo Koichi, Takano Mikio

机构信息

Institute for Chemical Research, Kyoto University, Uji, Japan.

出版信息

Inorg Chem. 2005 May 16;44(10):3762-6. doi: 10.1021/ic050164m.

DOI:10.1021/ic050164m

PMID:15877461

Abstract

The crystal structure of isostructural SrCuV(2)O(7) and BaCuV(2)O(7) consists of one-dimensional (1D) zigzag chains of Cu atoms with next-nearest-neighbor interaction. The main intrachain interaction was found to be ferromagnetic and estimated at 4.6 K (Hamiltonian H approximately -2J). SrCuV(2)O(7) and BaCuV(2)O(7) are new examples in the scanty family of 1D ferromagnets. Isothermal magnetization measurements at 0.08 K and specific heat data showed that MCuV(2)O(7) exhibits antiferromagnetic long-range ordering at T(N) = 1.36 K for SrCuV(2)O(7) and T(N) = 1.47 K for BaCuV(2)O(7). Spin-flop transitions were observed in the antiferromagnetic state at 0.08 K near 0.5 kOe in SrCuV(2)O(7) and 2 kOe in BaCuV(2)O(7). In air, SrCuV(2)O(7) and BaCuV(2)O(7) melted incongruently above 983 and 1018 K, respectively.

摘要

同结构的SrCuV₂O₇和BaCuV₂O₇的晶体结构由具有次近邻相互作用的一维（1D）之字形铜原子链组成。发现链内主要相互作用为铁磁性，估计为4.6 K（哈密顿量H≈ -2J）。SrCuV₂O₇和BaCuV₂O₇是一维铁磁体这一稀少家族中的新例子。在0.08 K下的等温磁化测量和比热数据表明，对于SrCuV₂O₇，MCuV₂O₇在TN = 1.36 K时表现出反铁磁长程序，对于BaCuV₂O₇，TN = 1.47 K。在0.08 K时，在反铁磁态中观察到自旋翻转转变，在SrCuV₂O₇中接近0.5 kOe，在BaCuV₂O₇中为2 kOe。在空气中，SrCuV₂O₇和BaCuV₂O₇分别在983 K和1018 K以上不一致地熔化。