轨道-自旋耦合体系中晶体结构的磁场切换：MnV2O4
Magnetic-field switching of crystal structure in an orbital-spin-coupled system: MnV2O4.
作者信息
Adachi K, Suzuki T, Kato K, Osaka K, Takata M, Katsufuji T
机构信息
Department of Physics, Waseda University, Tokyo 169-8555, Japan.
出版信息
Phys Rev Lett. 2005 Nov 4;95(19):197202. doi: 10.1103/PhysRevLett.95.197202. Epub 2005 Nov 2.
We studied the magnetic and structural properties of spinel MnV2O4, which has S=5/2 spin with no orbital degrees of freedom on the Mn2+ site and S=1 spin and three orbital degrees of freedom on the V3+ site. We found that the ferrimagnetic ordering at TN=56.5K and the structural phase transition at Ts=53.5K are closely correlated in this compound and found a switching of crystal structure between cubic and tetragonal phases by the magnetic field. This phenomenon can be explained by the coupling between orbital and spin degrees of freedom in the t2g states of the V site.
我们研究了尖晶石型MnV2O4的磁性和结构特性，该化合物在Mn2+位点具有S = 5/2自旋且无轨道自由度，在V3+位点具有S = 1自旋和三个轨道自由度。我们发现，该化合物中在TN = 56.5K时的亚铁磁有序和在Ts = 53.5K时的结构相变紧密相关，并且发现通过磁场可使立方相和四方相之间的晶体结构发生转变。这种现象可以通过V位点t2g态中轨道自由度与自旋自由度之间的耦合来解释。
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