Reduced dimensionality and magnetic frustration in KCr3As3
Reduced dimensionality and magnetic frustration in KCr3As3
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DOI：
10.1103/physrevb.92.235107
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发表时间：
2015-05
影响因子：
3.7
通讯作者：
C. Cao;Hao Jiang;Xiao-Yong Feng;J. Dai
中科院分区：
文献类型：
--
作者：
C. Cao;Hao Jiang;Xiao-Yong Feng;J. Dai
.非磁态有五个费米面片，分别涉及三个准一维能带和两个三维能带。然而，基态是磁性的，表现出一个novelinterlayer反铁磁秩序的基本块自旋状态的单位铬三角形保留一个highspin幅度。此外，它的费米面只涉及三个一维片，由于降维，提供了该化合物中局部矩的证据。通过对扭转自旋管模型的拟合，发现由局域磁矩引起的磁挫弛豫，导致无隙自旋激发。预期在增加层内交换相互作用时，将出现向无序低块自旋态的阻挫诱导转变。
. Thenon-magnetic state has five Fermi surface sheets involving respectively three quasi-one-dimensionaland two three-dimensional energy bands. However, the ground state is magnetic, exhibiting a novelinterlayer antiferromagnetic order where the basic block-spin state of a unit Cr triangle retains a highspin magnitude. Moreover, its Fermi surface involves three one-dimensional sheets only, providingevidence for local moments in this compound due to the reduced dimensionality. By fitting a twistedspin tube model the magnetic frustrations caused by local moments are found to be relaxed, leadingto gapless spin excitations. A frustration-induced transition to the disordered low block-spin stateis expected upon increasing the intralayer exchange interaction.