Competing electronic ground states in La1-xCaxCoO3 -: art. no. 054401
Competing electronic ground states in La1-xCaxCoO3 -: art. no. 054401
复制标题
DOI：
10.1103/physrevb.69.054401
复制
发表时间：
2004-02-01
影响因子：
3.7
通讯作者：
Short, S
中科院分区：
文献类型：
--
作者：
Burley, JC;Mitchell, JF;Short, S
我们提出了一个中子粉末衍射研究La 1-xCaxCoO 3的结果。与以前的报道相反，我们发现在barc->Pnma上的一级结构转变R（3）是x和T的函数。自旋态转变发生作为一个函数的x，T所示的细胞体积的变化，与宏观上不均匀的自旋态混合物在x=0.1的证据。磁性行为一般平行的La 1-xSrxCoO 3，与自旋玻璃行为和铁磁性的证据。
We present the results of a neutron powder-diffraction study on La1-xCaxCoO3. We show that, contrary to previous reports, a first-order structural transition R (3) over barc-->Pnma occurs as a function of both x and T. Spin-state transitions occur as a function of x, T as indicated by the changes in cell volume, with evidence of a macroscopically inhomogeneous spin-state mixture at x=0.1. The magnetic behavior generally parallels that of La1-xSrxCoO3, with evidence for both spin-glass behavior and ferromagnetism.