Spin-specific heat determination of the ratio of competing first- and second-neighbor exchange interactions in frustrated spin-12 chains
Spin-specific heat determination of the ratio of competing first- and second-neighbor exchange interactions in frustrated spin-12 chains
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DOI：
10.1103/physrevb.97.064407
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发表时间：
2018-02
影响因子：
3.7
通讯作者：
Dayasindhu Dey;Manoranjan Kumar;S. Dutton;R. Cava;Z. Soos
中科院分区：
文献类型：
--
作者：
Dayasindhu Dey;Manoranjan Kumar;S. Dutton;R. Cava;Z. Soos
自旋1/2链的磁化率$\chi（T）$被广泛用于量化交换相互作用，即使对于第一邻居之间的铁磁$J_1$和第二邻居之间的反铁磁$J_2$的不同组合，$\chi（T）$是相似的。我们指出，自旋比热C（T）直接决定了比值\alpha = J_2/|J_1| $竞争的互动。用J1-J2模型拟合了LiCuSbO 4中自旋为1/2的Cu（II）链的等温磁化强度M（T，H）和C（T，H）。通过固定$\alpha$，$C（T）$解决了从具有阻挫自旋链的铜酸盐中$M（T，H）$获得的抵消的$J_1$，$\alpha$组合。
The magnetic susceptibility $\chi(T)$ of spin-1/2 chains is widely used to quantify exchange interactions, even though $\chi(T)$ is similar for different combinations of ferromagnetic $J_1$ between first neighbors and antiferromagnetic $J_2$ between second neighbors. We point out that the spin specific heat $C(T)$ directly determines the ratio $\alpha = J_2/|J_1|$ of competing interactions. The $J_1-J_2$ model is used to fit the isothermal magnetization $M(T,H)$ and $C(T,H)$ of spin-1/2 Cu(II) chains in LiCuSbO$_4$. By fixing $\alpha$, $C(T)$ resolves the offsetting $J_1$, $\alpha$ combinations obtained from $M(T,H)$ in cuprates with frustrated spin chains.