Spin fluctuations in CuGeO 3 probed by light scattering
Spin fluctuations in CuGeO 3 probed by light scattering
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通过光散射探测 CuGeO 3 中的自旋涨落
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
M. Hase
中科院分区：
文献类型：
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作者：
H. Kuroe;J. Sasaki;T. Sekine;N. Koide;Y. Sasago;K. Uchinokura;M. Hase
我们测量了CuGeO_3的低频拉曼光谱随温度的变化，并观察到在自旋-Peierls转变温度以上的(c，c)_3偏振态的准弹性散射。我们将其归因于自旋系统中能量密度的涨落。磁比热和磁关联长度的倒数可以从准弹性散射中得到。在高温下，磁关联长度的倒数与$(T-T_{SP})^{1/2}$成正比。我们将比热与竞争的$J$模型进行比较。该模型不能用相同的参数同时定量地解释比热和磁化率。对这种差异的原因进行了讨论。
We have measured temperature dependence of low-frequency Raman spectra in CuGeO$_3$, and have observed the quasi-elastic scattering in the $(c,c)$ polarization above the spin-Peierls transition temperature. We attribute it to the fluctuations of energy density in the spin system. The magnetic specific heat and an inverse of the magnetic correlation length can be derived from the quasi-elastic scattering. The inverse of the magnetic correlation length is proportional to $(T-T_{SP})^{1/2}$ at high temperatures. We compare the specific heat with a competing-$J$ model. This model cannot explain quantitatively both the specific heat and the magnetic susceptibility with the same parameters. The origin of this discrepancy is discussed.