Magnetic susceptibility and specific heat of a spinel MnV 2 O 4 single crystal
Magnetic susceptibility and specific heat of a spinel MnV 2 O 4 single crystal
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DOI：
10.1103/physrevb.83.024403
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发表时间：
2011-01
影响因子：
3.7
通讯作者：
K. Myung-Whun;K. Myung-Whun;J. S. Kim;J. S. Kim;T. Katsufuji;R. Kremer
中科院分区：
文献类型：
--
作者：
K. Myung-Whun;K. Myung-Whun;J. S. Kim;J. S. Kim;T. Katsufuji;R. Kremer
我们研究了尖晶石型MnVO单晶的磁性和热力学性质。磁化强度和磁化率在61K表现出铁磁有序的特征，磁化强度和比热的尖锐峰表明在58K发生了结构相变，这与散射实验相一致。比热数据显示出双跃迁的特征。除了温度较高的转变外，第二个转变发生在较低的温度，这将下面的相分为低磁场相和强磁场相。根据磁化率和比热，建立了宽范围的温度和磁场相图。低磁场相表现出类自旋玻璃态的特征。与同类材料的磁学和热力学性质的比较表明，MnVO中的低温、低磁场、类自旋玻璃相可能源于V离子轨道起伏引起的链间相互作用和链内交换作用的竞争。
We investigated the magnetic and the thermodynamic properties of a spinel MnVOsingle crystal. The magnetization and susceptibility show the signature of ferromagnetic ordering at61 K. A sharp peak in the magnetization and the specific heat indicate the structural phase transition at 58 K, consistent with the scattering experiments. The specific-heat data exhibits the signature of double transitions. In addition to the higher-temperature transition at, the second transition occurs at a lower temperature, which divides the phase belowinto a low-magnetic-field and a high-magnetic-field phase. Based on the magnetic susceptibility and the specific heat, a wide-range temperature and magnetic-field phase diagram was constructed. The low-magnetic-field phase shows the characteristics of a spin-glass-like state. A comparison with the magnetic and thermodynamic characteristics of similar materials suggests that the low temperature and low-magnetic-field, spin-glass-like phase in MnVOmay originate from the competition between the interchain and the intrachain exchange interaction owing to the fluctuating V-ion orbitals.