论文标题
哈伯德对群集的磁联和电气特性
Magnetocaloric and electrocaloric properties of the Hubbard pair cluster
论文作者
论文摘要
本文包含了模型二聚体（配对簇）中磁联和电的效应的讨论。感兴趣的系统是用哈伯族哈密顿量（包括外部电场和磁场）建模的。精确地描述了这种对的热力学，这是在大规范合奏的基础上，重点是填充能量状态的半填充。在广泛的外部场中计算并讨论感兴趣的量，例如磁熵，磁性特异性热以及由电场变化以及适当的Grüneisen比率导致的等温熵变化。强调了单线对三胞胎过渡对观察到的行为的重要性。发现直接和反热量效应的范围，并描述了磁电现象的表现。特别是，证明了磁电场效应与电场的可调性以及与磁场的电气效应的可调性。
The paper contains the discussion of the magnetocaloric and electrocaloric effect in a model dimer (pair cluster). The system of interest is modelled with a Hubbard Hamiltonian including the external electric and magnetic field. The thermodynamics of such pair is described exactly, on the grounds of the grand canonical ensemble, focusing on the half-filling of energy states. The quantities of interest, such as magnetic entropy, magnetic specific heat as well as isothermal entropy change resulting from the variation of either electric or magnetic field and appropriate Grüneisen ratios are calculated and discussed in a wide range of external fields. The importance of singlet to triplet transition for the observed behaviour is emphasized. The ranges of direct and inverse caloric effects are found and the manifestations of the magnetoelectric phenomena are described. In particular, the tunability of the magnetocaloric effect with electric field as well as tunability of the electrocaloric effect with magnetic field are demonstrated.
