Magnon Enhancement of Electronic Specific Heat
Magnon Enhancement of Electronic Specific Heat
复制标题
电子比热磁振子增强
DOI：
10.1103/physrevlett.19.501
复制
发表时间：
1967
影响因子：
8.6
通讯作者：
R. Turner
中科院分区：
文献类型：
--
作者：
H. Cole;R. Turner
电子-声子增强源于虚声子的产生和湮灭，电子-磁振子增强源于虚磁振子的产生和湮灭。然而，这两种情况之间有重要的区别。首先，由于传导电子的极化，自旋向下的电子的费米面位于自旋向上的电子的费米面之外。（量化的方向是-z方向。）为了在零温度下产生自旋波，自旋向上的费米面上的电子必须被带到自旋向下的费米面。由于费米面之间的差距，在此过程中产生磁振子的能量将达到最小。其次，由于长波长磁振子的色散规律和极化效应，费米能级附近的电子寿命与电子-声子相互作用的寿命有很大的不同。我们已经计算了电子的自能部分，使用微扰理论的Giovannini，彼得，和Koide。
The electron-phonon enhancement arises from the creation and annihilationof virtual phonons; similarly, the electron-magnon enhancement arises from the creation and annihilation ofvirtual magnons. However, there are important differences between thetwo cases. Firstly, because of the polarization ofthe conduction electrons, the Fermi surface for the spin-down electronslies outside the Fermi surface for spin-up electrons.(Direction of quantization is in the—z direction.) To create a spin wave at zero temperature, an electron on the spin-up Fermi surface has to be taken to the spin-down Fermi surface. Because of the gap between the Fermi surfaces, there will be a minimum energy for the creation of magnons by this process. Secondly, because of the dispersion law for long-wavelength magnons and also the polari-zation effect, the lifetime of electrons in the neighborhood of the Fermi energy is signifi-cantly different from the lifetimebecause of the electron-phonon interaction. We have calculated the electron self-energy part, using the pertubation theory developed by Giovannini, Peter, and Koide.