On Dimer Pairing Mechanism of Superconductivity
On Dimer Pairing Mechanism of Superconductivity
复制标题
超导二聚体配对机制研究
DOI：
10.1143/jpsj.61.423
复制
发表时间：
1992
影响因子：
1.7
通讯作者：
M. Imada
中科院分区：
文献类型：
--
作者：
M. Imada
研究了二聚体配对超导体的物理性质。该对具有有限的净动量，破坏了晶格的平移对称性和规范对称性。数值求解了二聚化t-J模型和自旋-Peierls t-J模型的平均场方程，讨论了二聚体配对机制的新特征。计算了超导态的动力学自旋极化率，讨论了超导态中的自旋激发。在没有节点的费米面上，能隙打开，而在核磁共振弛豫速率中没有Hebel-Slichter峰。
Physical properties in a dimer pairing superconductor are examined. The pairing has a finite net momentum and breaks lattice translational symmetry as well as the gauge symmetry. The mean field equations for the dimerized t - J model and the spin-Peierls t - J model are solved numerically to discuss novel features of the dimer pairing mechanism. The dynamical spin susceptibility is calculated to discuss spin excitations in the superconducting state. The energy gap opens over the Fermi surface without nodes, while the Hebel-Slichter peak is absent in the NMR relaxation rate.