Superconductor to spin-density-wave transition in quasi-one-dimensional metals with repulsive anisotropic interaction
✍ Scribed by A.V. Rozhkov
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 99 KB
- Volume
- 460-462
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
A mechanism for superconductivity in a quasi-one-dimensional system with repulsive Ising-anisotropic interaction is studied. The Ising anisotropy opens the gap D s in the spin sector of the model. This gap allows the triplet superconductivity and the spin-density wave as the only broken symmetry phases. These phases are separated by the first order transition. The transport properties of the system are investigated in different parts of the phase diagram. The calculation of DC conductivity r(T) in the high-temperature phase shows that the function r(T) cannot be used as an indicator of a superconducting ground state: even if r(T) is a decreasing function at high temperature, yet, the ground state may be insulating spin-density wave; the opposite is also true. The calculation of the spin dynamical structure factor S zz (q, x) demonstrates that it is affected by the superconducting phase transition in a qualitative fashion: below T c the structure factor develops a gap with a coherent excitation inside this gap.