Multiple Phase Transition in Unconventional Superconducting Films
| Autor: | Nobumi Miyawaki, Seiji Higashitani |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Superconductivity
Physics Phase transition Condensed matter physics Fermi surface Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 010305 fluids & plasmas T-symmetry Condensed Matter::Superconductivity 0103 physical sciences Bound state General Materials Science Cooper pair 010306 general physics Ground state Phase diagram |
| Zdroj: | Journal of Low Temperature Physics. 187:545-552 |
| ISSN: | 1573-7357 0022-2291 |
| DOI: | 10.1007/s10909-016-1685-7 |
| Popis: | When Andreev bound states are formed at the surfaces of a superconducting film, there may arise, as the ground state of the film, a superconducting state with broken time-reversal symmetry ( $$\mathcal {T}$$ ). In this state, Cooper pairs with a finite center-of-mass momentum $$\mathbf {q}$$ are formed without external fields. We focus on the $$\mathcal {T}$$ -breaking state in a d-wave superconducting film and investigate the effect of the Fermi surface shape on its stability region in the T– $$D^{-1}$$ phase diagram (T: temperature, D: film thickness). The phase boundaries separating the normal state, the $$\mathcal {T}$$ -breaking superconducting state, and the trivial ( $$\mathbf {q} = 0$$ ) superconducting state are determined for various Fermi surface shapes ranging from cylindrical to square. It is found that the region of the $$\mathcal {T}$$ -breaking phase is substantially enlarged when the Fermi surface is square-shaped. This is mainly because the critical thickness $$D_c$$ between the normal and $$\mathcal {T}$$ -breaking states is significantly reduced when the Fermi surface has a good nesting property. |
| Databáze: | OpenAIRE |
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