Twin boundary effects on spontaneous half-quantized vortices in superconducting composite structures (d-dot’s)
| Autor: | Norio Fujita, Takekazu Ishida, Masaru Kato |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Composite number Energy Engineering and Power Technology Electron Condensed Matter Physics Electronic Optical and Magnetic Materials Vortex Effective mass (solid-state physics) Condensed Matter::Superconductivity Orthorhombic crystal system Electrical and Electronic Engineering Crystal twinning Anisotropy |
| Zdroj: | Physica C: Superconductivity and its Applications. 518:44-46 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/j.physc.2015.04.002 |
| Popis: | We investigate effects of anisotropy of an orthorhombic structure in twin domains on spontaneous half-quantized vortices (SHQVs) in a d-dot, which is a nano-scaled composite structure that consists of a d -wave superconductor embedded in an s -wave matrix. Since YBa 2 Cu 3 O 7 − δ (YBCO) has the orthorhombic structure, there are twin domains separated by twin boundaries (TBs). In order to analyze effects of TBs on SHQVs, we derive two-component Ginzburg–Landau equations, in which electrons in YBCO have anisotropic effective mass. It is found that the magnitude of field around SHQVs is monotonically decreasing with increasing anisotropy of effective mass and finally peak values of the fields become zero. This means that anisotropy of the effective mass suppresses SHQVs and when the anisotropy is too large, SHQVs do not appear in d-dot’s. |
| Databáze: | OpenAIRE |
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