Anisotropic transport induced by DC electrical current bias near the critical current
| Autor: | Junghyun Shin, Sun-gyu Park, Eunseong Kim |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Superconductivity Multidisciplinary Materials science Condensed matter physics Mathematics and computing Physics lcsh:R lcsh:Medicine Biasing Thermal conduction 01 natural sciences Article Magnetic field 03 medical and health sciences 030104 developmental biology Nanoscience and technology 0103 physical sciences Perpendicular lcsh:Q Current (fluid) 010306 general physics Anisotropy lcsh:Science Current density |
| Zdroj: | Scientific Reports, Vol 10, Iss 1, Pp 1-10 (2020) Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | We investigated the transport characteristics of a square shape superconducting Ta thin film under DC electrical current bias along the diagonal direction. The resistance parallel (R∥) and perpendicular (R⊥) to the DC current, IDC, is measured with various magnetic fields. R∥ and R⊥ show contrasting dependence on IDC. First, the critical current of R∥ is smaller than that of R⊥. Second, R⊥ shows an unexpected reduction at current bias where R∥ shows a rapid increase near the transition from a flux flow state to a normal state. The intriguing anisotropic transport characteristics can be understood by the inhomogeneous current density profile over the square sample. Diagonal DC current induces an anisotropic current density profile where the current density is high near the biasing electrode and low at the center of the sample. Accordingly, the electrical transport in the perpendicular direction could remain less affected even near the critical current of R∥, which leads to the higher critical current in R⊥. Complicated conduction profile may also allow the anomalous reduction in the R⊥ before finally shifting to the normal state. |
| Databáze: | OpenAIRE |
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