AC magnetic response of superconducting single crystals exhibiting a second peak on the DC magnetization curves
| Autor: | Traian Petrisor, Dana Miu, A. Park, L. Miu, A. Crisan, A. Ionescu, Tsuyoshi Tamegai |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Superconductivity
Materials science Magnetic moment Condensed matter physics Demagnetizing field Energy Engineering and Power Technology 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Magnetic hysteresis 01 natural sciences Electronic Optical and Magnetic Materials Magnetic field Magnetization Amplitude Condensed Matter::Superconductivity 0103 physical sciences Electrical and Electronic Engineering 010306 general physics 0210 nano-technology Penetration depth |
| Zdroj: | Physica C: Superconductivity and its Applications. 555:1-6 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/j.physc.2018.10.002 |
| Popis: | The strong modulation of the AC magnetic response in the magnetic field-temperature region of the DC magnetization peak effect (PE) occurring just below the DC irreversibility line (IL) of weakly pinned superconducting single crystals is well known. However, it is not yet clear if the AC magnetic signal registered at usual frequencies and amplitudes is significantly affected by the presence of the second magnetization peak (SMP) in the DC magnetic hysteresis curves, since the SMP appears in specimens with stronger pinning and is located well below the IL. We investigated the AC magnetic response of several La2−xSrxCuO4 and 122-type pnictide superconducting single crystals exhibiting a pronounced DC SMP. It was found that in the case of small demagnetization effects, the AC magnetic signal across the SMP remains in the linear regime, with no detectable distortions in the SMP range (within the high sensitivity of a Physical Property Measurement System). This indicates reduced values of the Campbell penetration depth compared with the London magnetic penetration depth. A clearly nonmonotonic, SMP-related variation has only been obtained for the DC field dependence of the out of phase component of the AC magnetic moment in the nonlinear regime. The nonlinear AC Bean regime far below the IL has been attained in the conditions of enhanced demagnetization effects (plate-like specimens in perpendicular magnetic fields). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect