Vanishing vortex creep at the transition from ordered to disordered vortex phases in Ba$_{0.64}$K$_{0.36}$Fe$_2$As$_2$
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| Format: | Preprint |
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2024
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| _version_ | 1866916619719016448 |
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| author | Liu, Yu-Hao Xie, Wei Wen, Hai-Hu |
| author_facet | Liu, Yu-Hao Xie, Wei Wen, Hai-Hu |
| contents | By measuring the dynamical and conventional magnetization relaxation of the Ba$_{0.64}$K$_{0.36}$Fe$_2$As$_2$ single crystals, we found strong second peak effect on the magnetization hysteresis loops. It is found that there is a kink of magnetization at a field between the valley and maximum magnetization. Interestingly, the magnetization relaxation rate has a deep minimum at the field with the kink, indicating a diminished vortex creep. The relaxation rate at this field is clearly smaller than the so-called universal lower limit of the relaxation rate characterized by ($S_0\approx \ Gi^{1/2}(T/T_\mathrm{c}$). This diminished vortex creep is associated with the origin of the SMP effect and attributed to the strongly hindered flux motion when experiencing the transition from the quasi-ordered to disordered vortex phases. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_12551 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Vanishing vortex creep at the transition from ordered to disordered vortex phases in Ba$_{0.64}$K$_{0.36}$Fe$_2$As$_2$ Liu, Yu-Hao Xie, Wei Wen, Hai-Hu Superconductivity By measuring the dynamical and conventional magnetization relaxation of the Ba$_{0.64}$K$_{0.36}$Fe$_2$As$_2$ single crystals, we found strong second peak effect on the magnetization hysteresis loops. It is found that there is a kink of magnetization at a field between the valley and maximum magnetization. Interestingly, the magnetization relaxation rate has a deep minimum at the field with the kink, indicating a diminished vortex creep. The relaxation rate at this field is clearly smaller than the so-called universal lower limit of the relaxation rate characterized by ($S_0\approx \ Gi^{1/2}(T/T_\mathrm{c}$). This diminished vortex creep is associated with the origin of the SMP effect and attributed to the strongly hindered flux motion when experiencing the transition from the quasi-ordered to disordered vortex phases. |
| title | Vanishing vortex creep at the transition from ordered to disordered vortex phases in Ba$_{0.64}$K$_{0.36}$Fe$_2$As$_2$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2401.12551 |