1. Paramagnetic Response and Novel Metastability Effects in a Single Crystal of Superconducting Ca3Ir4Sn13.
- Author
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Kumar, Santosh, Singh, Ravi P., Thamizhavel, A., Tomy, C. V., and Grover, A. K.
- Subjects
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CALCIUM compounds , *PARAMAGNETISM , *SINGLE crystals , *SUPERCONDUCTORS , *TEMPERATURE effect , *MAGNETIZATION - Abstract
We have studied some curious effects of an external perturbation on the temperature-dependent field-cooled cool-down magnetization response (MFCC (T)) in a single crystal of a low Tc (≈ 7.10 K) superconductor Ca3Ir4Sn13. The MFCC (T) response in the superconducting state (just below Tc) of this compound shows anomalous paramagnetic magnetization signal(s). In the field-temperature (H-T) region wherein the paramagnetic magnetization occurs in Ca3Ir4Sn13, a perturbation applied to the system in the form of an impulse of an ac magnetic field results in an unpredictable switching of the magnetization from a given paramagnetic value to a diamagnetic or to a different paramagnetic value. The magnetization response is thus found to be multi-valued at a given (H,T) value. The MFCC (T) curves are found to be path-dependent below Tc. Surprisingly, our results obtained in a bulk type-II superconductor Ca3Ir4Sn13 resemble strongly with the characteristics of the magnetization behavior anticipated for the giant vortex states with multiple flux quanta (LΦ0, Φ0 = hc/2e, L > 1) known to occur in the mesoscopic-sized superconductors. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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