ScholarWorks@성균관대학교

초록

Superconductivity with coexisting ferromagnetism has drawn significant interest in condensed matter physics because of its potential to reveal novel coupling mechanisms. In this study, we synthesized successfully polycrystalline SmC10 using the solid-state reaction technique. Powder x-ray diffraction reveals that it crystallizes in a cubic structure (space group Im3) with a unit cell of a = b = c = 10.8288 & Aring;. A superconducting transition (Ts) is seen at 4 K after applying a magnetic field of 0.0005 T. The magnetization data shows that superconductivity and ferromagnetism coexist together at 3.90 K at 0.001 T. The reentrant of superconductivity at 0.0005 T was observed even after applying 0.1 T. To develop an understanding of the pairing mechanism, we applied fields along perpendicular and parallel to c axis (H perpendicular to c and H & Vert;c). The upward curvature of FC data keeps increasing up to 0.1 T; after that, it starts suppressing, but it persists. We also find a thermodynamic signature of transition at low temperatures; a superconducting transition is seen, which looks to be the spin-triplet type. The DC heat capacity data indicates that when specific heat divided by temperature (C/T) verses T2 is plotted, it yields gamma = 2958 mJ/molK2, and Debye's temperature (theta D) was found to be 29.47. The SmC10 crystal system offers a promising direction to explore unconventional superconductivity and spin-triplet pairing, addressing a critical challenge in modern condensed matter physics.

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