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We report a detailed study of upper critical field in superconducting topological semimetal CaSn$_{3}$ with the AuCu$_{3}$-type cubic structure (point group: $O_{h}$). We find that the anisotropy of the upper critical field shows two-fold symmetry about a $C_{4}$ axis, breaking the rotational symmetry of the underlying crystal lattice... (read more)
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