Journal
PHYSICAL REVIEW B
Volume 61, Issue 6, Pages R3800-R3803Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.61.R3800
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We have studied the occurrence of superconductivity under pressure in the CaSi2 family of compounds, namely the semimetallic trigonal phase and the alpha-ThSi2-type tetragonal one. Although only the latter is superconducting (T-c = 1.56 K) at ambient pressure, starting from the trigonal phase and applying high pressure (>12 GPa) we have found a new superconducting phase with T-c(onset) similar to 14 K, among the highest ever found in silicon based materials.
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