Studies of superconductivity and structure for CaC6 to pressures above 15 GPa

Details Studies of superconductivity and structure for CaC6 to pressures above 15 GPa Studies of superconductivity and structure for CaC6 to pressures above 15 GPa

2009-04-20

arxiv.org/abs/0904.3138v1

Phys. Rev. B 82, 132502 (2010)

Physics

Condensed Matter

Superconductivity

Scientific paper

The dependence of the superconducting transition temperature Tc of CaC6 has been determined as a function of hydrostatic pressure in both helium-loaded gas and diamond-anvil cells to 0.6 and 32 GPa, respectively. Following an initial increase at the rate +0.39(1) K/GPa, Tc drops abruptly from 15 K to 4 K at 10 GPa. Synchrotron x-ray measurements to 15 GPa point to a structural transition near 10 GPa from a rhombohedral to a higher symmetry phase.

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