We have performed ab initio calculations for new high-pressure phase of Ca-VI between 158-180 GPa The study includes elastic parameters of mono- and poly-crystalline aggregates, electronic band structure, lattice dynamics and superconductivity The calculations show that the orthorhombic Pnma structure is mechanically and dynamically stable in the pressure range studied The structure is superconducting in the entire pressure range and the calculated Tc (~25K) is maximum at ~172 GPa, where the transfer of charges from 4s to 3d may be thought to be completed

High pressure Ca-VI phase between 158-180 GPa: Stability, electronic structure and superconductivity

We have performed ab initio calculations for a new high pressure phase of Ca-VI between 158 and 180 GPa. The study includes elastic parameters of monocrystalline and polycrystalline aggregates, electronic band structure, lattice dynamics and superconductivity. The calculations show that the orthorhombic Pnma structure is mechanically and dynamically stable in the pressure range studied. The structure is superconducting over the entire pressure range and the calculated Tc (24.7 K with μ* = 0.1) is maximum at 172 GPa, which is close to the experimentally observed value of 25 K at 161 GPa.

A high pressure Ca-VI phase between 158 and 180 GPa: stability, electronic structure and superconductivity.

Electrical resistance of Ca is measured under pressures up to 150 GPa and at temperatures down to 0.05 K. Superconductivity is observed at temperatures below 3 K under pressures above 85 GPa. The superconducting transition temperature increases linearly with increasing pressure and reaches about 15 K at 150 GPa.

Superconductivity of Calcium under High Pressures

Electronic structures, lattice dynamics, and electron phonon coupling of simple cubic Ca under pressure

Superconductivity induced by pressure.

Benjamin Schrunk*, Yevhen Kushnirenko*, 2 Brinda Kuthanazhi, 2 Junyeong Ahn, Lin-Lin Wang, Evan O’Leary, 2 Kyungchan Lee, 2 Andrew Eaton, 2 Alexander Fedorov, 5 Rui Lou, 4 Vladimir Voroshnin, Oliver J. Clark, Jaime Sánchez-Barriga, Sergey L. Bud’ko, 2 Robert-Jan Slager, 7, ∗ Paul C. Canfield, 2, † and Adam Kaminski 2, ‡ Ames Laboratory, Ames, Iowa 50011, USA Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA Department of Physics, Harvard University, Cambridge MA 02138, USA Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China TCM Group, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom

Emergence of Fermi arcs and novel magnetic splitting in an antiferromagnet

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Superconductivity induced by pressure.

Emergence of Fermi arcs and novel magnetic splitting in an antiferromagnet