High-temperature superconducting phase of HBr under pressure predicted by first-principles calculations

The high pressure phases of HBr are explored with an ab initio crystal structure search. By taking into account the contribution of zero-point energy (ZPE), we find that the P4/nmm phase of HBr is thermodynamically stable in the pressure range from 150 to 200 GPa. The superconducting critical temper...

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Bibliographic Details
Published in:Physical review. B 2017-08, Vol.96 (6), Article 064517
Main Authors: Gu, Qinyan, Lu, Pengchao, Xia, Kang, Sun, Jian, Xing, Dingyu
Format: Article
Language:English
Subjects:
Atomic properties
Bromine
Chlorine
Coordination numbers
Crystal structure
First principles
Hydrides
Hydrogen atoms
Hydrogen storage
Superconductivity
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Summary:The high pressure phases of HBr are explored with an ab initio crystal structure search. By taking into account the contribution of zero-point energy (ZPE), we find that the P4/nmm phase of HBr is thermodynamically stable in the pressure range from 150 to 200 GPa. The superconducting critical temperature (Tc) of P4/nmm HBr is evaluated to be around 73 K at 170 GPa, which is the highest record so far among binary halogen hydrides. Its Tc can be further raised to around 95K under 170 GPa if half of the bromine atoms in the P4/nmm HBr are substituted by the lighter chlorine atoms. Our study shows that, in addition to lower mass, higher coordination number, shorter bonds, and more highly symmetric environment for the hydrogen atoms are important factors to enhance the superconductivity in hydrides.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.064517