Pressure effect on elastic, lattice dynamic and superconducting behaviour of yttrium sulfide: A first principle study

2014 ◽  
Vol 115 (12) ◽  
pp. 123502 ◽  
Author(s):  
B. D. Sahoo ◽  
K. D. Joshi ◽  
Satish C. Gupta
Keyword(s):  
Pressure Effect ◽  
Lattice Dynamic ◽  
First Principle ◽  
Elastic Lattice ◽  
Superconducting Behaviour

PRESSURE EFFECT ON THE MgB2 ELECTRON STRUCTURE FROM FIRST PRINCIPLE CALCULATIONS

2007 ◽  
Vol 21 (16) ◽  
pp. 2793-2803
Author(s):  
LI CHEN
Keyword(s):  
Electronic Structure ◽  
Fermi Level ◽  
Density Of States ◽  
Electron Distribution ◽  
Pressure Effect ◽  
The Other ◽  
First Principle ◽  
First Principle Calculations ◽  
Bonding Property ◽  
Density Population

The electronic structure of MgB 2 with different lattice parameters, which represents the influence of pressure, has been studied from HF calculation. It has been found that the density of states at the Fermi level decreases with the decrease in lattice constant, which implies that the pressure can reduce the superconductivity of MgB 2. It was also found that more electrons are introduced from the Mg layer to the B layer with increasing pressure, resulting in the number of holes on the B layer being reduced, thus reducing superconductivity. The electron density population at different pressures clearly shows that the triangle-shaped electron distribution in the B plane, extended along the B–B bonds, indicates the typical sp2 orbitals. On the other hand, there is no covalency feature between Mg and B atoms, indicating the ionic bonding property between Mg and B layers.

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