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Compressed Crystalline Bismuth and Superconductivity ̶ An ab initio computational Simulation

Published online by Cambridge University Press:  20 January 2017

David Hinojosa-Romero ,
Isaías Rodríguez ,
Zaahel Mata-Pinzón ,
Alexander Valladares ,
Renela Valladares  and
Ariel A. Valladares
David Hinojosa-Romero
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apartado Postal 70-360, Ciudad Universitaria, México, D.F. 04510, México.
Isaías Rodríguez
Affiliation:
Facultad de Ciencias, Universidad Nacional Autónoma de México, Apartado Postal 70-542, Ciudad Universitaria, México, D.F. 04510, México
Zaahel Mata-Pinzón
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apartado Postal 70-360, Ciudad Universitaria, México, D.F. 04510, México.
Alexander Valladares
Affiliation:
Facultad de Ciencias, Universidad Nacional Autónoma de México, Apartado Postal 70-542, Ciudad Universitaria, México, D.F. 04510, México
Renela Valladares
Affiliation:
Facultad de Ciencias, Universidad Nacional Autónoma de México, Apartado Postal 70-542, Ciudad Universitaria, México, D.F. 04510, México
Ariel A. Valladares
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apartado Postal 70-360, Ciudad Universitaria, México, D.F. 04510, México.
Corresponding
E-mail address:
valladar@unam.mx
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Abstract

Bismuth displays puzzling superconducting properties. In its crystalline equilibrium phase, it does not seem to superconduct at accessible low temperatures. However, in the amorphous phase it displays superconductivity at ∼ 6 K. Under pressure bismuth has been found to superconduct at Tcs that go from 3.9 K to 8.5 K depending on the phase obtained. So the question is: what electronic or vibrational changes occur that explains this radical transformation in the conducting behavior of this material? In a recent publication we argue that changes in the density of electronic and vibrational states may account for the behavior observed in the amorphous phase with respect to the crystal. We have now undertaken an ab initio computational study of the effects of pressure alone maintaining the original crystalline structure and compressing our supercell computationally. From the results obtained we infer that if the crystal structure remains the same (except for the contraction), no superconductivity will appear.

Keywords

Bi superconducting simulation
Type
Articles
Information
MRS Advances , Volume 2 , Issue 9: Theory, Characterization and Modeling , 2017 , pp. 499 - 506
Copyright
Copyright © Materials Research Society 2017 

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References

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Rodríguez, I., Valladares, A., Valladares, R. M., Valladares, A. A. (private communication)
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