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Sharp electronic structure and anomalous isotope effect in Zr, Nb 3 Sn, and YBa 2 Cu 3 O 7
Author(s) -
Zhao GuangLin
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201451112
Subject(s) - superconductivity , condensed matter physics , fermi level , electronic structure , work (physics) , materials science , isotope , electron , physics , nuclear physics , thermodynamics
Anomalously small isotope effect in some high and low T c superconductors such as Zr, Nb 3 Sn, YBa 2 Cu 3 O 7 created a great challenge for understanding. In this work, a new methodology was implemented by integrating first‐principles calculations of electronic structures of the materials into the theory of many‐body physics for superconductivity (the generalized T c equation developed by Abrikosov et al.). The aim is to seek a unified methodology to calculate the electronic and superconducting properties of these materials. It is shown that the electronic structures of Zr, Nb 3 Sn, YBa 2 Cu 3 O 7 are very complex. The electron densities of states around the Fermi level in Zr, Nb 3 Sn, YBa 2 Cu 3 O 7 possess sharp variations that could have a significant contribution to the anomalous isotope effect in these superconductors. However, there still exist some differences between the calculated and experimental results that require further research work.