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Micro-Raman study of the role of pressure in mercury-based superconductors

Title
Micro-Raman study of the role of pressure in mercury-based superconductors
Authors
Yang I.-S.Shin H.-S.Lee H.-G.Jeon S.-J.Ahn H.-S.Yu J.Lee S.Lee S.-I.Hur N.H.
Ewha Authors
양인상
SCOPUS Author ID
양인상scopus
Issue Date
1995
Journal Title
Physical Review B
ISSN
0163-1829JCR Link
Citation
vol. 51, no. 1, pp. 644 - 647
Indexed
SCOPUS scopus
Abstract
Understanding the role of pressure in increasing Tc is a crucial issue in mercury-based superconductors. We report on the effect of pressure on the Raman frequency () of the apical oxygen (OA) in Hg-OA-Cu bonds of HgBa2Can-1CunO2n+2+ superconductors. For both Hg-1201 and Hg-1223, (2/02)/P is found to be strongly correlated with Tc/P, where 0 is the frequency at ambient pressure. Together with our local-density approximation total-energy phonon study of the OA-A1g Raman mode, it is concluded that the change of the OA Raman frequency is due to the change in Hg-OA bond strength, which may be directly related to the charge transfer between the CuO2 planes and the Hg-O layers. © 1995 The American Physical Society.
DOI
10.1103/PhysRevB.51.644
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자연과학대학 > 물리학전공 > Journal papers
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