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

In Sang Yang; Hye Soo Shin; Hye Gyong Lee; Seung Joon Jeon; Hang Sun Ahn; Jaejun Yu; Sergey Lee; Sung Ik Lee; Nam H. Hur

doi:10.1103/PhysRevB.51.644

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

In Sang Yang, Hye Soo Shin, Hye Gyong Lee, Seung Joon Jeon, Hang Sun Ahn, Jaejun Yu, Sergey Lee, Sung Ik Lee, Nam H. Hur

Department of Physics

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

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.

Original language	English
Pages (from-to)	644-647
Number of pages	4
Journal	Physical Review B
Volume	51
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.51.644
State	Published - 1995

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title = "Micro-Raman study of the role of pressure in mercury-based superconductors",

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.",

author = "Yang, {In Sang} and Shin, {Hye Soo} and Lee, {Hye Gyong} and Jeon, {Seung Joon} and Ahn, {Hang Sun} and Jaejun Yu and Sergey Lee and Lee, {Sung Ik} and Hur, {Nam H.}",

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T1 - Micro-Raman study of the role of pressure in mercury-based superconductors

AU - Yang, In Sang

AU - Shin, Hye Soo

AU - Lee, Hye Gyong

AU - Jeon, Seung Joon

AU - Ahn, Hang Sun

AU - Yu, Jaejun

AU - Lee, Sergey

AU - Lee, Sung Ik

AU - Hur, Nam H.

PY - 1995

Y1 - 1995

N2 - 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.

AB - 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.

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

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