Anomalous behaviour of the 147 cm-1 Cu(2) Raman mode in YBa2Cu4O8 under high pressure. Signature of change in the electronic state of the CuO2 plane

M. Kakihana; H. Arashi; M. Yashima; M. Yoshimura; L. Börjesson; M. Käll

doi:10.1016/0921-4534(94)90464-2

Anomalous behaviour of the 147 cm^-1 Cu(2) Raman mode in YBa₂Cu₄O₈ under high pressure. Signature of change in the electronic state of the CuO₂ plane

M. Kakihana, H. Arashi, M. Yashima, M. Yoshimura, L. Börjesson, M. Käll

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

10 Citations (Scopus)

Abstract

The effect of pressure on Raman modes of ceramic superconducting samples of YBa₂Cu₄O₈ has been investigated up to 16 GPa at room temperature. While frequencies of the modes at 101, 250, 310, 339, 500 and 605 cm^-1 increase almost linearly with increasing pressure, the mode at 147 cm^-1 corresponding to the z-motion of Cu(2) atoms in the CuO₂ plane exhibited a nonlinearity at pressure exceeding 6 GPa. A correlation is observed between the pressure-induced changes in T_c and the change in the frequency of the Cu(2) mode. We propose that the anomalous nonlinear behaviour of the Cu(2) mode in the high pressure regime is a signature of changes in the electronic state of the CuO₂ plane resulting from a charge carrier redistribution between Cu(2) and O(2/3) in the conducting CuO₂ plane.

Original language	English
Pages (from-to)	199-206
Number of pages	8
Journal	Physica C: Superconductivity and its applications
Volume	230
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(94)90464-2
Publication status	Published - 1994 Sept 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/0921-4534(94)90464-2

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abstract = "The effect of pressure on Raman modes of ceramic superconducting samples of YBa2Cu4O8 has been investigated up to 16 GPa at room temperature. While frequencies of the modes at 101, 250, 310, 339, 500 and 605 cm-1 increase almost linearly with increasing pressure, the mode at 147 cm-1 corresponding to the z-motion of Cu(2) atoms in the CuO2 plane exhibited a nonlinearity at pressure exceeding 6 GPa. A correlation is observed between the pressure-induced changes in Tc and the change in the frequency of the Cu(2) mode. We propose that the anomalous nonlinear behaviour of the Cu(2) mode in the high pressure regime is a signature of changes in the electronic state of the CuO2 plane resulting from a charge carrier redistribution between Cu(2) and O(2/3) in the conducting CuO2 plane.",

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AU - Kakihana, M.

AU - Arashi, H.

AU - Yashima, M.

AU - Yoshimura, M.

AU - Börjesson, L.

AU - Käll, M.

PY - 1994/9/1

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N2 - The effect of pressure on Raman modes of ceramic superconducting samples of YBa2Cu4O8 has been investigated up to 16 GPa at room temperature. While frequencies of the modes at 101, 250, 310, 339, 500 and 605 cm-1 increase almost linearly with increasing pressure, the mode at 147 cm-1 corresponding to the z-motion of Cu(2) atoms in the CuO2 plane exhibited a nonlinearity at pressure exceeding 6 GPa. A correlation is observed between the pressure-induced changes in Tc and the change in the frequency of the Cu(2) mode. We propose that the anomalous nonlinear behaviour of the Cu(2) mode in the high pressure regime is a signature of changes in the electronic state of the CuO2 plane resulting from a charge carrier redistribution between Cu(2) and O(2/3) in the conducting CuO2 plane.

AB - The effect of pressure on Raman modes of ceramic superconducting samples of YBa2Cu4O8 has been investigated up to 16 GPa at room temperature. While frequencies of the modes at 101, 250, 310, 339, 500 and 605 cm-1 increase almost linearly with increasing pressure, the mode at 147 cm-1 corresponding to the z-motion of Cu(2) atoms in the CuO2 plane exhibited a nonlinearity at pressure exceeding 6 GPa. A correlation is observed between the pressure-induced changes in Tc and the change in the frequency of the Cu(2) mode. We propose that the anomalous nonlinear behaviour of the Cu(2) mode in the high pressure regime is a signature of changes in the electronic state of the CuO2 plane resulting from a charge carrier redistribution between Cu(2) and O(2/3) in the conducting CuO2 plane.

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Anomalous behaviour of the 147 cm^-1 Cu(2) Raman mode in YBa₂Cu₄O₈ under high pressure. Signature of change in the electronic state of the CuO₂ plane

Abstract

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