Angle-resolved photoemission study of superconducting ladder compound Sr14-xCaxCu24O41

T. Sato; T. Yokoya; T. Takahashi; M. Uehara; T. Nagata; J. Goto; J. Akimitsu

doi:10.1016/S0022-3697(98)00148-6

Angle-resolved photoemission study of superconducting ladder compound Sr_14-xCa_xCu₂₄O₄₁

T. Sato, T. Yokoya, T. Takahashi, M. Uehara, T. Nagata, J. Goto, J. Akimitsu

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

5 Citations (Scopus)

Abstract

Angle-resolved photoemission spectroscopy has been performed on Sr_14-xCa_xCu₂₄O₄₁ (x = 0-11.5) which consists of two-leg Cu₂O₃ ladders and edge-sharing CuO₂ chains. A dispersive band with the periodicity of ladder sublattice is observed near the Fermi level (E_F) for x=0. The band shows a minimum binding energy at ka= (2n + 1)π/2, suggesting that a Mott-Hubbard gap opens on the ladder. This indicates that copper atoms on the ladder take essentially the divalent state (Cu²⁺) and a majority of self-doped holes reside on the chain. We found that the Ca substitution causes a transfer of holes from the chain to the ladder.

Original language	English
Pages (from-to)	1912-1916
Number of pages	5
Journal	Journal of Physics and Chemistry of Solids
Volume	59
Issue number	10-12
DOIs	https://doi.org/10.1016/S0022-3697(98)00148-6
Publication status	Published - 1998

Keywords

Angle-resolved photoemission
Band structure
Ladder compound
Mott-Hubbard gap
SrCaCuO

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10.1016/S0022-3697(98)00148-6

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title = "Angle-resolved photoemission study of superconducting ladder compound Sr14-xCaxCu24O41",

abstract = "Angle-resolved photoemission spectroscopy has been performed on Sr14-xCaxCu24O41 (x = 0-11.5) which consists of two-leg Cu2O3 ladders and edge-sharing CuO2 chains. A dispersive band with the periodicity of ladder sublattice is observed near the Fermi level (EF) for x=0. The band shows a minimum binding energy at ka= (2n + 1)π/2, suggesting that a Mott-Hubbard gap opens on the ladder. This indicates that copper atoms on the ladder take essentially the divalent state (Cu2+) and a majority of self-doped holes reside on the chain. We found that the Ca substitution causes a transfer of holes from the chain to the ladder.",

keywords = "Angle-resolved photoemission, Band structure, Ladder compound, Mott-Hubbard gap, SrCaCuO",

author = "T. Sato and T. Yokoya and T. Takahashi and M. Uehara and T. Nagata and J. Goto and J. Akimitsu",

note = "Funding Information: We are grateful to H. Tsunetsugu, T. Tohyama and S. Maekawa for their valuable discussion. We thank A. Ashihara, T. Ito, H. Kumigashira and H.-D. Kim for their help in photoemission measurements. T.Y. thanks the Japan Society for the Promotion of Science for financial support. This work was supported by grants from CREST (Core Research for Evolutional Science and Technology Corporation) and the Ministry of Education, Science and Culture of Japan.",

year = "1998",

doi = "10.1016/S0022-3697(98)00148-6",

language = "English",

volume = "59",

pages = "1912--1916",

journal = "Journal of Physics and Chemistry of Solids",

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TY - JOUR

T1 - Angle-resolved photoemission study of superconducting ladder compound Sr14-xCaxCu24O41

AU - Sato, T.

AU - Yokoya, T.

AU - Takahashi, T.

AU - Uehara, M.

AU - Nagata, T.

AU - Goto, J.

AU - Akimitsu, J.

N1 - Funding Information: We are grateful to H. Tsunetsugu, T. Tohyama and S. Maekawa for their valuable discussion. We thank A. Ashihara, T. Ito, H. Kumigashira and H.-D. Kim for their help in photoemission measurements. T.Y. thanks the Japan Society for the Promotion of Science for financial support. This work was supported by grants from CREST (Core Research for Evolutional Science and Technology Corporation) and the Ministry of Education, Science and Culture of Japan.

PY - 1998

Y1 - 1998

N2 - Angle-resolved photoemission spectroscopy has been performed on Sr14-xCaxCu24O41 (x = 0-11.5) which consists of two-leg Cu2O3 ladders and edge-sharing CuO2 chains. A dispersive band with the periodicity of ladder sublattice is observed near the Fermi level (EF) for x=0. The band shows a minimum binding energy at ka= (2n + 1)π/2, suggesting that a Mott-Hubbard gap opens on the ladder. This indicates that copper atoms on the ladder take essentially the divalent state (Cu2+) and a majority of self-doped holes reside on the chain. We found that the Ca substitution causes a transfer of holes from the chain to the ladder.

AB - Angle-resolved photoemission spectroscopy has been performed on Sr14-xCaxCu24O41 (x = 0-11.5) which consists of two-leg Cu2O3 ladders and edge-sharing CuO2 chains. A dispersive band with the periodicity of ladder sublattice is observed near the Fermi level (EF) for x=0. The band shows a minimum binding energy at ka= (2n + 1)π/2, suggesting that a Mott-Hubbard gap opens on the ladder. This indicates that copper atoms on the ladder take essentially the divalent state (Cu2+) and a majority of self-doped holes reside on the chain. We found that the Ca substitution causes a transfer of holes from the chain to the ladder.

KW - Angle-resolved photoemission

KW - Band structure

KW - Ladder compound

KW - Mott-Hubbard gap

KW - SrCaCuO

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JF - Journal of Physics and Chemistry of Solids

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Angle-resolved photoemission study of superconducting ladder compound Sr_14-xCa_xCu₂₄O₄₁

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