Electronic states of doped holes in La(2-x)SrxCuO4: A unique application of XAFS

Edward A. Stern; Victor Z. Polinger; Daniel Haskel

doi:10.1107/S0909049599001405

Electronic states of doped holes in La_(2-x)Sr_xCuO₄: A unique application of XAFS

Edward A. Stern, Victor Z. Polinger, Daniel Haskel

University of Washington

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

6 Scopus citations

Abstract

Polarized XAFS measurements on powder of La_{2-cursive Greek chi}Sr_{cursive Greek chi}CuO₄ with aligned c-axes find that apical oxygens neighboring only the Sr dopants have a double-site distribution. The occupation of both sites totals one oxygen, is independent of temperature, but changes with cursive Greek chi. A theory of the double-site is presented in terms of Jahn-Teller distortions (JT) induced by the extrinsic doped holes paired with the intrinsic holes present in the undoped cursive Greek chi = 0 sample. These pairs reside in singlet and triplet impurity states and satisfy Bose statistics. It is speculated that high T_c occurs because of Bose-condensation of the singlet pairs. Because of the strong electron-lattice interaction of the JT effect, XAFS can determine the corresponding electronic states in this special case.

Original language	English
Pages (from-to)	373-375
Number of pages	3
Journal	Journal of Synchrotron Radiation
Volume	6
Issue number	3
DOIs	https://doi.org/10.1107/S0909049599001405
State	Published - 1 May 1999
Externally published	Yes

Keywords

Impurity States
Jahn-Teller distortions
Superconductivity

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10.1107/S0909049599001405

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title = "Electronic states of doped holes in La(2-x)SrxCuO4: A unique application of XAFS",

abstract = "Polarized XAFS measurements on powder of La2-cursive Greek chiSrcursive Greek chiCuO4 with aligned c-axes find that apical oxygens neighboring only the Sr dopants have a double-site distribution. The occupation of both sites totals one oxygen, is independent of temperature, but changes with cursive Greek chi. A theory of the double-site is presented in terms of Jahn-Teller distortions (JT) induced by the extrinsic doped holes paired with the intrinsic holes present in the undoped cursive Greek chi = 0 sample. These pairs reside in singlet and triplet impurity states and satisfy Bose statistics. It is speculated that high Tc occurs because of Bose-condensation of the singlet pairs. Because of the strong electron-lattice interaction of the JT effect, XAFS can determine the corresponding electronic states in this special case.",

keywords = "Impurity States, Jahn-Teller distortions, Superconductivity",

author = "Stern, {Edward A.} and Polinger, {Victor Z.} and Daniel Haskel",

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T2 - A unique application of XAFS

AU - Stern, Edward A.

AU - Polinger, Victor Z.

AU - Haskel, Daniel

PY - 1999/5/1

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N2 - Polarized XAFS measurements on powder of La2-cursive Greek chiSrcursive Greek chiCuO4 with aligned c-axes find that apical oxygens neighboring only the Sr dopants have a double-site distribution. The occupation of both sites totals one oxygen, is independent of temperature, but changes with cursive Greek chi. A theory of the double-site is presented in terms of Jahn-Teller distortions (JT) induced by the extrinsic doped holes paired with the intrinsic holes present in the undoped cursive Greek chi = 0 sample. These pairs reside in singlet and triplet impurity states and satisfy Bose statistics. It is speculated that high Tc occurs because of Bose-condensation of the singlet pairs. Because of the strong electron-lattice interaction of the JT effect, XAFS can determine the corresponding electronic states in this special case.

AB - Polarized XAFS measurements on powder of La2-cursive Greek chiSrcursive Greek chiCuO4 with aligned c-axes find that apical oxygens neighboring only the Sr dopants have a double-site distribution. The occupation of both sites totals one oxygen, is independent of temperature, but changes with cursive Greek chi. A theory of the double-site is presented in terms of Jahn-Teller distortions (JT) induced by the extrinsic doped holes paired with the intrinsic holes present in the undoped cursive Greek chi = 0 sample. These pairs reside in singlet and triplet impurity states and satisfy Bose statistics. It is speculated that high Tc occurs because of Bose-condensation of the singlet pairs. Because of the strong electron-lattice interaction of the JT effect, XAFS can determine the corresponding electronic states in this special case.

KW - Impurity States

KW - Jahn-Teller distortions

KW - Superconductivity

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Electronic states of doped holes in La_(2-x)Sr_xCuO₄: A unique application of XAFS

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