Structural instabilities and superconductivity in La-214 compounds

Y. Maeno; M. Nohara; F. Nakamura; T. Suzuki; T. Fujita

doi:10.1007/BF00730365

Structural instabilities and superconductivity in La-214 compounds

Y. Maeno, M. Nohara, F. Nakamura, T. Suzuki, T. Fujita

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

9 Citations (Scopus)

Abstract

In La_2-xBa_xCuO₄ (LBCO) the transition to a low-temperature tetragonal phase and the suppression of superconductivity occur at the carrier concentration p≈ 1/8 per copper. We will discuss the roles of various material parameters that control this instability. An unusual lattice softening has been found by ultrasonic measurement on La_2-xSr_xCuO₄ (LSCO). This softening is present only in an in-plane shearing mode and is ascribed to the growth of structural fluctuations in the normal state. These phenomena are closely related because both the structural change in LBCO and the applied strain in LSCO lift the degeneracy of in-plane oxygen sites. They clarify the importance of strong coupling between the normal-state electronic system and the lattice by a Peierls-type mechanism.

Original language	English
Pages (from-to)	39-43
Number of pages	5
Journal	Journal of Superconductivity
Volume	7
Issue number	1
DOIs	https://doi.org/10.1007/BF00730365
Publication status	Published - Feb 1 1994
Externally published	Yes

Keywords

1/8 problem
La(Ba, Sr, Ca),CuO
LaNdBaCuO
LaThBaCuO
Low-temperature tetragonal (TLT) phase

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Physics and Astronomy (miscellaneous)

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10.1007/BF00730365

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title = "Structural instabilities and superconductivity in La-214 compounds",

abstract = "In La2-xBaxCuO4 (LBCO) the transition to a low-temperature tetragonal phase and the suppression of superconductivity occur at the carrier concentration p≈ 1/8 per copper. We will discuss the roles of various material parameters that control this instability. An unusual lattice softening has been found by ultrasonic measurement on La2-xSrxCuO4 (LSCO). This softening is present only in an in-plane shearing mode and is ascribed to the growth of structural fluctuations in the normal state. These phenomena are closely related because both the structural change in LBCO and the applied strain in LSCO lift the degeneracy of in-plane oxygen sites. They clarify the importance of strong coupling between the normal-state electronic system and the lattice by a Peierls-type mechanism.",

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author = "Y. Maeno and M. Nohara and F. Nakamura and T. Suzuki and T. Fujita",

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T1 - Structural instabilities and superconductivity in La-214 compounds

AU - Maeno, Y.

AU - Nohara, M.

AU - Nakamura, F.

AU - Suzuki, T.

AU - Fujita, T.

PY - 1994/2/1

Y1 - 1994/2/1

N2 - In La2-xBaxCuO4 (LBCO) the transition to a low-temperature tetragonal phase and the suppression of superconductivity occur at the carrier concentration p≈ 1/8 per copper. We will discuss the roles of various material parameters that control this instability. An unusual lattice softening has been found by ultrasonic measurement on La2-xSrxCuO4 (LSCO). This softening is present only in an in-plane shearing mode and is ascribed to the growth of structural fluctuations in the normal state. These phenomena are closely related because both the structural change in LBCO and the applied strain in LSCO lift the degeneracy of in-plane oxygen sites. They clarify the importance of strong coupling between the normal-state electronic system and the lattice by a Peierls-type mechanism.

AB - In La2-xBaxCuO4 (LBCO) the transition to a low-temperature tetragonal phase and the suppression of superconductivity occur at the carrier concentration p≈ 1/8 per copper. We will discuss the roles of various material parameters that control this instability. An unusual lattice softening has been found by ultrasonic measurement on La2-xSrxCuO4 (LSCO). This softening is present only in an in-plane shearing mode and is ascribed to the growth of structural fluctuations in the normal state. These phenomena are closely related because both the structural change in LBCO and the applied strain in LSCO lift the degeneracy of in-plane oxygen sites. They clarify the importance of strong coupling between the normal-state electronic system and the lattice by a Peierls-type mechanism.

KW - 1/8 problem

KW - La(Ba, Sr, Ca),CuO

KW - LaNdBaCuO

KW - LaThBaCuO

KW - Low-temperature tetragonal (TLT) phase

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Structural instabilities and superconductivity in La-214 compounds

Abstract

Keywords

ASJC Scopus subject areas

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