Structural instabilities and superconductivity in La-214 compounds

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

Research output: Contribution to journalArticle

8 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)39-43
Number of pages5
JournalJournal of Superconductivity
Volume7
Issue number1
DOIs
Publication statusPublished - Feb 1994
Externally publishedYes

Fingerprint

Ultrasonic measurement
Electronic states
Superconductivity
Shearing
softening
Carrier concentration
Copper
superconductivity
Oxygen
shearing
ultrasonics
retarding
copper
Temperature
oxygen
electronics

Keywords

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

ASJC Scopus subject areas

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

Cite this

Structural instabilities and superconductivity in La-214 compounds. / Maeno, Y.; Nohara, Minoru; Nakamura, F.; Suzuki, T.; Fujita, T.

In: Journal of Superconductivity, Vol. 7, No. 1, 02.1994, p. 39-43.

Research output: Contribution to journalArticle

Maeno, Y. ; Nohara, Minoru ; Nakamura, F. ; Suzuki, T. ; Fujita, T. / Structural instabilities and superconductivity in La-214 compounds. In: Journal of Superconductivity. 1994 ; Vol. 7, No. 1. pp. 39-43.
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