Pressure-induced effects in high-Tc superconductors

Raman scattering as a probe of charge-lattice dynamics under high pressure

M. Osada, M. Kakihana, M. Käll, L. Börjesson

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The Raman spectra of Bi2Sr2CaCu2O8+d (Bi2212) and YBa2Cu4O8 (Y124) have been investigated as a function of hydrostatic pressure. In both the overdoped Bi2212 and the underdoped Y124, the 140 cm-1 Cu mode exhibits a pronounced nonlinear pressure dependence which correlates to the dependence of Tc versus pressure. We argue that this behavior is a signature of charge-redistribution effects induced by compression. For Bi2212, we also find that the mode-specific Grüneisen parameters scale inversely with the corresponding phonon frequencies, a behavior which is reminiscent of phonon pressure dependences in molecular solids.

Original languageEnglish
Pages (from-to)142-145
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume357-360
Issue numberSUPPL. 2
DOIs
Publication statusPublished - 2001 Aug
Externally publishedYes

Fingerprint

Lattice vibrations
pressure dependence
Superconducting materials
Raman scattering
Raman spectra
probes
hydrostatic pressure
signatures
Hydrostatic pressure

Keywords

  • BiSrCaCuO
  • High pressure
  • Raman scattering
  • YBa CuO

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Pressure-induced effects in high-Tc superconductors : Raman scattering as a probe of charge-lattice dynamics under high pressure. / Osada, M.; Kakihana, M.; Käll, M.; Börjesson, L.

In: Physica C: Superconductivity and its Applications, Vol. 357-360, No. SUPPL. 2, 08.2001, p. 142-145.

Research output: Contribution to journalArticle

@article{1cae931942c84ff7800f5432ba7d7709,
title = "Pressure-induced effects in high-Tc superconductors: Raman scattering as a probe of charge-lattice dynamics under high pressure",
abstract = "The Raman spectra of Bi2Sr2CaCu2O8+d (Bi2212) and YBa2Cu4O8 (Y124) have been investigated as a function of hydrostatic pressure. In both the overdoped Bi2212 and the underdoped Y124, the 140 cm-1 Cu mode exhibits a pronounced nonlinear pressure dependence which correlates to the dependence of Tc versus pressure. We argue that this behavior is a signature of charge-redistribution effects induced by compression. For Bi2212, we also find that the mode-specific Gr{\"u}neisen parameters scale inversely with the corresponding phonon frequencies, a behavior which is reminiscent of phonon pressure dependences in molecular solids.",
keywords = "BiSrCaCuO, High pressure, Raman scattering, YBa CuO",
author = "M. Osada and M. Kakihana and M. K{\"a}ll and L. B{\"o}rjesson",
year = "2001",
month = "8",
doi = "10.1016/S0921-4534(01)00206-4",
language = "English",
volume = "357-360",
pages = "142--145",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",
number = "SUPPL. 2",

}

TY - JOUR

T1 - Pressure-induced effects in high-Tc superconductors

T2 - Raman scattering as a probe of charge-lattice dynamics under high pressure

AU - Osada, M.

AU - Kakihana, M.

AU - Käll, M.

AU - Börjesson, L.

PY - 2001/8

Y1 - 2001/8

N2 - The Raman spectra of Bi2Sr2CaCu2O8+d (Bi2212) and YBa2Cu4O8 (Y124) have been investigated as a function of hydrostatic pressure. In both the overdoped Bi2212 and the underdoped Y124, the 140 cm-1 Cu mode exhibits a pronounced nonlinear pressure dependence which correlates to the dependence of Tc versus pressure. We argue that this behavior is a signature of charge-redistribution effects induced by compression. For Bi2212, we also find that the mode-specific Grüneisen parameters scale inversely with the corresponding phonon frequencies, a behavior which is reminiscent of phonon pressure dependences in molecular solids.

AB - The Raman spectra of Bi2Sr2CaCu2O8+d (Bi2212) and YBa2Cu4O8 (Y124) have been investigated as a function of hydrostatic pressure. In both the overdoped Bi2212 and the underdoped Y124, the 140 cm-1 Cu mode exhibits a pronounced nonlinear pressure dependence which correlates to the dependence of Tc versus pressure. We argue that this behavior is a signature of charge-redistribution effects induced by compression. For Bi2212, we also find that the mode-specific Grüneisen parameters scale inversely with the corresponding phonon frequencies, a behavior which is reminiscent of phonon pressure dependences in molecular solids.

KW - BiSrCaCuO

KW - High pressure

KW - Raman scattering

KW - YBa CuO

UR - http://www.scopus.com/inward/record.url?scp=18744436753&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=18744436753&partnerID=8YFLogxK

U2 - 10.1016/S0921-4534(01)00206-4

DO - 10.1016/S0921-4534(01)00206-4

M3 - Article

VL - 357-360

SP - 142

EP - 145

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - SUPPL. 2

ER -