Ultrasonic velocity studies on superconducting and non-superconducting ErBa2Cu3O7 - δ

Roslan Abd. Shukor, S. S. Lee, M. Yahya

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The shear ultrasonic velocity of single-phase polycrystalline superconducting (orthorhombic) and non-superconducting (tetragonal) samples of ErBa2Cu3O7 - δ has been determined from 80 to 210 K using the pulse-echo-overlap ultrasonic method at 10 MHz. The absolute shear velocity decreased when the oxygen content was reduced from O6.92 to O6.25. An elastic anomaly was observed just below 200 K in the superconducting but not in the non-superconducting sample. No difference in the grain size and porosity of both samples was observed and the elastic behavior was explained in terms of the different oxygen contents. The acoustic Debye temperature of the superconducting sample in the void-free approximation was estimated to be ΘD ∼ 480 K.

Original languageEnglish
Pages (from-to)134-138
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume243
Issue number1-2
DOIs
Publication statusPublished - 20 Feb 1995

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Ultrasonic velocity
ultrasonics
Oxygen
Debye temperature
Porosity
Ultrasonics
Acoustics
shear
oxygen
voids
echoes
grain size
specific heat
anomalies
porosity
acoustics
pulses
approximation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Ultrasonic velocity studies on superconducting and non-superconducting ErBa2Cu3O7 - δ . / Abd. Shukor, Roslan; Lee, S. S.; Yahya, M.

In: Physica C: Superconductivity and its Applications, Vol. 243, No. 1-2, 20.02.1995, p. 134-138.

Research output: Contribution to journalArticle

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