Ultrasonic shear velocity anomalies in bulk thallium-1212 high temperature superconductor

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Abstract

Ultrasonic shear velocity of bulk TlSr2(Ca, Cr)Cu2O7 and (Tl, Bi)Sr2(Ca, Cr)Cu2O7 high temperature superconductors has been measured between 80 K and above 200 K at 8 MHz. A hardening trend was observed in both samples as the temperature was lowered. A large thermal hysteresis was observed in the TlSr2(Ca, Cr)Cu2O7 (density 3.74 g/cm3) but very much suppressed in the (Tl, Bi)Sr2(Ca, Cr)Cu2O7 (density 5.40 g/cm3) sample. Shear velocity hysteresis in these materials is very much determined by the density and microstructure and may not be directly related to high temperature superconductivitv. A pronounced change in the shear velocity at about 160-190 K signifying a softening tendency was observed in the (Tl, Bi)Sr2(Ca, Cr)Cu2O7 material. Some possible mechanisms of the origin of these anomalies are discussed.

Original languageEnglish
Pages (from-to)359-365
Number of pages7
JournalModern Physics Letters B
Volume11
Issue number8
Publication statusPublished - 10 Apr 1997

Fingerprint

High-temperature Superconductors
Thallium
High temperature superconductors
thallium
high temperature superconductors
Anomaly
ultrasonics
Ultrasonics
anomalies
shear
Hysteresis
hysteresis
Softening
Hardening
hardening
softening
Microstructure
tendencies
trends
Temperature

ASJC Scopus subject areas

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

Cite this

Ultrasonic shear velocity anomalies in bulk thallium-1212 high temperature superconductor. / Abd. Shukor, Roslan.

In: Modern Physics Letters B, Vol. 11, No. 8, 10.04.1997, p. 359-365.

Research output: Contribution to journalArticle

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