English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Thermal expansion, sound velocities, specific heat and pressure derivative of Tc in YBa2Cu3O7

MPS-Authors
There are no MPG-Authors available
External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Lang, M., Lechner, T., Riegel, S., Steglich, F., Weber, G., Kim, T. J., et al. (1988). Thermal expansion, sound velocities, specific heat and pressure derivative of Tc in YBa2Cu3O7. Zeitschrift für Physik B, 69(4), 459-463. doi:10.1007/BF01312506.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-CF8F-E
Abstract
We report measurements, between helium and room temperature, of the thermal expansion α(T), sound velocitiesv L (T) andv T (v) and specific heatC(T) of YBa2Cu3O7 samples, all cut from the same sintered pellet. A linear term in α(T) is resolved at low temperatures. It is compared with a corresponding term in the low temperature specific heat and, using the bulk modulus from our sound propagation measurements, a Grüneisen parameter of usual size (1.2±0.4) is derived-in conformity with the possible existence of non-superconducting carriers well belowT c . Longtime drift effects in the length of the sample between 30 K and 60 K point to the vicinity of a structural instability. The Debye temperature derived fromC(T) amounts to about 450 K atT=T c =91 K and forT→0 approaches 350 K, in agreement with the value deduced fromv L (T) andv T (T). The superconducting transition is indicated by anomalies with idealized discontinuities Δα and ΔC. A thermodynamic relation between Δα and ΔC yields the relative pressure derivative ofT c ,t p =T c −1 (∂T c /∂p) p→0=+(0.7±0.2)·10−7 kbar−1.