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

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.

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Lang, M.1, Author
Lechner, T.1, Author
Riegel, S.1, Author
Steglich, F.2, Author              
Weber, G.1, Author
Kim, T. J.1, Author
Lüthi, B.1, Author
Wolf, B.1, Author
Rietschel, H.1, Author
Wilhelm, M.1, Author
Affiliations:
1external, ou_persistent22              
2External Organizations, ou_persistent22              

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 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.

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 Dates: 1988-12-01
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: A1988L576200006
DOI: 10.1007/BF01312506
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Title: Zeitschrift für Physik B
  Other : Zeitschrift für Physik B Condensed Matter
Source Genre: Journal
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Publ. Info: Springer-Verlag
Pages: - Volume / Issue: 69 (4) Sequence Number: - Start / End Page: 459 - 463 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/0722-3277