Specific-Heat of YBa2Cu3Ox up to 400 K: High-Resolution Adiabatic Measurements and Ab-initio LDA Phonon Calculations

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概要

• 論文の詳細を見る

• The specific heat of YBa2Cu3Ox ($x=6.7$, 6.9, and 7.0) has been determined to within 0.1% accuracy from 5 to 400 K using adiabatic calorimetry. The phonon specific heat contribution for $x=7.0$ is calculated using ab-initio LDA and subtracted from the experimental data, yielding estimates of the oxygen-ordering and electronic heat capacity contributions. The oxygen-ordering contribution agrees well with theoretical predictions. Although the LDA phonon heat capacity is found to be very accurate, it is not quite precise enough to reliably determine the electronic term over the whole temperature range. We demonstrate how small changes in the phonon density of states can affect the results, which underlines the extreme difficulty in accurately determining the electronic heat capacity of YBa2Cu3Ox.

• 2009-07-15

著者

• Wolf Thomas

  Forschungszentrum Karlsruhe Institut Fur Festkorperphysik

• Inaba Akira

  Research Center For Molecular Thermodynamics Graduate School Of Science Osaka University

• Meingast Christoph

  Research Center For Molecular Thermodynamics Graduate School Of Science Osaka University

• Reichardt Winfried

  Forschungszentrum Karlsruhe Institut Fur Festkorperphysik

• Heid Rolf

  Forschungszentrum Karlsruhe Institut Fur Festkorperphysik

• Pankoke Volker

  Forschungszentrum Karlsruhe Institut Fur Festkorperphysik

• Bohnen Klaus-peter

  Forschungszentrum Karlsruhe Institut Fur Festkorperphysik

• Meingast Christoph

  Research Center for Molecular Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043

• Reichardt Winfried

  Forschungszentrum Karlsruhe, Institut für Festkörperphysik, PO 3640, 76021 Karlsruhe, Germany

• Heid Rolf

  Forschungszentrum Karlsruhe, Institut für Festkörperphysik, PO 3640, 76021 Karlsruhe, Germany

• Bohnen Klaus-Peter

  Forschungszentrum Karlsruhe, Institut für Festkörperphysik, PO 3640, 76021 Karlsruhe, Germany

• Pankoke Volker

  Forschungszentrum Karlsruhe, Institut für Festkörperphysik, PO 3640, 76021 Karlsruhe, Germany

関連論文

• A New Nickel Coordination Polymer with Dynamic Channels that Mechanically Capture and Release Including Guest Molecules Responding to a Temperature Variation
• Specific-Heat of YBa_2Cu_3O_x up to 400K : High-Resolution Adiabatic Measurements and Ab-initio LDA Phonon Calculations
• Specific-Heat of YBa2Cu3Ox up to 400 K: High-Resolution Adiabatic Measurements and Ab-initio LDA Phonon Calculations

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