Comparison of Young's modulus and specific heat anomalies at the magnetic transition in α′-NaV2O5

Emanuel Postolache, D. K. Powell, G. Popov, Ram C. Rai, M. Greenblatt, J. W. Brill

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3 Scopus citations

Abstract

We have measured Young's modulus (using a vibrating reed technique) and the specific heat (using ac calorimetry) on the same crystals of α′-NaV2O5 at its Tc = 34 K magnetic phase transition. Both properties exhibit large, unsymmetrical, and sample-dependent anomalies. While the specific heat results suggest tricritical behavior of the transition, large fluctuation effects are observed in the modulus above Tc. Fits of the modulus in terms of the specific heat, entropy, and free energy suggest that fluctuations are strongly stress- and sample-dependent.

Original languageEnglish (US)
Pages (from-to)759-766
Number of pages8
JournalSolid State Sciences
Volume2
Issue number8
DOIs
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • Free energy
  • Internal friction
  • Specific heat
  • Spin-Peierls
  • Tricritical
  • Young's modulus
  • α′-NaVO

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