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

doi:10.1016/S1293-2558(00)01086-4

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

School of Arts and Sciences, Chemistry & Chemical Biology

Research output: Contribution to journal › Article › peer-review

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 T_c = 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 T_c. Fits of the modulus in terms of the specific heat, entropy, and free energy suggest that fluctuations are strongly stress- and sample-dependent.

Original language	English (US)
Pages (from-to)	759-766
Number of pages	8
Journal	Solid State Sciences
Volume	2
Issue number	8
DOIs	https://doi.org/10.1016/S1293-2558(00)01086-4
State	Published - 2000

All Science Journal Classification (ASJC) codes

General Chemistry
General Materials Science
Condensed Matter Physics

Keywords

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

Access to Document

10.1016/S1293-2558(00)01086-4

Cite this

@article{e6146e1f610c428b9f5e19812d7d3cff,

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

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.",

keywords = "Free energy, Internal friction, Specific heat, Spin-Peierls, Tricritical, Young's modulus, α′-NaVO",

author = "Emanuel Postolache and Powell, {D. K.} and G. Popov and Rai, {Ram C.} and M. Greenblatt and Brill, {J. W.}",

note = "Funding Information: We thank J.P. Straley for helpful discussions. This research was supported by the U.S. National Science Foundation, Grants #DMR-9731257 and DMR-9613106. ",

year = "2000",

doi = "10.1016/S1293-2558(00)01086-4",

language = "English (US)",

volume = "2",

pages = "759--766",

journal = "Solid State Sciences",

issn = "1293-2558",

publisher = "Elsevier Masson s.r.l.",

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TY - JOUR

T1 - Comparison of Young's modulus and specific heat anomalies at the magnetic transition in α′-NaV2O5

AU - Postolache, Emanuel

AU - Powell, D. K.

AU - Popov, G.

AU - Rai, Ram C.

AU - Greenblatt, M.

AU - Brill, J. W.

N1 - Funding Information: We thank J.P. Straley for helpful discussions. This research was supported by the U.S. National Science Foundation, Grants #DMR-9731257 and DMR-9613106.

PY - 2000

Y1 - 2000

N2 - 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.

AB - 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.

KW - Free energy

KW - Internal friction

KW - Specific heat

KW - Spin-Peierls

KW - Tricritical

KW - Young's modulus

KW - α′-NaVO

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DO - 10.1016/S1293-2558(00)01086-4

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