The photopyroelectric technique has been used to study the critical behavior of thermal diffusivity and thermal conductivity of Cr2O3 at the antiferromagnetic-paramagnetic phase transition. Deviation from the conventional Van Hove theory has been observed and the results have been explained in terms of a uniaxial model (n=1) with energy conservation and a nonconserved order parameter. A sharp dip, due to critical slowing down, is present in the thermal diffusivity while the thermal conductivity shows no anomaly in the critical region. A power-law fit with a background contribution and a term to correct for the thermal-diffusivity anomaly gives a critical exponent b=-0.09±0.02 and a critical amplitude ratio of U+/U-=0.51. © 1994 The American Physical Society.

Marinelli, M., Mercuri, F., Zammit, U., Pizzoferrato, R., Scudieri, F., & Dadarlat, D. (1994). Critical behavior of thermal diffusivity and thermal conductivity of Cr2O3 at the Néel transition. PHYSICAL REVIEW. B, CONDENSED MATTER, 49(6), 4356-4359 [10.1103/PhysRevB.49.4356].

Critical behavior of thermal diffusivity and thermal conductivity of Cr2O3 at the Néel transition

MARINELLI, MASSIMO;MERCURI, FULVIO;ZAMMIT, UGO;PIZZOFERRATO, ROBERTO;SCUDIERI, FOLCO;
1994

Abstract

The photopyroelectric technique has been used to study the critical behavior of thermal diffusivity and thermal conductivity of Cr2O3 at the antiferromagnetic-paramagnetic phase transition. Deviation from the conventional Van Hove theory has been observed and the results have been explained in terms of a uniaxial model (n=1) with energy conservation and a nonconserved order parameter. A sharp dip, due to critical slowing down, is present in the thermal diffusivity while the thermal conductivity shows no anomaly in the critical region. A power-law fit with a background contribution and a term to correct for the thermal-diffusivity anomaly gives a critical exponent b=-0.09±0.02 and a critical amplitude ratio of U+/U-=0.51. © 1994 The American Physical Society.
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Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - Fisica Sperimentale
Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)
English
photopyroelectric technique; thermal diffusivity; thermal conductivity
Marinelli, M., Mercuri, F., Zammit, U., Pizzoferrato, R., Scudieri, F., & Dadarlat, D. (1994). Critical behavior of thermal diffusivity and thermal conductivity of Cr2O3 at the Néel transition. PHYSICAL REVIEW. B, CONDENSED MATTER, 49(6), 4356-4359 [10.1103/PhysRevB.49.4356].
Marinelli, M; Mercuri, F; Zammit, U; Pizzoferrato, R; Scudieri, F; Dadarlat, D
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/130902
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