A photopyroelectric technique has been used to simultaneously measure the critical behavior of specific heat, thermal conductivity, and thermal diffusivity of Cr2O3 at the antiferromagnetic-paramagnetic phase transition. An Ising-like behavior has been found for max≤3×10-3 with α=0.10±0.02 and A/A'=0.48±0.03. A possible crossover between Ising and Heisenberg behaviors has been found if is increased. Thermal diffusivity data have been fitted according to the model for a uniaxial antiferromagnet with energy conservation for ≤3×10-3 with a critical exponent b=-0.11±0.02. A correction term similar to the static correction to scaling factor has been introduced in the fitting function. No anomaly has been found in thermal conductivity. © 1994 The American Physical Society.

Marinelli, M., Mercuri, F., Zammit, U., Pizzoferrato, R., Scudieri, F., & Dadarlat, D. (1994). Photopyroelectric study of specific heat, thermal conductivity, and thermal diffusivity of Cr2O3 at the Néel transition. PHYSICAL REVIEW. B, CONDENSED MATTER, 49(14), 9523-9532 [10.1103/PhysRevB.49.9523].

Photopyroelectric study of specific heat, thermal conductivity, and thermal diffusivity of Cr2O3 at the Néel transition

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

Abstract

A photopyroelectric technique has been used to simultaneously measure the critical behavior of specific heat, thermal conductivity, and thermal diffusivity of Cr2O3 at the antiferromagnetic-paramagnetic phase transition. An Ising-like behavior has been found for max≤3×10-3 with α=0.10±0.02 and A/A'=0.48±0.03. A possible crossover between Ising and Heisenberg behaviors has been found if is increased. Thermal diffusivity data have been fitted according to the model for a uniaxial antiferromagnet with energy conservation for ≤3×10-3 with a critical exponent b=-0.11±0.02. A correction term similar to the static correction to scaling factor has been introduced in the fitting function. No anomaly has been found in thermal conductivity. © 1994 The American Physical Society.
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Esperti anonimi
Settore FIS/01 - Fisica Sperimentale
Settore FIS/03 - Fisica della Materia
English
photopyroelectric technique; thermal conductivity; thermal diffusivity
Marinelli, M., Mercuri, F., Zammit, U., Pizzoferrato, R., Scudieri, F., & Dadarlat, D. (1994). Photopyroelectric study of specific heat, thermal conductivity, and thermal diffusivity of Cr2O3 at the Néel transition. PHYSICAL REVIEW. B, CONDENSED MATTER, 49(14), 9523-9532 [10.1103/PhysRevB.49.9523].
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/2108/130904
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