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;
1994-01-01
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.File | Dimensione | Formato | |
---|---|---|---|
1994 PhysRevB PHOTOPYROELECTRIC.pdf
solo utenti autorizzati
Descrizione: Articolo principale
Licenza:
Copyright dell'editore
Dimensione
585.57 kB
Formato
Adobe PDF
|
585.57 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.