SPECIFIC HEAT OF THE QUASI 2D-XY HELIMAGNETS BaCo2(AsO4)2 AND BaCo2 (PO4)2

L. Regnault , J. Rossat-Mignod , J. Villain , A. de Combarieu

We measured the magnetic specific heat of two quasi-two-dimensional (2-D), XY helimagnets, BaCo2 (AsO4)2 and BaCo2(PO4)2. At temperatures T < 2 K, C is proportional to T2 as expected from spin wave theory. At higher temperatures C has an exponential form characteristic of a potential barrier. The specific heat of BaCo2 (AsO4)2 exhibits a sharp anomaly at TN = 5.29 K whereas only a bump is observed around 5.5 K in BaCo2(PO4)2.

Domaines: Articles anciens

L. Regnault, J. Rossat-Mignod, J. Villain, A. de Combarieu. SPECIFIC HEAT OF THE QUASI 2D-XY HELIMAGNETS BaCo2(AsO4)2 AND BaCo2 (PO4)2. Journal de Physique Colloques, 1978, 39 (C6), pp.C6-759-C6-761. ⟨10.1051/jphyscol:19786339⟩. ⟨jpa-00217789⟩