Magnetocaloric Effect in Geometrically Frustrated Magnetic Compound HoB12

J.L. Snyman a, K. Flachbartb, S. Gabani b, M. Reiffers b, N. Shitsevalova c, K. Siemensmeyer d and A.M. Strydom a aPhysics Department, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa bInstitute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, SK-04001 Kosice, Slovak Republic cI. Frantsevich Inst. for Problems of Materials Science of NASU, 3 Krzhyzhanovsky Str., UA-03680 Kiev, Ukraine dHelmholtz Zentrum Berlin, Glienicker Str. 100, D-14109 Berlin, Germany

Full Text PDF

The magnetocaloric effect of frustrated antiferromagnetic HoB12 is calculated. The isothermal entropy change Δ S characterising the magnetocaloric effect shows a small positive change upon magnetisation below the transition temperature TN, indicating a small inverse magnetocaloric effect. At TN, Δ S shows clear scaling behaviour with the applied magnetic field. The adiabatic temperature change Δ T shows paramagnetic behaviour above TN, despite strong magnetic correlations that persist in this temperature region. The adiabatic temperature change calculated for HoB12 is appreciable.

DOI: 10.12693/APhysPolA.118.873 PACS numbers: 75.30.Sg, 75.40.Cx