Magnetic Phase Transitions and Thermal Properties of Ho(Co_{1-x}Si_x)_2 Compounds

• Authors: D. Vasylyev , J. Prokleška , V. Sechovský
• Languages of publication: EN

Abstracts

EN

The specific heat of HoCo_2 and Ho(Co_{0.95}Si_{0.05})_2 was measured as a function of temperature in several constant magnetic fields up to 8 T. A data analysis allowed us to determine the isothermal entropy change and the magnetocaloric effect in a wide temperature range. The considerable values of the magnetocaloric effect in the vicinity of the magnetic ordering transition are qualifying both compounds as suitable for magnetic refrigeration purposes. The magnetic phase transition temperature (T_C) increases from 77 K for HoCo_2 to 103 K for Ho(Co_{0.95}Si_{0.05})_2 while the large magnetocaloric effect in the vicinity of TC is maintained, which demonstrates possible ways of tuning the operating temperatures of the magnetic refrigerant.

Keywords

EN

75.30.Sg; 75.50.Gg

Discipline

• 75.50.Gg: Ferrimagnetics
• 75.30.Sg: Magnetocaloric effect, magnetic cooling(for cryogenics, see 07.20.Mc)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 1
• Pages: 347-350

Dates

published

2008-01

received

2007-07-09

Contributors

author

D. Vasylyev

• Department of Condensed Matter Physics, Charles University, Faculty of Mathematics and Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

author

J. Prokleška

• Department of Condensed Matter Physics, Charles University, Faculty of Mathematics and Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

author

V. Sechovský

• Department of Condensed Matter Physics, Charles University, Faculty of Mathematics and Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

References

• 1. K.A. Gschneidner Jr., V.K. Pecharsky, Phys. Rev. Lett. 78, 4494 (1997)
• 2. T.D. Cuong, L. Havela, V. Sechovský, Z. Arnold, J. Kamarád, N.H. Duc, J. Alloys Comp. 262-263, 141 (1997)
• 3. O. Syshchenko, T. Fujita, V. Sechovský, M. Diviš, H. Fujii, J. Magn. Magn. Mater. 226-230, 1062 (2001)
• 4. M. Foldeaki, R. Chaine, B.R. Gopal, T.K. Bose, X.Y. Liu, J.A. Barclay, J. Appl. Phys. 83, 2727 (1998)
• 5. M.W. Zemansky, Heat and Thermodynamics, McGraw-Hill, New York 1968
• 6. N.H. Duc, D.T. Kim Anh, J. Magn. Magn. Mater. 242-245, 873 (2002)
• 7. J. Inoue, M. Shimizu, J. Phys. F 12, 1811 (1982)
• 8. W. Steiner, E. Gratz, H. Ortbauer, H.W. Camen, J. Phys. F 8, 1525 (1978)
• 9. E. Gratz., G. Hilscher, H. Kirchmayr, H. Sassik, The Rare Earths in Science and Technology, Plenum, New York 1980, p. 327

Identifiers

DOI

10.12693/APhysPolA.113.347