Magnetocaloric Study of S=1/2 Low-Dimensional Heisenberg Antiferromagnet [Cu(phen)(H_2O)_2]SO_4

• Authors: L. Sedláková , M. Orendáč , M. Kajňaková , A. Orendáčová , A. Feher
• Languages of publication: EN

Abstracts

EN

We present the experimental study of magnetocaloric effect on powder sample [Cu(phen)(H_2O)_2]SO_4 (phen = phenantroline = C_{12}H_8N_2) in the temperature range from nominally 0.2 K to 4 K and in magnetic fields up to 2 T. The values of total entropy were extracted from the experimental data obtained by adiabatic demagnetization. The comparison was performed with the temperature dependence of the entropy for S=1/2 paramagnet calculated at selected magnetic fields. The deviations observed below 0.6 T were attributed to internal field mediated by exchange coupling. In addition, the temperature response observed in [Cu(phen)(H_2O)_2]SO_4 revealed very short relaxation time below 1 K. The comparison of the behavior observed at the end of the demagnetization in [Cu(phen)(H_2O)_2]SO_4 and other systems suggests that the magnetocaloric effect can serve as an alternative tool for studying slow magnetic relaxation.

Keywords

EN

75.30.Sg; 75.50.Ee

Discipline

• 75.50.Ee: Antiferromagnetics
• 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: 473-476

Dates

published

2008-01

received

2007-07-09

Contributors

author

L. Sedláková

• Centre of Low Temperature Physics, Faculty of Science, P.J. Šafárik University and Institute of Physics, SAS, Park Angelinum 9, 041 54 Košice, Slovakia

author

M. Orendáč

• Centre of Low Temperature Physics, Faculty of Science, P.J. Šafárik University and Institute of Physics, SAS, Park Angelinum 9, 041 54 Košice, Slovakia

author

M. Kajňaková

• Centre of Low Temperature Physics, Faculty of Science, P.J. Šafárik University and Institute of Physics, SAS, Park Angelinum 9, 041 54 Košice, Slovakia

author

A. Orendáčová

• Centre of Low Temperature Physics, Faculty of Science, P.J. Šafárik University and Institute of Physics, SAS, Park Angelinum 9, 041 54 Košice, Slovakia

author

A. Feher

• Centre of Low Temperature Physics, Faculty of Science, P.J. Šafárik University and Institute of Physics, SAS, Park Angelinum 9, 041 54 Košice, Slovakia

References

• 1. M.E. Zhitomirsky, Phys. Rev. B 67, 104421 (2003)
• 2. M. Kajňaková, A. Orendáčová, M. Orendáč, J.-H. Park, O.V. Kravchyna, A.G. Anders, J. Černak, A. Feher, M.W. Meisel, J. Magn. Magn. Mater. 272, 867 (2004)
• 3. A.A. Aligia, C.D. Batista, F.H.L. Eßler, Phys. Rev. B 62, 3259 (2000)
• 4. D. De Klerk, Physica 12, 513 (1949)
• 5. M. Orendáč, J. Hanko, E.Čižmar, A. Orendáčová, M. Shirai, S.T. Bramwell, Phys. Rev. B 75, 104425 (2007)

Identifiers

DOI

10.12693/APhysPolA.113.473