Thermal Properties of (DyxGd1-x)3Ga5O12 Garnet Single Crystals

  • T. Numazawa
  • H. Kimura
  • A. Sato
  • H. Maeda
  • K. Shimamura
  • T. Fukuda
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)

Abstract

The solid solution (DyxGd1-x)3Ga5O12 garnet is proposed as a high heat capacity material below 2 K for regenerator. A short range order interaction resulting from the magnetic frustration in Gd3Ga5O12 gives a considerably high heat capacity below 2 K. At a magnetic field B = ~1 T, Gd3Ga5O12 has a sharp anomaly in its specific heat at ~0.37 K related to an antiferromagnetic transition, keeping the large heat capacity. By substituting Gd ion by Dy ion, an anisotropy will be produced in (DyxGd1-x)3Ga5O12 and it enhances the antiferromagnetic long range order interactions. The specific heat measurement for (Dy0.5Gd0.5)3Ga5O12 at B = 0 T showed that heat capacity of (Dy0.5Gd0.5)3Ga5O12 is comparable largely to that of Gd3Ga5O12 and a transition temperature may be found below 0.6 K. From the thermal conductivity measurement, a strong correlation with magnetic field has been found. The reduction in the thermal conductivity caused by the magnetic field is the largest in Dy3Ga5O12 and it decreases by increasing the concentration of Gd ion.

Keywords

Phonon Scattering Magnetic Field Dependence Magnetocaloric Effect Thermal Conductivity Measurement Magnetic Refrigerant 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    J.A. Barclay and W.A. Steyert, Materials for Magnetic Refrigeration between 2 K and 20 K, Cryogenics 22:73 (1982)CrossRefGoogle Scholar
  2. 2.
    M. Sahashi, Y. Tokai, T. Kuriyama and H. Nakagome, New magnetic material R3T system with extremely large heat capacities used as heat regenerators, Adv. Cryog. Eng. 35:1175 (1989)Google Scholar
  3. 3.
    T. Hashimoto, Recent investigation on refrigerants for magnetic refrigerators, Adv. Cryog. Eng. 32:261 (1986)CrossRefGoogle Scholar
  4. 4.
    V. Kotsubo and G.W. Swift, Superfluid Refrigerator: A New Method for Cooling below 1 K, Proc. Sixth Int. Cryocoolers Conf. vol.11: 59 (1991)Google Scholar
  5. 5.
    T. Numazawa, H. Kimura, M. Sato and H. Maeda, Magnetic Refrigerants in the Temperature Range from 1 K to 4 K, Proc. 3rd Japan-Shino Joint Seminar on Small Refrigerators: 88 (1989)Google Scholar
  6. 6.
    T. Numazawa, H. Kimura, M. Sato and H. Maeda, Thermal Switch Properties of Dy3Ga5O12 Single Crystal, Cryogenic Eng. (in Japanese) 28: 592 (1993)Google Scholar
  7. 7.
    H. Kimura, T. Numazawa and M. Sato, Rare-earth distribution behavior and lattice parameter changes on rare-earth substituted garnet single crystals, J. Matt. Sci. Lett. 13:1164 (1994)CrossRefGoogle Scholar
  8. 8.
    J. Filippi, J.C. Lasjaunias, A. Ravex, F. Tcheou and J. Rossat-Mignold, Specific Heat of Dysprosium Gallium Garnet Between 37 mK and 2 K, Solid State Commun. 23:613 (1977)CrossRefGoogle Scholar
  9. 9.
    R.A. Fisher, G.E. Brodale, E.W. Hornung and W.F. Giauque, Magnetothermodynamics of gadolinium gallium garnet. I. Heat capacity, entropy, magnetic moment from 0.5 to 4.2 K, with fields to 90 kG along the [100] axis, J. Chem. Phys. 59:4652 (1973)CrossRefGoogle Scholar
  10. 10.
    P. Schiffer, A.P. Ramirez, D.A. Huse and A.J. Valentino, Investigation of the Field Induced Antiferomagnetic Phase Transition in the Frustrated Magnet: Gadolinium Gallium Garnet, Phys. Rev. Lett. 73:2500 (1994)CrossRefGoogle Scholar
  11. 11.
    G.A. Slack and D.W. Oliver, Thermal Conductivity of Garnets and Phonon Scattering by Rare-Earth Ions, Phys. Rev. 4:592(1971)CrossRefGoogle Scholar
  12. 12.
    T. Numazawa, H. Kimura and M. Sato, Phonon scattering induced by magnetic fields in (DyxGd1-x)3Ga5O12 single crystals, J. J. A. P. 34: to be publishedGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • T. Numazawa
    • 1
  • H. Kimura
    • 1
  • A. Sato
    • 1
  • H. Maeda
    • 1
  • K. Shimamura
    • 2
  • T. Fukuda
    • 2
  1. 1.Tsukuba Magnet LaboratoriesNational Research Institute for MetalsTsukuba 305Japan
  2. 2.Institute for Materials ResearchTohoku UniversitySendai 980-77Japan

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