ADIABATIC DEMAGNETIZATION WITH YTTRIUM-RARE EARTH ALLOYS
Alloys of yttnium with 0.3 and 1.0 at.% gadolinium, 1.0 at.% dysprosium, and 0.6 and 1.0 at.% holmium were investigated to determine their usefulness as the working substance for adisbatic demagnetization. In addition, single crystals of 0.6 and 1.0 at.% holndum-yttnium alloys were studied. Those alloys that exhibited paramagnetic susceptibility behavior in the temperature range 1.2 to 4.2 deg K were demagnetized adiabatically from about 11 kgauss and 1.25 deg K. The lowest temperature attained was 0.76 deg K for the single crystal of 1.0 at.% holntium with the magnetic field parallel to the a axis of the hexsgonal crystal. Magnetization measurements obtained for the single crystals in the temperature range 1.2 to 4.2 deg K indicated strong anisotropy with the a axis as the most effective axis of magnetization. Hysteresis was observed in the magnetization of 1.0 at.% holndum single crystal with the a axis parallel to the fleld. Entropy removal during magnetization was calculated from the magnetization data for the single crystals and found to be only about 15% of that expected if the alloy behaved like an ideal paramagnetic substance. (auth)
- Research Organization:
- Ames Lab., Ames, Iowa
- NSA Number:
- NSA-15-024018
- OSTI ID:
- 4036828
- Report Number(s):
- IS-244; 0031-899X
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D , Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 123; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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