Direct demagnetization cooling of high-density solid He3

Tohru Okamoto, Hiroshi Fukuyama, Hikota Akimoto, Hidehiko Ishimoto, and Shinji Ogawa
Phys. Rev. Lett. 72, 868 – Published 7 February 1994
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Abstract

Nuclear adiabatic demagnetization has been done for both hcp and bcc solid He3 with exchange interactions of the order of 10 μK. Observed isochoric pressure increase during the demagnetization for the bcc sample at a molar volume of 19.99 cm3/mol showed clear magnetic transitions at the upper and the lower critical fields as is known for lower density solids. On the other hand, no pressure increase was observed for the hcp sample at 19.07 cm3/mol down to a zero magnetic field. These observations give strong evidence that the ground state in hcp He3 is ferromagnetic.

  • Received 19 July 1993

DOI:https://doi.org/10.1103/PhysRevLett.72.868

©1994 American Physical Society

Authors & Affiliations

Tohru Okamoto, Hiroshi Fukuyama, Hikota Akimoto, Hidehiko Ishimoto, and Shinji Ogawa

  • Institute for Solid State Physics, University of Tokyo, Roppongi, Tokyo 106, Japan

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Vol. 72, Iss. 6 — 7 February 1994

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