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APS » Journals » Phys. Rev. Lett. » Volume 42 » Issue 25
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Phys. Rev. Lett. 42, 1702–1705 (1979)

Evidence for Nuclear Antiferromagnetism in Copper

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G. J. Ehnholm, J. P. Ekström, J. F. Jacquinot*, M. T. Loponen, O. V. Lounasmaa, and J. K. Soini
Low Temperature Laboratory, Helsinki University of Technology, SF-02150 Espoo 15, Finland

Received 26 March 1979; published in the issue dated 18 June 1979

We have studied, in a two-stage nuclear demagnetization cryostat, the NMR properties of copper nuclei in magnetic fields from 0 to 15 mT and at polarizations up to 0.9. In zero field the spin entropy decreases less rapidly with temperature than expected for an interacting paramagnet with a constant local field; at 50 nK the entropy is still 45% of Rln4. The temperature dependence of magnetic susceptibility points to nuclear antiferromagnetism in copper.

© 1979 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.42.1702
DOI:
10.1103/PhysRevLett.42.1702
PACS:

*On leave of absence from Centre d'Etudes Nucléaires de Saclay, 91190 Gif-sur-Yvette, France.

 
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