Neutron experiments on antiferromagnetic nuclear order in silver at picokelvin temperatures

J.T. Tuoriniemi, K.K. Nummila, R.T. Vuorinen, O.V. Lounasmaa, A. Metz, K. Siemensmeyer, M. Steiner, K. Lefmann, K.N. Clausen, F.B. Rasmussen

    Research output: Contribution to journalJournal articleResearch

    Abstract

    Spontaneous long-range nuclear antiferromagnetic order in the spin-1/2 system of silver nuclei was observed by neutron diffraction on a single crystal of Ag-109. A structure with the ordering vector k = (2 pi/a) (0,0,1) developed when the antiferromagnetic state was entered by adiabatic demagnetization along the [001] axis. No domains of the other two symmetry-equivalent k vectors, (2 pi/a) (0,1,0) and (2 pi/a) (1,0,0), formed during warmup in zero field. Nuclear susceptibility and entropy were found by neutron transmission. In B = 0, the critical entropy of ordering was S-c = (0.54 +/- 0.03)R ln2.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume75
    Issue number20
    Pages (from-to)3744-3747
    ISSN0031-9007
    DOIs
    Publication statusPublished - 1995

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