Pulsed NMR in the nuclear spin ordered phases of solid 3He in a silver sinter

Erwin A. Schuberth, Carmen Millan-Chacartegui, Stephan Schöttl

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To obtain the exact spin structure of the nuclear magnetically ordered phases of solid 3He, which in the bcc lattice are the U2D2 and the high field phase, both occurring below about 1 mK, we started a project of neutron scattering at the Hahn-Meitner Institut, Berlin. This experiment faces three main difficulties: to grow a single crystal within the sinter needed for cooling, to cool the solid to temperatures below 1 mK (or even much lower in the case of the hcp lattice), and to keep it there long enough, even under neutron irradiation. As a first step we have performed pulsed NMR measurements in the ordered phases of solid 3He in a Ag sinter of 700 Å particle size down to temperatures of 400 μK at various molar volumes. The samples remained in the ordered state for as long as 140 h. In the low field phase a strong reduction of the Larmor line to nearly zero intensity was observed. With a sample grown over 6 h at the melting curve around 50 bars three lines at the Larmor frequency and on its high frequency side were observed which seem to indicate a partly crystalline U2D2 phase in our sinter. The origin of the strong intensity drop, however, is not clear and needs further investigation.

Original languageEnglish
Pages (from-to)637-642
Number of pages6
JournalJournal of Low Temperature Physics
Issue number1-2
StatePublished - Jan 2004
Externally publishedYes


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