Nuclear Spin Ordering on the Surface of a $^{3}\mathrm{He}$ Crystal: Magnetic Steps

Nuclear Spin Ordering on the Surface of a ${}^{3}{He}$ Crystal: Magnetic Steps

I. A. Todoshchenko, H. Alles, H. J. Junes, M. S. Manninen, and A. Ya. Parshin

Phys. Rev. Lett. 102, 245302 – Published 18 June 2009

Abstract

The growth rates of the (110) and (100) facets on bcc ${}^{3}{He}$ crystals have been measured near the magnetic ordering transition at $T_{N} = 0.93 mK$ . In the ordered phase, we have observed several growth modes which correspond to different values of the step energy. We show that, because of quantum delocalization, the step induces a cluster of ferromagnetically ordered nuclear spins. The free energy of such a cluster is relatively large and depends on the orientation of the underlying antiferromagnetic domain. In the paramagnetic phase, the mobilities of the basic facets are greatly reduced because of the much slower spin diffusion in the bulk solid.

Received 21 April 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.245302

Authors & Affiliations

I. A. Todoshchenko, H. Alles^*, H. J. Junes, M. S. Manninen, and A. Ya. Parshin^†

Low Temperature Laboratory, Helsinki University of Technology, P. O. Box 5100, 02015 TKK, Finland

^*Present address: Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia.
^†Present address: P. L. Kapitza Institute, Kosygina 2, Moscow 119334, Moscow Institute for Physics and Technology, Institutskii 9, Dolgoprudnyi 141700, Russia.

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Vol. 102, Iss. 24 — 19 June 2009

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Physical Review Letters

Nuclear Spin Ordering on the Surface of a He3 Crystal: Magnetic Steps

I. A. Todoshchenko, H. Alles, H. J. Junes, M. S. Manninen, and A. Ya. Parshin

Phys. Rev. Lett. 102, 245302 – Published 18 June 2009

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Nuclear Spin Ordering on the Surface of a ${}^{3}{He}$ Crystal: Magnetic Steps