Nanocluster molecular magnetic gels in superfluid helium: cold neutron scattering
An oxygen gel sample could be prepared by condensation of the helium gas with small impurity of molecular O2 on the surface of superfluid He-II. Based on results of SANS studies of the oxygen gel sample at D22 diffractometer and subsequent theoretical estimations, we conclude that if the cell with an oxygen sample at the temperature below 1.8 K were placed in an external magnetic field H>200 Gs than the magnetic structure of the nanocluster backbone should be close to ferromagnetic, substantially different from that in the bulk impurity substance. In order to check this conclusion, we propose to perform a set of SANS measurements with oxygen (and heavy water for comparison) gel samples at D33 instrument. Magnetic field would be provided using external electromagnetic coils. Cold neutrons should be spin-polarized. In addition to studying nanostructured gel samples we would like also to measurefine-grained icy structures formed after decaying the gel on heating in the magnetic field of up to 800 Gs. Samples would be grown in-situ in our specialized cryostat. This study could open new options for expanding our knowledge on properties of molecular cluster magnets.
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MEZHOV DEGLIN Leonid P.; DEWHURST Charles; EFIMOV Victor; LOKHOV Alexander; NESVIZHEVSKY Valery and PORCAR Lionel. (2014). Nanocluster molecular magnetic gels in superfluid helium: cold neutron scattering. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-801
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