| Issue |
Europhys. Lett.
Volume 63, Number 1, July 2003
|
|
|---|---|---|
| Page(s) | 56 - 62 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00477-3 | |
| Published online | 01 June 2003 | |
Observation of spin-lattice coupling in the critical
region of 
1
Petersburg Nuclear Physics Institute - Gatchina, St. Petersburg 188300, Russia
2
GKSS Forchungszentrum - 21502 Geesthacht, Germany
Corresponding author: grigor@pnpi.spb.ru
Received:
4
July
2002
Accepted:
8
May
2003
The nuclear-magnetic interference in the critical small-angle
scattering of polarized neutrons from invar
near 
was investigated. The interference
caused by the spin-lattice coupling revealed the correlation
between critical fluctuations of magnetization and fluctuations
of the nuclear density. The magnetic scattering allowed one to
unambiguously identify a shape of the scattering objects as one
of the critical fluctuation. The q-dependence of the
interference scattering revealed that the shape of the scattering
nuclear objects is essentially the same as the magnetic one.
Therefore, the shape and lifetime of the scattering nuclear
object are correlated with and terminated by that of the magnetic
fluctuation. It was found that the expansion of the lattice is
. The range of this expansion is of
order 50
and depends on the temperature and magnetic
field.
PACS: 61.12.Ex – Neutron scattering techniques (including
small-angle scattering) / 75.40.-s – Critical-point effects, specific heats, short-range order / 75.50.Bb – 
and its alloys
© EDP Sciences, 2003
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