Observation of spin-lattice coupling in the critical region of

S. V. Grigoriev; S. V. Maleyev; A. I. Okorokov; H. Eckerlebe

doi:10.1209/epl/i2003-00477-3

All issues

Volume 63 / No 1 (July 2003)

Europhys. Lett., 63 1 (2003) 56-62

Abstract

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

Europhys. Lett., 63 (1), pp. 56-62 (2003)

Observation of spin-lattice coupling in the critical region of $\chem{Fe_{65}Ni_{35}}$

S. V. Grigoriev¹, S. V. Maleyev¹, A. I. Okorokov¹ and H. Eckerlebe²

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

Abstract

The nuclear-magnetic interference in the critical small-angle scattering of polarized neutrons from invar $\chem{Fe_{65}Ni_{35}}$ near $T_{\ab{C}}=485$ $\un{K}$ 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 $(\delta a/a)\approx 0.004$ . The range of this expansion is of order 50 $\un{\AA}$ 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 – $\chem{Fe}$ and its alloys

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