Book/Report

FZJ-2018-00482

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Feld induzierte magnetische Phasenübergänge an Hämatit-($\alpha$-Fe$_{2}$O$_{3}$)-Einkristallen : Eine Neutronenbeugungsuntersuchung

Hönigschmid, J. (Corresponding author)FZJ*

1975
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/16584

Report No.: Juel-1233

Abstract: The magnetic structure of single crystals of hematite was studied in magnetic fields above and below the second magnetic phase transition (Morin-transition) by means of elastic neutron diffraction. The dependence of the phase transition on temperaturr (from 220 K to 265 K) and on fieldstrength (up to 70 kG) yields a value of 9.6 $\cdot$ 10$^{5}$ erg/cm$^{3}$ fpr the latent heat of the Morintransition. The results are compared with the phenomenological theory of Dzyaloshinskii. From experiments in which we aplly the field in two different directions in the trigonal basal plane (parallel and perpendicular) to one of the twofold axis) we find trigonal domains above the Morin-transition. These domains disappear at fields higher than 10 kG. Below the Morin-transition one finds two domains when ac external field is applied. The two magnetisation directions have a mirror plane, which is given from the direction of the external magnetic field and the trigonal axis. The moments remain in a plane perpendicular to the field during the field-induced movement. The superconducting magnet and the gas flow insert cryostat is described.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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Database coverage:

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