We investigate the complex magnetic behavior of LaFe12B6 by means of magnetostriction, and thermal expansion measurements in applied fields of up to 14 T, elucidating the interplay between crystal lattice and spins. As main results, we have discovered a remarkably large negative thermal expansion (NTE) and giant magnetostriction in this itinerant-electron system. Of particular interest are the low-temperature magnetostriction isotherms (T ≤ 5 K) all of which reach saturation discontinuously, by way of ultrasharp multistep transitions. These are rather unusual kind of first-order phase transitions. By contrast, the field-dependent magnetostriction varies smoothly at temperatures exceeding 5 K. A huge positive magnetostrictive effect of ΔV/V (20 K, 14 T) = 0.87% accompanies the field-induced first-order metamagnetic transition. In the vicinity of the Curie point, a magnetically driven giant NTE phenomenon with an average linear thermal expansion coefficient αL = −27 × 10−6 K−1 is observed.
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8 May 2023
Research Article|
May 08 2023
Giant magnetostriction effect in LaFe12B6 metamagnet
L. V. B. Diop
;
L. V. B. Diop
a)
(Conceptualization, Formal analysis, Project administration, Resources, Visualization, Writing – original draft, Writing – review & editing)
1
Université de Lorraine, CNRS
, IJL, F-54000 Nancy, France
a)Author to whom correspondence should be addressed: leopold.diop@univ-lorraine.fr
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J. Prokleška
;
J. Prokleška
(Data curation, Resources, Writing – original draft)
2
Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics
, Ke Karlovu 5, Prague, Czech Republic
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O. Isnard
O. Isnard
(Project administration, Resources, Writing – review & editing)
3
Institut NEEL, Université Grenoble Alpes, CNRS
, 25 rue des martyrs, F-38042 Grenoble, France
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a)Author to whom correspondence should be addressed: leopold.diop@univ-lorraine.fr
Appl. Phys. Lett. 122, 192402 (2023)
Article history
Received:
January 29 2023
Accepted:
April 22 2023
Citation
L. V. B. Diop, J. Prokleška, O. Isnard; Giant magnetostriction effect in LaFe12B6 metamagnet. Appl. Phys. Lett. 8 May 2023; 122 (19): 192402. https://doi.org/10.1063/5.0144348
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