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Title: Unexpected crystal and magnetic structures in MnCu4In and MnCu4Sn

Abstract

We discovered a new compound MnCu4In with its own hexagonal structure type (hP12-P63mc, ternary ordered derivative of the hexagonal MgZn2-type) that becomes ferromagnetic at TC = 540 K. This transition temperature is higher than that found in the MnCu2In and MnCu2Sn alloys. In contrast, the homologous compound MnCu4Sn, which crystallizes in the cubic MgCu4Sn-type, orders antiferromagnetically with TN = 110 K. The neutron diffraction studies show ferromagnetic spin orientation in the {1 0 1} plane in MnCu4In with a magnetic moment of 4.5 μB/Mn at 22 K, and a corresponding value of 4.7 μB/Mn in the antiferromagnetic MnCu4Sn with propagation vector View the MathML source. The first-principles electronic structure calculations show that the unexpected difference in both magnetic and crystal structures of MnCu4In and MnCu4Sn is due to the difference in the Mn-3d bands and exchange interactions relating to different crystal anisotropy, coordination numbers, and interatomic distances.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1096858
Report Number(s):
IS-J 7964
Journal ID: 1359-6454
DOE Contract Number:  
DE-AC02-07CH11358
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 61; Journal Issue: 6
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Copper alloys; Crystallography; Ferromagnetic shape memory alloy; Heusler alloys; Magnetic properties

Citation Formats

Provino, A, Paudyal, D, Fornasini, ML, Dhiman, I, Dhar, SK, Das, A, Mudryk, Y, Manfrinetti, P, and Pecharsky, VK. Unexpected crystal and magnetic structures in MnCu4In and MnCu4Sn. United States: N. p., 2013. Web. doi:10.1016/j.actamat.2012.12.043.
Provino, A, Paudyal, D, Fornasini, ML, Dhiman, I, Dhar, SK, Das, A, Mudryk, Y, Manfrinetti, P, & Pecharsky, VK. Unexpected crystal and magnetic structures in MnCu4In and MnCu4Sn. United States. https://doi.org/10.1016/j.actamat.2012.12.043
Provino, A, Paudyal, D, Fornasini, ML, Dhiman, I, Dhar, SK, Das, A, Mudryk, Y, Manfrinetti, P, and Pecharsky, VK. 2013. "Unexpected crystal and magnetic structures in MnCu4In and MnCu4Sn". United States. https://doi.org/10.1016/j.actamat.2012.12.043.
@article{osti_1096858,
title = {Unexpected crystal and magnetic structures in MnCu4In and MnCu4Sn},
author = {Provino, A and Paudyal, D and Fornasini, ML and Dhiman, I and Dhar, SK and Das, A and Mudryk, Y and Manfrinetti, P and Pecharsky, VK},
abstractNote = {We discovered a new compound MnCu4In with its own hexagonal structure type (hP12-P63mc, ternary ordered derivative of the hexagonal MgZn2-type) that becomes ferromagnetic at TC = 540 K. This transition temperature is higher than that found in the MnCu2In and MnCu2Sn alloys. In contrast, the homologous compound MnCu4Sn, which crystallizes in the cubic MgCu4Sn-type, orders antiferromagnetically with TN = 110 K. The neutron diffraction studies show ferromagnetic spin orientation in the {1 0 1} plane in MnCu4In with a magnetic moment of 4.5 μB/Mn at 22 K, and a corresponding value of 4.7 μB/Mn in the antiferromagnetic MnCu4Sn with propagation vector View the MathML source. The first-principles electronic structure calculations show that the unexpected difference in both magnetic and crystal structures of MnCu4In and MnCu4Sn is due to the difference in the Mn-3d bands and exchange interactions relating to different crystal anisotropy, coordination numbers, and interatomic distances.},
doi = {10.1016/j.actamat.2012.12.043},
url = {https://www.osti.gov/biblio/1096858}, journal = {Acta Materialia},
number = 6,
volume = 61,
place = {United States},
year = {Tue Jan 29 00:00:00 EST 2013},
month = {Tue Jan 29 00:00:00 EST 2013}
}