Magnetic properties, phase diagram and low-temperature specific heat of Ni₅₀Mn_50-xSb_x alloys

Autor(en)

Anna Kosogor, Rie Y. Umetsu, Vladimir Golub, Xiao Xu, Ryosuke Kainuma

Abstrakt

This study examines the magnetic properties and temperature-composition phase diagram of the Ni50Mn50-xSbx alloys. The addition of Sb into the antiferromagnetic Ni50Mn50 alloy introduces ferromagnetic interaction, resulting in a sudden decrease in the Néel temperature. The characteristic regions of ferromagnetic (FM) and antiferromagnetic (AFM) interactions were determined on temperature-composition phase diagram, as well as compositional dependence of Néel temperature was computed. Increase of Sb content gives rise to an interplay between AFM and FM interactions, leading to the emergence of a spin glass-like state. We identified six distinct magnetic phases in the Ni50Mn50-xSbx system, encompassing AFM, paramagnetic, and FM martensite, as well as spin glass, and paramagnetic and FM austenite. Importantly, this behavior may extend to other Ni50Mn50-xZx (Z = In, Sn) alloys, where addition of Z elements leads to the introduction of FM interaction. Moreover, a significant impact of magnetic ordering on low-temperature specific heat is demonstrated. Neglecting the magnetic contribution in ferromagnetic phase leads to the overestimation of electronic specific heat coefficient by factor of 2.

Organisation(en)

Physik Funktioneller Materialien

Externe Organisation(en)

Tohoku University, National Academy of Sciences of Ukraine (NASU)

Journal

Journal of Alloys and Compounds

Band

988

Anzahl der Seiten

9

ISSN

0925-8388

DOI

https://doi.org/10.1016/j.jallcom.2024.174130

Publikationsdatum

06-2024

Peer-reviewed

Ja

ÖFOS 2012

103017 Magnetismus

Schlagwörter

ASJC Scopus Sachgebiete

Mechanics of Materials, Mechanical Engineering, Metals and Alloys, Materials Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/4139b786-85e0-430d-a572-a969e8d1a327