Magnetic Properties and Crystal-Structure Transformation of the Ordered Alloy (MnRh)
- 1 April 1963
- journal article
- conference paper
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 34 (4), 1095-1096
- https://doi.org/10.1063/1.1729384
Abstract
The magnetization and electrical resistivity of the ordered alloy MnRh were measured during a complete temperature cycle between 4.2° and 700°K. At all temperatures the magnetization is proportional to field. From 700°K down to about 170°K, the susceptibility rises according to a Curie‐Weiss relation, χ=C(T−θ)−1, where θ≃−260°K and C gives an average effective atomic moment of about 3.3 μB, and the resistivity decreases slowly, yielding a large spin‐disorder term, about 85 μΩ‐cm, when extrapolated linearly to 0°K. This classical paramagnetic behavior is identified with the ordered cubic (CsCl‐type) phase of this alloy. Below 170°K the susceptibility and resistivity decrease very rapidly and then gradually level off at lower temperatures, reaching values of about 5×10−6 emu/g and 6 μΩ‐cm, respectively, at 4.2°K. The subsequent return of these properties to their original values at higher temperatures reveals a large temperature hysteresis in this transition. It is discovered from x‐ray diffraction measurements below room temperature that this transition corresponds to a transformation to an ordered tetragonal (CuAu‐type) structure, accompanied by a density increase of over 2%. The small temperature‐independent susceptibility and small residual resistivity of this low‐temperature tetragonal form of MnRh suggest it is a strong antiferromagnet.Keywords
This publication has 3 references indexed in Scilit:
- Anomalous Magnetic Moments and Transformations in the Ordered Alloy FeRhJournal of Applied Physics, 1962
- Magnetic Structure Work at the Nuclear Center of GrenobleJournal of Applied Physics, 1962
- The antiferromagnetic structure of NiMnJournal of Physics and Chemistry of Solids, 1959