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Morin-type transition in 5C pyrrhotite by Charles R.S. Haines; Giulio I. Lampronti; Wim T. Klooster; Simon J. Coles; Sian E. Dutton; Michael A. Carpenter is a Earth and Planetary Sciences article available to read on EtoBox.

What is Morin-type transition in 5C pyrrhotite about?

## Abstract We report the discovery of a low-temperature spin-flop transition in 5C pyrrhotite at ~155 K that is similar to those seen in hematite at 260 K and FeS (troilite) at 440 K. The 5C crystal was produced by annealing a 4C pyrrhotite crystal at 875 K to produce a change in the vacancy-ordering scheme that developed during cooling. The 5C structure is confirmed by single-crystal X-ray diffraction and the stoichiometry and homogeneity by electron microprobe and SEM BSE mapping. Resonant ultrasound spectroscopy (RUS), heat capacity, and magnetization measurements from room temperature down to 2 K are reported. The transition is marked by a steep change in elastic properties at the transition temperature, a peak in the heat capacity, and weak anomalies in measurements of magnetization. Magnetic hysteresis loops and comparison with the magnetic properties of 4C pyrrhotite suggest that the transition involves a change in orientation of moments between two different antiferromagnetic structures, perpendicular to the crystallographic c-axis at high temperatures and parallel to the crystal-lographic c-axis at low temperatures. The proposed structures are consistent with a group theo

Who reads Morin-type transition in 5C pyrrhotite?

Author

Charles R.S. Haines; Giulio I. Lampronti; Wim T. Klooster; Simon J. Coles; Sian E. Dutton; Michael A. Carpenter

Publisher

Mineralogical Society of America; Walter de Gruyter GmbH (ISSN 0003-004X)

Published

2020

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)