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Title: Lattice instability and magnetic phase transitions in strongly correlated MnAs

Journal Article · · Journal of Physics. Condensed Matter
ORCiD logo [1];  [1];  [2];  [3]
  1. Central Michigan University, Mount Pleasant, MI (United States)
  2. Central Michigan University, Mount Pleasant, MI (United States); Gandhi Institute of Technology and Management (GITAM), Andhra Pradesh (India)
  3. Brookhaven National Laboratory (BNL), Upton, NY (United States)

Using variable temperature x-ray total scattering in magnetic field, we study the interaction between lattice and magnetic degrees of freedom in MnAs, which loses its ferromagnetic order and hexagonal ('H') lattice symmetry at 318 K to recover the latter and become a true paramagnet when the temperature is increased to 400 K. Our results show that the 318 K transition is accompanied by highly anisotropic displacements of Mn atoms that appear as a lattice degree of freedom bridging the 'H' and orthorhombic phases of MnAs. This is a rare example of a lowering of an average crystal symmetry due to an increased displacive disorder emerging on heating. Furthermore, our results also show that magnetic and lattice degrees of freedom appear coupled but not necessarily equivalent control variables for triggering phase transitions in strongly correlated systems in general and in particular in MnAs.

Research Organization:
Central Michigan Univ., Mount Pleasant, MI (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0021973; SC0012704
OSTI ID:
1991764
Alternate ID(s):
OSTI ID: 1993754
Report Number(s):
BNL-224646-2023-JAAM
Journal Information:
Journal of Physics. Condensed Matter, Vol. 35, Issue 31; ISSN 0953-8984
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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