Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo2
Abstract
The nature of multiple magnetostructural transformations in HoCo2 has been studied by employing magnetic and specific heat measurements, temperature and magnetic field dependent X-ray powder diffraction, and first-principles calculations. Unexpected increase of magnetization observed below the spin-reorientation temperature (TSR) suggests that the low-temperature transition involves a reduction of Co moment. First principles calculations confirm that the paramagnetic cubic to ferrimagnetic tetragonal transformation at TC is assisted by itinerant electron metamagnetism, and that the reduction of Co moment in HoCo2 occurs in parallel with the ferrimagnetic tetragonal to the nearly ferromagnetic orthorhombic transformation at TSRvia the rearrangement of both 3d states of Co and 5d states of Ho. The ac magnetic susceptibility measurements show significant magnetic frustration below TC. Furthermore, in contrast to earlier reports neither ac nor dc magnetic susceptibilities show anomalies in the paramagnetic region obeying the Curie–Weiss law.
- Authors:
-
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1254310
- Report Number(s):
- IS-J-8979
Journal ID: ISSN 2050-7526; JMCCCX
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Materials Chemistry C
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 20; Journal ID: ISSN 2050-7526
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Mudryk, Y., Paudyal, D., Pathak, A. K., Pecharsky, V. K., and Gschneidner, Jr., K. A. Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo2. United States: N. p., 2016.
Web. doi:10.1039/C6TC00867D.
Mudryk, Y., Paudyal, D., Pathak, A. K., Pecharsky, V. K., & Gschneidner, Jr., K. A. Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo2. United States. https://doi.org/10.1039/C6TC00867D
Mudryk, Y., Paudyal, D., Pathak, A. K., Pecharsky, V. K., and Gschneidner, Jr., K. A. Wed .
"Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo2". United States. https://doi.org/10.1039/C6TC00867D. https://www.osti.gov/servlets/purl/1254310.
@article{osti_1254310,
title = {Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo2},
author = {Mudryk, Y. and Paudyal, D. and Pathak, A. K. and Pecharsky, V. K. and Gschneidner, Jr., K. A.},
abstractNote = {The nature of multiple magnetostructural transformations in HoCo2 has been studied by employing magnetic and specific heat measurements, temperature and magnetic field dependent X-ray powder diffraction, and first-principles calculations. Unexpected increase of magnetization observed below the spin-reorientation temperature (TSR) suggests that the low-temperature transition involves a reduction of Co moment. First principles calculations confirm that the paramagnetic cubic to ferrimagnetic tetragonal transformation at TC is assisted by itinerant electron metamagnetism, and that the reduction of Co moment in HoCo2 occurs in parallel with the ferrimagnetic tetragonal to the nearly ferromagnetic orthorhombic transformation at TSRvia the rearrangement of both 3d states of Co and 5d states of Ho. The ac magnetic susceptibility measurements show significant magnetic frustration below TC. Furthermore, in contrast to earlier reports neither ac nor dc magnetic susceptibilities show anomalies in the paramagnetic region obeying the Curie–Weiss law.},
doi = {10.1039/C6TC00867D},
journal = {Journal of Materials Chemistry C},
number = 20,
volume = 4,
place = {United States},
year = {Wed Apr 13 00:00:00 EDT 2016},
month = {Wed Apr 13 00:00:00 EDT 2016}
}
Web of Science
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