Deviation from the dipole-ice model in the spinel spin-ice candidate
Abstract
In spin-ice research, small variations in structure or interactions drive a multitude of different behaviors, yet the collection of known materials relies heavily on the “227” pyrochlore structure. Here, we present thermodynamic, structural, and inelastic-neutron-scattering data on a spin-ice material, MgEr2Se4, which contributes to the relatively underexplored family of rare-earth spinel chalcogenides. X-ray and neutron diffraction confirm a normal spinel structure and place Er3+ moments on an ideal pyrochlore sublattice. Measurement of crystal electric field excitations with inelastic neutron scattering confirms that the moments have perfect Ising character, and further identifies the ground-state Kramers doublet as having dipolar-octupolar form with a significant multipolar character. Heat capacity and magnetic neutron diffuse scattering have icelike features, but are inconsistent with Monte Carlo simulations of the nearest-neighbor and next-nearest-neighbor dipolar spin-ice (DSI) models. A significant remnant entropy is observed as T → 0 K, but again falls short of the full Pauling expectation for DSI, unless significant disorder is added. We show that these observations are fully in line with what has been recently reported for CdEr2Se4, and point to the importance of quantum fluctuations in these materials.
- Authors:
-
- Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS); USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS)
- OSTI Identifier:
- 1530118
- Alternate Identifier(s):
- OSTI ID: 1509504
- Grant/Contract Number:
- AC05-00OR22725; AC05-06OR23100
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 13; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Reig-i-Plessis, D., Geldern, S. V., Aczel, Adam A., Kochkov, D., Clark, B. K., and MacDougall, Gregory J. Deviation from the dipole-ice model in the spinel spin-ice candidate MgEr2Se4. United States: N. p., 2019.
Web. doi:10.1103/PhysRevB.99.134438.
Reig-i-Plessis, D., Geldern, S. V., Aczel, Adam A., Kochkov, D., Clark, B. K., & MacDougall, Gregory J. Deviation from the dipole-ice model in the spinel spin-ice candidate MgEr2Se4. United States. https://doi.org/10.1103/PhysRevB.99.134438
Reig-i-Plessis, D., Geldern, S. V., Aczel, Adam A., Kochkov, D., Clark, B. K., and MacDougall, Gregory J. Fri .
"Deviation from the dipole-ice model in the spinel spin-ice candidate MgEr2Se4". United States. https://doi.org/10.1103/PhysRevB.99.134438. https://www.osti.gov/servlets/purl/1530118.
@article{osti_1530118,
title = {Deviation from the dipole-ice model in the spinel spin-ice candidate MgEr2Se4},
author = {Reig-i-Plessis, D. and Geldern, S. V. and Aczel, Adam A. and Kochkov, D. and Clark, B. K. and MacDougall, Gregory J.},
abstractNote = {In spin-ice research, small variations in structure or interactions drive a multitude of different behaviors, yet the collection of known materials relies heavily on the “227” pyrochlore structure. Here, we present thermodynamic, structural, and inelastic-neutron-scattering data on a spin-ice material, MgEr2Se4, which contributes to the relatively underexplored family of rare-earth spinel chalcogenides. X-ray and neutron diffraction confirm a normal spinel structure and place Er3+ moments on an ideal pyrochlore sublattice. Measurement of crystal electric field excitations with inelastic neutron scattering confirms that the moments have perfect Ising character, and further identifies the ground-state Kramers doublet as having dipolar-octupolar form with a significant multipolar character. Heat capacity and magnetic neutron diffuse scattering have icelike features, but are inconsistent with Monte Carlo simulations of the nearest-neighbor and next-nearest-neighbor dipolar spin-ice (DSI) models. A significant remnant entropy is observed as T → 0 K, but again falls short of the full Pauling expectation for DSI, unless significant disorder is added. We show that these observations are fully in line with what has been recently reported for CdEr2Se4, and point to the importance of quantum fluctuations in these materials.},
doi = {10.1103/PhysRevB.99.134438},
journal = {Physical Review B},
number = 13,
volume = 99,
place = {United States},
year = {Fri Apr 26 00:00:00 EDT 2019},
month = {Fri Apr 26 00:00:00 EDT 2019}
}
Web of Science
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Works referencing / citing this record:
Neutron scattering measurement of crystalline-electric fields in magnesium rare-earth selenide spinels
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A neutron scattering measurement of crystalline-electric fields in magnesium rare-earth selenide spinels
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