Deviation from the dipole-ice model in the spinel spin-ice candidate MgEr2Se4

Reig-i-Plessis, D.; Geldern, S. V.; Aczel, Adam A.; Kochkov, D.; Clark, B. K.; MacDougall, Gregory J.

doi:10.1103/PhysRevB.99.134438

Title: Deviation from the dipole-ice model in the spinel spin-ice candidate ${MgEr}_{2} {Se}_{4}$

Journal Article · Fri Apr 26 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.134438· OSTI ID:1530118

Reig-i-Plessis, D. ^[1]; Geldern, S. V. ^[1];

^[2]; Kochkov, D. ^[1]; Clark, B. K. ^[1]; MacDougall, Gregory J. ^[1]

Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: 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)

Grant/Contract Number:: AC05-00OR22725; AC05-06OR23100

OSTI ID:: 1530118

Alternate ID(s):: OSTI ID: 1509504

Journal Information:: Physical Review B, Vol. 99, Issue 13; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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Title: Deviation from the dipole-ice model in the spinel spin-ice candidate ${MgEr}_{2} {Se}_{4}$