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Title: Quantification of local Ising magnetism in rare-earth pyrogermanates Er 2 Ge 2 O 7 and Yb 2 Ge 2 O 7

Abstract

Recently, a local-Ising-type magnetic order was inferred from neutron diffraction of the antiferromagnetic Er2Ge2O7 (pg-ErGO) with an applied magnetic field. Here, we use neutron spectroscopy to investigate the energetics of pg-ErGO and the isostructural Yb2Ge2O7 (pg-YbGO) to evaluate the adequacy of the local-Ising description. To begin, we generate a model of the magnetic structure of pg-YbGO using neutron diffraction and find a net ferromagnetic moment. While pg-ErGO and pg-YbGO have highly symmetric crystal structures (P41212 tetragonal space group 92) with only one trivalent rare-earth magnetic site, the point symmetry of the rare-earth site is low with only a single symmetry element (point group C1). For both compounds, the energy scale of the first excited state is large compared to the magnetic ordering temperature, suggesting Ising character. The ground-state Kramer's doublet of both compounds is dominated by the maximal mJ component. However, the low point group symmetry of the rare-earth site leads to finite mixing of all other mJ's, which suggests potential deviations from Ising behavior. Moreover, quasielastic scattering is observed deep in the ordered state of pg-ErGO and pg-YbGO that may be due to non-Ising behavior. The dominant magnetic interaction in both compounds is found to be magnetostatic by consideringmore » the magnetic excitations in the ordered state. Lastly, from consideration of these data, the pg-YbGO is more Ising-like than pg-ErGO. Also, quantum multicritical points are anticipated with applied magnetic field in both compounds.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [1];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Clemson Univ., SC (United States)
  3. Clemson Univ., SC (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1606915
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 1; 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

Pajerowski, Daniel M., Taddei, Keith M., Sanjeewa, Liurukara D., Savici, Andrei T., Stone, Matthew B., and Kolis, Joseph W. Quantification of local Ising magnetism in rare-earth pyrogermanates Er2Ge2O7 and Yb2Ge2O7. United States: N. p., 2020. Web. https://doi.org/10.1103/PhysRevB.101.014420.
Pajerowski, Daniel M., Taddei, Keith M., Sanjeewa, Liurukara D., Savici, Andrei T., Stone, Matthew B., & Kolis, Joseph W. Quantification of local Ising magnetism in rare-earth pyrogermanates Er2Ge2O7 and Yb2Ge2O7. United States. https://doi.org/10.1103/PhysRevB.101.014420
Pajerowski, Daniel M., Taddei, Keith M., Sanjeewa, Liurukara D., Savici, Andrei T., Stone, Matthew B., and Kolis, Joseph W. Wed . "Quantification of local Ising magnetism in rare-earth pyrogermanates Er2Ge2O7 and Yb2Ge2O7". United States. https://doi.org/10.1103/PhysRevB.101.014420. https://www.osti.gov/servlets/purl/1606915.
@article{osti_1606915,
title = {Quantification of local Ising magnetism in rare-earth pyrogermanates Er2Ge2O7 and Yb2Ge2O7},
author = {Pajerowski, Daniel M. and Taddei, Keith M. and Sanjeewa, Liurukara D. and Savici, Andrei T. and Stone, Matthew B. and Kolis, Joseph W.},
abstractNote = {Recently, a local-Ising-type magnetic order was inferred from neutron diffraction of the antiferromagnetic Er2Ge2O7 (pg-ErGO) with an applied magnetic field. Here, we use neutron spectroscopy to investigate the energetics of pg-ErGO and the isostructural Yb2Ge2O7 (pg-YbGO) to evaluate the adequacy of the local-Ising description. To begin, we generate a model of the magnetic structure of pg-YbGO using neutron diffraction and find a net ferromagnetic moment. While pg-ErGO and pg-YbGO have highly symmetric crystal structures (P41212 tetragonal space group 92) with only one trivalent rare-earth magnetic site, the point symmetry of the rare-earth site is low with only a single symmetry element (point group C1). For both compounds, the energy scale of the first excited state is large compared to the magnetic ordering temperature, suggesting Ising character. The ground-state Kramer's doublet of both compounds is dominated by the maximal mJ component. However, the low point group symmetry of the rare-earth site leads to finite mixing of all other mJ's, which suggests potential deviations from Ising behavior. Moreover, quasielastic scattering is observed deep in the ordered state of pg-ErGO and pg-YbGO that may be due to non-Ising behavior. The dominant magnetic interaction in both compounds is found to be magnetostatic by considering the magnetic excitations in the ordered state. Lastly, from consideration of these data, the pg-YbGO is more Ising-like than pg-ErGO. Also, quantum multicritical points are anticipated with applied magnetic field in both compounds.},
doi = {10.1103/PhysRevB.101.014420},
journal = {Physical Review B},
number = 1,
volume = 101,
place = {United States},
year = {2020},
month = {1}
}

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