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Title: Effect of chemical pressure on the crystal electric field states of erbium pyrochlore magnets

Abstract

We have carried out a systematic study of the crystal electric field excitations in the family of cubic pyrochlores Er 2B 2O 7 with B=Ge, Ti, Pt, and Sn, using neutron spectroscopy. All members of this family are magnetic insulators based on 4f 11Er 3+ and nonmagnetic B 4+. At sufficiently low temperatures, long-range antiferromagnetic order is observed in each of these Er 2B 2O 7 pyrochlores. The different ionic sizes associated with different nonmagnetic B 4+ cations correspond to positive or negative chemical pressure, depending on the relative contraction or expansion of the crystal lattice, which gives rise to different local environments at the Er 3+ site. Our results show that the g-tensor components are XY-like for all four members of the Er 2B 2O 7 series. However, the XY anisotropy is much stronger for Er 2Pt 2O 7 and Er 2Sn 2O 7(g⊥/gz>25) than for Er 2Ge 2O 7 and Er 2Ti 2O 7(g⊥/gz<4). The variation in the nature of the XY anisotropy in these systems correlates strongly with their ground states as Er 2Ge 2O 7 and Er 2Ti 2O 7 order into Γ 5 magnetic structures, whereas Er 2Pt 2O 7 and Er 2Sn 2O 7more » order in the Γ 7 Palmer-Chalker structure.« less

Authors:
 [1];  [1]; ORCiD logo [2];  [3]
  1. McMaster Univ., Hamilton, ON (Canada)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. McMaster Univ., Hamilton, ON (Canada); Brockhouse Inst. for Materials Research, Hamilton, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (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) (SC-22)
OSTI Identifier:
1432150
Alternate Identifier(s):
OSTI ID: 1417229
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 2; 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

Gaudet, J, Hallas, A. A., Kolesnikov, Alexander I., and Gaulin, Bruce D. Effect of chemical pressure on the crystal electric field states of erbium pyrochlore magnets. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.024415.
Gaudet, J, Hallas, A. A., Kolesnikov, Alexander I., & Gaulin, Bruce D. Effect of chemical pressure on the crystal electric field states of erbium pyrochlore magnets. United States. doi:10.1103/PhysRevB.97.024415.
Gaudet, J, Hallas, A. A., Kolesnikov, Alexander I., and Gaulin, Bruce D. Wed . "Effect of chemical pressure on the crystal electric field states of erbium pyrochlore magnets". United States. doi:10.1103/PhysRevB.97.024415. https://www.osti.gov/servlets/purl/1432150.
@article{osti_1432150,
title = {Effect of chemical pressure on the crystal electric field states of erbium pyrochlore magnets},
author = {Gaudet, J and Hallas, A. A. and Kolesnikov, Alexander I. and Gaulin, Bruce D.},
abstractNote = {We have carried out a systematic study of the crystal electric field excitations in the family of cubic pyrochlores Er2B2O7 with B=Ge, Ti, Pt, and Sn, using neutron spectroscopy. All members of this family are magnetic insulators based on 4f11Er3+ and nonmagnetic B4+. At sufficiently low temperatures, long-range antiferromagnetic order is observed in each of these Er2B2O7 pyrochlores. The different ionic sizes associated with different nonmagnetic B4+ cations correspond to positive or negative chemical pressure, depending on the relative contraction or expansion of the crystal lattice, which gives rise to different local environments at the Er3+ site. Our results show that the g-tensor components are XY-like for all four members of the Er2B2O7 series. However, the XY anisotropy is much stronger for Er2Pt2O7 and Er2Sn2O7(g⊥/gz>25) than for Er2Ge2O7 and Er2Ti2O7(g⊥/gz<4). The variation in the nature of the XY anisotropy in these systems correlates strongly with their ground states as Er2Ge2O7 and Er2Ti2O7 order into Γ5 magnetic structures, whereas Er2Pt2O7 and Er2Sn2O7 order in the Γ7 Palmer-Chalker structure.},
doi = {10.1103/PhysRevB.97.024415},
journal = {Physical Review B},
number = 2,
volume = 97,
place = {United States},
year = {2018},
month = {1}
}

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Cited by: 7 works
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Figures / Tables:

FIG. 1 FIG. 1: Rietveld refinements of the time-of-flight neutron powder diffraction patterns for each of the erbium pyrochlore magnets, Er2B2O7, B = (a) Ge (b) Ti (c) Pt and (d) Sn. The data sets were collected at 10 K using Bank 2 of the POWGEN diffractometer (λcenter = 1.066 Å). Themore » data were refined against the Fd$\bar{3}$m space group, and the goodness-of-fit parameters for each sample are given in Table I. The insets show an expanded view of a high Q region, from 12 to 16 Å−1.« less

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    • DOI: 10.1016/j.nima.2014.07.029

    Order as an effect of disorder
    journal, January 1980


    Crystal-field interaction in the pyrochlore magnet Ho2Ti2O7
    journal, May 2000

    • Rosenkranz, S.; Ramirez, A. P.; Hayashi, A.
    • Journal of Applied Physics, Vol. 87, Issue 9
    • DOI: 10.1063/1.372565

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