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Title: XY antiferromagnetic ground state in the effective S = 1 2 pyrochlore Yb 2 Ge 2 O 7

Abstract

We report neutron scattering and muon spin relaxation measurements (μSR) on the pyrochlore antiferromagnet Yb2Ge2O7. Inelastic neutron scattering was used to probe the transitions between crystal electric field levels, allowing us to determine the eigenvalues and eigenvectors appropriate to the J=$$\frac{7}{2}$$ Yb3+ ion in this environment. The crystal electric field ground state doublet in Yb2Ge2O7 corresponds primarily to mJ=± $$\frac{1}{2}$$ with local XY anisotropy, consistent with an Seff = 12 description for the Yb moments. $μ$SR measurements reveal the presence of an ordering transition at TN=0.57 K with persistent weak dynamics in the ordered state. Finally, we present neutron diffraction measurements that reveal a clear phase transition to the $k$=(000)$$Γ_5$$ ground state with an ordered magnetic moment of 0.3(1)$$μ_B$$ per Yb ion. We compare and contrast this phenomenology with the low-temperature behavior of Yb2Ti2O7 and Er2Ti2O7, the prototypical Seff= $$\frac{1}{2}$$ XY pyrochlore magnets.

Authors:
 [1];  [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [2];  [3];  [4];  [4];  [5];  [6];  [7];  [7]
  1. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  3. Univ. de São Paulo, São Paulo (Brazil). Inst. de Física
  4. Univ. of Edinburgh, Edinburgh (United Kingdom)
  5. National Inst. for Materials Science (NIMS), Tsukuba (Japan)
  6. Univ. of Winnipeg, Winnipeg, Manitoba (Canada). Dept. of Chemistry
  7. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy; Canadian Inst. for Advanced Research, Toronto, ON (Canada)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1528742
Alternate Identifier(s):
OSTI ID: 1240478
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 10; 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

Hallas, Alannah M., Gaudet, J., Wilson, Murray N., Munsie, Timothy J., Aczel, Adam A., Stone, Matthew B., Freitas, R. S., Arevalo-Lopez, A. M., Attfield, J. P., Tachibana, Makoto, Wiebe, Christopher, Luke, Graeme M., and Gaulin, Bruce D. XY antiferromagnetic ground state in the effective S=12 pyrochlore Yb2Ge2O7. United States: N. p., 2016. Web. https://doi.org/10.1103/PhysRevB.93.104405.
Hallas, Alannah M., Gaudet, J., Wilson, Murray N., Munsie, Timothy J., Aczel, Adam A., Stone, Matthew B., Freitas, R. S., Arevalo-Lopez, A. M., Attfield, J. P., Tachibana, Makoto, Wiebe, Christopher, Luke, Graeme M., & Gaulin, Bruce D. XY antiferromagnetic ground state in the effective S=12 pyrochlore Yb2Ge2O7. United States. https://doi.org/10.1103/PhysRevB.93.104405
Hallas, Alannah M., Gaudet, J., Wilson, Murray N., Munsie, Timothy J., Aczel, Adam A., Stone, Matthew B., Freitas, R. S., Arevalo-Lopez, A. M., Attfield, J. P., Tachibana, Makoto, Wiebe, Christopher, Luke, Graeme M., and Gaulin, Bruce D. Tue . "XY antiferromagnetic ground state in the effective S=12 pyrochlore Yb2Ge2O7". United States. https://doi.org/10.1103/PhysRevB.93.104405. https://www.osti.gov/servlets/purl/1528742.
@article{osti_1528742,
title = {XY antiferromagnetic ground state in the effective S=12 pyrochlore Yb2Ge2O7},
author = {Hallas, Alannah M. and Gaudet, J. and Wilson, Murray N. and Munsie, Timothy J. and Aczel, Adam A. and Stone, Matthew B. and Freitas, R. S. and Arevalo-Lopez, A. M. and Attfield, J. P. and Tachibana, Makoto and Wiebe, Christopher and Luke, Graeme M. and Gaulin, Bruce D.},
abstractNote = {We report neutron scattering and muon spin relaxation measurements (μSR) on the pyrochlore antiferromagnet Yb2Ge2O7. Inelastic neutron scattering was used to probe the transitions between crystal electric field levels, allowing us to determine the eigenvalues and eigenvectors appropriate to the J=$\frac{7}{2}$ Yb3+ ion in this environment. The crystal electric field ground state doublet in Yb2Ge2O7 corresponds primarily to mJ=± $\frac{1}{2}$ with local XY anisotropy, consistent with an Seff = 12 description for the Yb moments. $μ$SR measurements reveal the presence of an ordering transition at TN=0.57 K with persistent weak dynamics in the ordered state. Finally, we present neutron diffraction measurements that reveal a clear phase transition to the $k$=(000)$Γ_5$ ground state with an ordered magnetic moment of 0.3(1)$μ_B$ per Yb ion. We compare and contrast this phenomenology with the low-temperature behavior of Yb2Ti2O7 and Er2Ti2O7, the prototypical Seff= $\frac{1}{2}$ XY pyrochlore magnets.},
doi = {10.1103/PhysRevB.93.104405},
journal = {Physical Review B},
number = 10,
volume = 93,
place = {United States},
year = {2016},
month = {3}
}

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Figures / Tables:

FIG. 1. FIG. 1.: (a) Inelastic neutron scattering spectrum of Yb2Ge2O7 measured at 2 K with a neutron beam of incident energy 150 meV. A background spectrum, measured on an empty can, has been subtracted from the data. Crystal eld excitations at 80.7 meV, 84.2 meV, and 123.3 meV are indicated bymore » the blue, yellow, and green arrows, respectively. (b) An integrated cut of the same data over the range Q = [5.4, 6.0] Å-1. The fit to the data is achieved using a Hamiltonian, given by Eqn. 1, which approximates the Coulomb potential generated by the crystal electric fi eld due to the neighboring oxygen atoms.« less

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.