Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division; McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy
McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
McMaster Univ., Hamilton, ON (Canada). Brockhouse Inst. for Materials Research
McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy and Brockhouse Inst. for Materials Research; Canadian Inst. for Advanced Research (CIFAR), Toronto (Canada)
The pyrochlore magnet Yb2Ti2O7 has been proposed as a quantum spin ice candidate, a spin liquid state expected to display emergent quantum electrodynamics with gauge photons among its elementary excitations. However, Yb2Ti2O7's ground state is known to be very sensitive to its precise stoichiometry. Powder samples, produced by solid-state synthesis at relatively low temperatures, tend to be stoichiometric, while single crystals grown from the melt tend to display weak “stuffing” wherein ~2% of the Yb3+, normally at the A site of the A2B2O7 pyrochlore structure, reside as well at the B site. In these samples Yb3+ ions should exist in defective environments at low levels and be subjected to crystalline electric fields very different from those at the stoichiometric A sites. Neutron scattering measurements of Yb3+ in four compositions of Yb2+xTi2-xO7-y show the spectroscopic signatures for these defective Yb3+ ions and explicitly demonstrate that the spin anisotropy of the Yb3+ moment changes from XY-like for stoichiometric Yb3+ to Ising-like for “stuffed” B site Yb3+ or for A site Yb3+ in the presence of oxygen vacancies.
Sala, Gabriele, et al. "Crystal field excitations from <math><msup><mrow><mi>Yb</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math> ions at defective sites in highly stuffed <math><mrow><msub><mi>Yb</mi><mn>2</mn></msub><msub><mi>Ti</mi><mn>2</mn></msub><msub><mi mathvariant='normal'>O</mi><mn>7</mn></msub></mrow></math>." Physical Review B, vol. 97, no. 22, Jun. 2018. https://doi.org/10.1103/PhysRevB.97.224409
Sala, Gabriele, Maharaj, Dalini D., Stone, Matthew B., Dabkowska, H. A., & Gaulin, Bruce D. (2018). Crystal field excitations from <math><msup><mrow><mi>Yb</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math> ions at defective sites in highly stuffed <math><mrow><msub><mi>Yb</mi><mn>2</mn></msub><msub><mi>Ti</mi><mn>2</mn></msub><msub><mi mathvariant='normal'>O</mi><mn>7</mn></msub></mrow></math>. Physical Review B, 97(22). https://doi.org/10.1103/PhysRevB.97.224409
Sala, Gabriele, Maharaj, Dalini D., Stone, Matthew B., et al., "Crystal field excitations from <math><msup><mrow><mi>Yb</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math> ions at defective sites in highly stuffed <math><mrow><msub><mi>Yb</mi><mn>2</mn></msub><msub><mi>Ti</mi><mn>2</mn></msub><msub><mi mathvariant='normal'>O</mi><mn>7</mn></msub></mrow></math>," Physical Review B 97, no. 22 (2018), https://doi.org/10.1103/PhysRevB.97.224409
@article{osti_1474482,
author = {Sala, Gabriele and Maharaj, Dalini D. and Stone, Matthew B. and Dabkowska, H. A. and Gaulin, Bruce D.},
title = {Crystal field excitations from <math><msup><mrow><mi>Yb</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math> ions at defective sites in highly stuffed <math><mrow><msub><mi>Yb</mi><mn>2</mn></msub><msub><mi>Ti</mi><mn>2</mn></msub><msub><mi mathvariant='normal'>O</mi><mn>7</mn></msub></mrow></math>},
annote = {The pyrochlore magnet Yb2Ti2O7 has been proposed as a quantum spin ice candidate, a spin liquid state expected to display emergent quantum electrodynamics with gauge photons among its elementary excitations. However, Yb2Ti2O7's ground state is known to be very sensitive to its precise stoichiometry. Powder samples, produced by solid-state synthesis at relatively low temperatures, tend to be stoichiometric, while single crystals grown from the melt tend to display weak “stuffing” wherein ~2% of the Yb3+, normally at the A site of the A2B2O7 pyrochlore structure, reside as well at the B site. In these samples Yb3+ ions should exist in defective environments at low levels and be subjected to crystalline electric fields very different from those at the stoichiometric A sites. Neutron scattering measurements of Yb3+ in four compositions of Yb2+xTi2-xO7-y show the spectroscopic signatures for these defective Yb3+ ions and explicitly demonstrate that the spin anisotropy of the Yb3+ moment changes from XY-like for stoichiometric Yb3+ to Ising-like for “stuffed” B site Yb3+ or for A site Yb3+ in the presence of oxygen vacancies.},
doi = {10.1103/PhysRevB.97.224409},
url = {https://www.osti.gov/biblio/1474482},
journal = {Physical Review B},
issn = {ISSN PRBMDO},
number = {22},
volume = {97},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2018},
month = {06}}
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 764https://doi.org/10.1016/j.nima.2014.07.029