Gapless quantum excitations from an icelike splayed ferromagnetic ground state in stoichiometric
Abstract
We know the ground state of the quantum spin ice candidate magnet Yb2Ti2O7 to be sensitive to weak disorder at the similar to 1% level which occurs in single crystals grown from the melt. Powders produced by solid state synthesis tend to be stoichiometric and display large and sharp heat capacity anomalies at relatively high temperatures, T-C similar to 0.26 K. We have carried out neutron elastic and inelastic measurements on well characterized and equilibrated stoichiometric powder samples of Yb2Ti2O7 which show resolution-limited Bragg peaks to appear at low temperatures, but whose onset correlates with temperatures much higher than T-C. The corresponding magnetic structure is best described as an icelike splayed ferromagnet. In the spin dynamics of Yb2Ti2O7 we see the gapless on an energy scale <0.09 meV at all temperatures and organized into a continuum of scattering with vestiges of highly overdamped ferromagnetic spin waves present. These excitations differ greatly from conventional spin waves predicted for Yb2Ti2O7's mean field ordered state, but appear robust to weak disorder as they are largely consistent with those displayed by nonstoichiometric crushed single crystals and single crystals, as well as by powder samples of Yb2Ti2O7's sister quantum magnet Yb2Ti2O7.
- Authors:
-
- McMaster Univ., Hamilton, ON (Canada)
- Johns Hopkins Univ., Baltimore, MD (United States); National Inst. of Standards and Technology, Gaithersburg, MD (United States)
- National Inst. of Standards and Technology, Gaithersburg, MD (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Brockhouse Inst. for Materials Research, Hamilton, ON (Canada)
- McMaster Univ., Hamilton, ON (Canada); Brockhouse Inst. for Materials Research, Hamilton, ON (Canada); Canadian Inst. for Materials Research, Toronto, ON (Canada)
- 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:
- 1261510
- Alternate Identifier(s):
- OSTI ID: 1236898
- Grant/Contract Number:
- AC05-00OR22725; DMR-094472
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 93; Journal Issue: 6; 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., Ross, K. A., Kermarrec, E., Butch, N. P., Ehlers, G., Dabkowska, H. A., and Gaulin, B. D. Gapless quantum excitations from an icelike splayed ferromagnetic ground state in stoichiometric Yb2Ti2O7. United States: N. p., 2016.
Web. doi:10.1103/PhysRevB.93.064406.
Gaudet, J., Ross, K. A., Kermarrec, E., Butch, N. P., Ehlers, G., Dabkowska, H. A., & Gaulin, B. D. Gapless quantum excitations from an icelike splayed ferromagnetic ground state in stoichiometric Yb2Ti2O7. United States. https://doi.org/10.1103/PhysRevB.93.064406
Gaudet, J., Ross, K. A., Kermarrec, E., Butch, N. P., Ehlers, G., Dabkowska, H. A., and Gaulin, B. D. Wed .
"Gapless quantum excitations from an icelike splayed ferromagnetic ground state in stoichiometric Yb2Ti2O7". United States. https://doi.org/10.1103/PhysRevB.93.064406. https://www.osti.gov/servlets/purl/1261510.
@article{osti_1261510,
title = {Gapless quantum excitations from an icelike splayed ferromagnetic ground state in stoichiometric Yb2Ti2O7},
author = {Gaudet, J. and Ross, K. A. and Kermarrec, E. and Butch, N. P. and Ehlers, G. and Dabkowska, H. A. and Gaulin, B. D.},
abstractNote = {We know the ground state of the quantum spin ice candidate magnet Yb2Ti2O7 to be sensitive to weak disorder at the similar to 1% level which occurs in single crystals grown from the melt. Powders produced by solid state synthesis tend to be stoichiometric and display large and sharp heat capacity anomalies at relatively high temperatures, T-C similar to 0.26 K. We have carried out neutron elastic and inelastic measurements on well characterized and equilibrated stoichiometric powder samples of Yb2Ti2O7 which show resolution-limited Bragg peaks to appear at low temperatures, but whose onset correlates with temperatures much higher than T-C. The corresponding magnetic structure is best described as an icelike splayed ferromagnet. In the spin dynamics of Yb2Ti2O7 we see the gapless on an energy scale <0.09 meV at all temperatures and organized into a continuum of scattering with vestiges of highly overdamped ferromagnetic spin waves present. These excitations differ greatly from conventional spin waves predicted for Yb2Ti2O7's mean field ordered state, but appear robust to weak disorder as they are largely consistent with those displayed by nonstoichiometric crushed single crystals and single crystals, as well as by powder samples of Yb2Ti2O7's sister quantum magnet Yb2Ti2O7.},
doi = {10.1103/PhysRevB.93.064406},
journal = {Physical Review B},
number = 6,
volume = 93,
place = {United States},
year = {Wed Feb 03 00:00:00 EST 2016},
month = {Wed Feb 03 00:00:00 EST 2016}
}
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