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Title: Gapless quantum excitations from an icelike splayed ferromagnetic ground state in stoichiometric Yb 2 Ti 2 O 7

Journal Article · · Physical Review B
 [1];  [2];  [1];  [3];  [4];  [5];  [6]
  1. McMaster Univ., Hamilton, ON (Canada)
  2. Johns Hopkins Univ., Baltimore, MD (United States); National Inst. of Standards and Technology, Gaithersburg, MD (United States)
  3. National Inst. of Standards and Technology, Gaithersburg, MD (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Brockhouse Inst. for Materials Research, Hamilton, ON (Canada)
  6. McMaster Univ., Hamilton, ON (Canada); Brockhouse Inst. for Materials Research, Hamilton, ON (Canada); Canadian Inst. for Materials Research, Toronto, ON (Canada)

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.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; DMR-094472
OSTI ID:
1261510
Alternate ID(s):
OSTI ID: 1236898
Journal Information:
Physical Review B, Vol. 93, Issue 6; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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Cited By (8)

Competing orders in pyrochlore magnets from a Z 2 spin liquid perspective journal August 2019
Ground state selection under pressure in the quantum pyrochlore magnet Yb2Ti2O7 journal March 2017
Crystalline Electric-Field Randomness in the Triangular Lattice Spin-Liquid YbMgGaO 4 journal March 2017
A novel type of splayed ferromagnetic order observed in Yb 2 Ti 2 O 7 journal August 2016
Role of defects in determining the magnetic ground state of ytterbium titanate journal February 2019
Multipole expansion for magnetic structures: A generation scheme for a symmetry-adapted orthonormal basis set in the crystallographic point group journal May 2019
Role of defects in determining the magnetic ground state of ytterbium titanate. text January 2019
A novel type of splayed ferromagnetic order observed in Yb2Ti2O7 text January 2016

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