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Title: Quenched crystal-field disorder and magnetic liquid ground states in Tb 2 Sn 2 - x Ti x O 7 [Crystal field disorder in the quantum spin ice ground state of Tb2Sn2-xTixO7]

Solid-solutions of the "soft" quantum spin ice pyrochlore magnets Tb 2B 2O 7 with B=Ti and Sn display a novel magnetic ground state in the presence of strong B-site disorder, characterized by a low susceptibility and strong spin fluctuations to temperatures below 0.1 K. These materials have been studied using ac-susceptibility and muSR techniques to very low temperatures, and time-of-flight inelastic neutron scattering techniques to 1.5 K. Remarkably, neutron spectroscopy of the Tb 3+ crystal field levels appropriate to at high B-site mixing (0.5 < x < 1.5 in Tb 2Sn 2-xTi xO 7) reveal that the doublet ground and first excited states present as continua in energy, while transitions to singlet excited states at higher energies simply interpolate between those of the end members of the solid solution. The resulting ground state suggests an extreme version of a random-anisotropy magnet, with many local moments and anisotropies, depending on the precise local configuration of the six B sites neighboring each magnetic Tb 3+ ion.
 [1] ;  [2] ;  [3] ;  [3] ;  [2] ;  [1] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [8] ;  [7] ;  [3]
  1. McMaster Univ., Hamilton, ON (Canada)
  2. Univ. Paris Sud XI, Orsay, (France)
  3. Pennsylvania State Univ., University Park, PA (United States)
  4. Univ. Paris Sud XI, Orsay, (France); Institut Universitaire de France, Paris (France)
  5. McMaster Univ., Hamilton, ON (Canada); Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. Princeton Univ., NJ (United States)
  8. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
AC05-00OR22725; DG-FG02-08ER46544
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 24; Journal ID: ISSN 1098-0121
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States