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Title: Spin liquid state in the 3D frustrated antiferromagnet PbCuTe2O6: NMR and muon spin relaxation studies

In this study, PbCuTe2O6 is a rare example of a spin liquid candidate featuring a three-dimensional magnetic lattice. Strong geometric frustration arises from the dominant antiferromagnetic interaction that generates a hyperkagome network of Cu2+ ions although additional interactions enhance the magnetic lattice connectivity. Through a combination of magnetization measurements and local probe investigations by NMR and muon spin relaxation down to 20 mK, we provide robust evidence for the absence of magnetic freezing in the ground state. The local spin susceptibility probed by the NMR shift hardly deviates from the macroscopic one down to 1 K pointing to a homogeneous magnetic system with a low defect concentration. The saturation of the NMR shift and the sublinear power law temperature (T) evolution of the 1/T1 NMR relaxation rate at low T point to a nonsinglet ground state favoring a gapless fermionic description of the magnetic excitations. Below 1 K a pronounced slowing down of the spin dynamics is witnessed, which may signal a reconstruction of spinon Fermi surface. Nonetheless, the compound remains in a fluctuating spin liquid state down to the lowest temperature of the present investigation.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [7] ;  [8]
  1. Ames Lab., Ames, IA (United States); CNRS, Univ. Paris-Sud, Univ. Paris-Saclay, Orsay Cedex (France)
  2. CNRS, Univ. Paris-Sud, Univ. Paris-Saclay, Orsay Cedex (France)
  3. Univ. of Hyderabad, Central Univ., Hyderabad (India); National Taiwan Univ., Taipei (Taiwan)
  4. Indian Institute of Technology Bombay Powai Mumbai (India)
  5. Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  6. National Taiwan Univ., Taipei (Taiwan)
  7. Paul Scherrer Institute, Villigen PSI (Switzerland)
  8. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
OSTI Identifier:
1253757
Report Number(s):
IS-J--8945
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
PIIF-GA-2013-627322; AC02-07CH11358; ANR-12-BS04- 0021
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 10; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY