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Title: Spin liquid state in the 3D frustrated antiferromagnet PbCuTe 2 O 6 : NMR and muon spin relaxation studies

Journal Article · · Physical Review Letters
 [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)

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.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
PIIF-GA-2013-627322; AC02-07CH11358; ANR-12-BS04- 0021
OSTI ID:
1253757
Alternate ID(s):
OSTI ID: 1241436
Report Number(s):
IS-J-8945; PRLTAO
Journal Information:
Physical Review Letters, Vol. 116, Issue 10; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

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Phase Formation Studies of Lead(II) Copper(II) Oxotellurates: The Crystal Structures of Dimorphic PbCuTeO 5 , PbCuTe 2 O 6 , and [Pb 2 Cu 2 (Te 4 O 11 )](NO 3 ) 2 : Phase Formation Studies of Lead(II) Copper(II) Oxotellurates: The Crystal Structures of Dimorphic PbCuTeO journal August 2018
A spin–orbital-entangled quantum liquid on a honeycomb lattice journal February 2018
Quantum magnetism in minerals journal July 2018
Electrodynamics of quantum spin liquids journal April 2018
Quantum Spin Liquid States text January 2016
Electrodynamics of quantum spin liquids text January 2018
Quantum Magnetism in Minerals text January 2018