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

Khuntia, P.; Bert, F.; Mendels, P.; Koteswararao, B.; Mahajan, A. V.; Baenitz, M.; Chou, F. C.; Baines, C.; Amato, A.; Furukawa, Y.

doi:10.1103/PhysRevLett.116.107203

Spin liquid state in the 3D frustrated antiferromagnet ${PbCuTe}_{2} O_{6}$ : NMR and muon spin relaxation studies

Journal Article · Fri Mar 11 00:00:00 EST 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.116.107203· OSTI ID:1253757

Khuntia, P. ^[1]; Bert, F. ^[2]; Mendels, P. ^[2]; Koteswararao, B. ^[3]; Mahajan, A. V. ^[4]; Baenitz, M. ^[5]; Chou, F. C. ^[6]; Baines, C. ^[7]; Amato, A. ^[7]; Furukawa, Y. ^[8]

Ames Lab., Ames, IA (United States); CNRS, Univ. Paris-Sud, Univ. Paris-Saclay, Orsay Cedex (France)
CNRS, Univ. Paris-Sud, Univ. Paris-Saclay, Orsay Cedex (France)
Univ. of Hyderabad, Central Univ., Hyderabad (India); National Taiwan Univ., Taipei (Taiwan)
Indian Institute of Technology Bombay Powai Mumbai (India)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
National Taiwan Univ., Taipei (Taiwan)
Paul Scherrer Institute, Villigen PSI (Switzerland)
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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1253757

Alternate ID(s):: OSTI ID: 1241436

Report Number(s):: IS-J--8945

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 116; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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