Spin liquid state in the disordered triangular lattice Sc2Ga2CuO7 revealed by NMR

Khuntia, P.; Kumar, R.; Mahajan, A. V.; Baenitz, M.; Furukawa, Y.

doi:10.1103/PhysRevB.93.140408

Title: Spin liquid state in the disordered triangular lattice Sc₂Ga₂CuO₇ revealed by NMR

Journal Article · Mon Apr 18 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.140408· OSTI ID:1259550

Khuntia, P. ^[1]; Kumar, R. ^[2]; Mahajan, A. V. ^[2]; Baenitz, M. ^[3]; Furukawa, Y. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
Indian Institute of Technology Bombay Powai Mumbai (India)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)

We present microscopic magnetic properties of a two-dimensional triangular lattice Sc₂Ga₂CuO₇, consisting of single and double triangular Cu planes. An antiferromagnetic (AFM) exchange interaction J/k_B ≈ 35 K between Cu²⁺ (S = 1/2) spins in the triangular biplane is obtained from the analysis of intrinsic magnetic susceptibility data. The intrinsic magnetic susceptibility, extracted from ⁷¹Ga NMR shift data, displays the presence of AFM short range spin correlations and remains finite down to 50 mK, suggesting a nonsinglet ground state. The nuclear spin-lattice relaxation rate (1/T₁) reveals a slowing down of Cu²⁺ spin fluctuations with decreasing T down to 100 mK. Magnetic specific heat (C_m) and 1/T₁ exhibit power law behavior at low temperatures, implying the gapless nature of the spin excitation spectrum. The absence of long range magnetic ordering down to ~J/700, nonzero spin susceptibility at low T, and the power law behavior of C_m and 1/T₁ suggest a gapless quantum spin liquid (QSL) state. Our results demonstrate that persistent spin dynamics induced by frustration maintain a quantum-disordered state at T → 0 in this triangular lattice antiferromagnet. Furthermore, this suggests that the low energy modes are dominated by spinon excitations in the QSL state due to randomness engendered by disorder and frustration.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1259550

Alternate ID(s):: OSTI ID: 1247906

Report Number(s):: IS-J-9012; PRBMDO

Journal Information:: Physical Review B, Vol. 93, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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