Slow spin-glass and fast spin-liquid components in quasi-two-dimensional La2(Cu,Li)O4

Abstract

In conventional spin glasses, magnetic interaction is not strongly anisotropic and the entire spin system is believed to be frozen below the spin-glass transition temperature. In La2Cu0.94Li0.06O4, for which the in-plane exchange interaction dominates the interplane one, only a fraction of spins with antiferromagnetic correlations extending to neighboring planes become spin-glass. The remaining spins with only in-plane antiferromagnetic correlations remain spin-liquid at low temperature. Such a novel partial spin freezing out of a two-dimensional spin-liquid observed in this cold neutron scattering study is likely due to a delicate balance between disorder and quantum fluctuations in the quasi-two dimensional S=1/2 Heisenberg system.

6 pages, 4 figures

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• Novel dynamic scaling regime in hole-doped La2CuO4
• Commensurate dynamic magnetic correlations in La2(Cu,Li)O4
• In-Plane Conductivity Anisotropy in Underdoped Cuprates in the Spin-Charge Gauge Approach
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Cited by in corpus (9)

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• Correlations and dynamics of spins in an XY-like spin-glass (Ni0.4Mn0.6)TiO3 single crystal system
• Magnetic order in lightly doped cuprates: Coherent vs. incoherent hole quasiparticles and non-magnetic impurities
• Density matrix renormalization on random graphs and the quantum spin-glass transition
• The Fincher-Burke spin excitations and omega/T scaling in the insulating 5% Sr-doped La2CuO4
• The "Bohr" Model for the High Tc Superconductivity
• Separation of magnetic and superconducting behaviour in YBCO6.33 (Tc=8.4 K)
• AC Hopping Magnetotransport Across the Spin Flop Transition in Lightly Doped La_2CuO_4