Spin glassiness and power law scaling in a quasi-triangular spin-1/2 compound

Abstract

We present data on the magnetic properties of two classes of layered spin S=1/2 antiferromagnetic quasi-triangular lattice materials: $C{u}_{2(1-x)}Z{n}_{2x}(OH{)}_{3}N{O}_3$ ($0<x<0.65$) and its long chain organic derivatives $C{u}_{2(1-x)}Z{n}_{2x}(OH{)}_3(C_7{H}_{15}COO)\cdot m{H}_{2}O$ ($0<x<0.29$), where non-magnetic Zn substitutes Cu isostructurally. It is found that the long-chain compounds, even in a clean system in the absence of dilution, $x=0$, show spin-glass behavior, as evidenced by DC and AC susceptibility, and by time dependent magnetization measurements. A striking feature is the observation of a sharp crossover between two successive power law regimes in the DC susceptibility above the freezing temperature. Specific heat data are consistent with a conventional phase transition in the unintercalated compounds, and glassy behavior in the long chain compunds.

4 pages, 5 figures, RevTeX4

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Cited by in corpus (4)

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• Emergent quasicrystals in strongly correlated systems
• Quantum critical spin-liquid-like behavior in S = 1/2 quasikagome lattice CeRh1-xPdxSn investigated using muon spin relaxation and neutron scattering
• Magnetic Phase Diagram of Rouaite, Cu${}_2$(OH)${}_3$NO${}_3$