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

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

2010-07-02

arxiv.org/abs/1007.0442v1

Europhys. Lett. 93, 67001, (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, RevTeX4

Scientific paper

10.1209/0295-5075/93/67001

We present data on the magnetic properties of two classes of layered spin S=1/2 antiferromagnetic quasi-triangular lattice materials: $Cu_{2(1-x)}Zn_{2x}(OH)_3NO_3$ ($0 < x < 0.65$) and its long chain organic derivatives $Cu_{2(1-x)}Zn_{2x}(OH)_3(C_7H_{15}COO)\cdot mH_2O$ ($0 < x < 0.29$), 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.

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