Spin glassiness and power law scaling in a quasi-triangular spin-1/2 compound
| Autor: | Wu, Jian, Wildeboer, Julia S., Werner, Fletcher, Seidel, Alexander, Nussinov, Z., Solin, S. A. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Europhys. Lett. 93, 67001, (2011) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1209/0295-5075/93/67001 |
| Popis: | 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. Comment: 4 pages, 5 figures, RevTeX4 |
| Databáze: | arXiv |
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