Susceptibility measurements on a weakly coupled spin-dimersystem consisting of 
nitronyl-nitroxid stable biradicals

Postulka, L; Wolf, B; Tutsch, U; Cong, PT; Baumgarten, M; Borozdina, Y; Strassel, D; Eggert, S; Lang, M

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Susceptibility measurements on a weakly coupled spin-dimersystem consisting of nitronyl-nitroxid stable biradicals

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https://www.dpg-verhandlungen.de/year/2014/conference/dresden/static/tt.pdf
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Postulka, L., Wolf, B., Tutsch, U., Cong, P., Baumgarten, M., Borozdina, Y., et al. (2014). Susceptibility measurements on a weakly coupled spin-dimersystem consisting of nitronyl-nitroxid stable biradicals. In DPG-Frühjahrstagung: Low Temperature Physics Division: Fachverband Tiefe Temperature (TT) (pp. 36-37).

Cite as: https://hdl.handle.net/21.11116/0000-0008-69B5-6

Abstract

We present low-temperature susceptibility data on a spinS=12dimersystem consisting of nitronyl-nitroxid radicals which are bridged viatolan molecules. The material, exhibiting a double-layer structure,can be regarded as a quasi- 2D system. From SQUID magnetisationmeasurements on high-quality single crystals, an intra-dimer couplingconstant ofJintra/kB≈9.6 K can be determined. In addition, thedata reveal indications for an inter-dimer coupling of the order of 1 K.In order to look for magnetic field-induced ordering phenomena, AC-susceptibility measurements were performed down to temperatures aslow asT= 34 mK and magnetic fields up toB= 10.5 T. For temperatures belowT= 250 mK, a double-peak structure was observedat fields between 8 T and 9.5 T consistent with the expectation basedon the above-mentioned coupling constants. Furthermore, in the sametemperature range another anomaly aroundB= 4.5 T appears. Fora detailed understanding especially with regard to the dimensionalityof the interactions and the implications for the type of order that isrealized here, Quantum Monte Carlo simulations are underway.