The Rare-earth Based Single-ion Magnet CsNd(MoO4)2

V. Tkáča, K. Tibenskáb, A. Orendáčováa, M. Orendáča, A. G. Andersc, V. Pavlíkd, A. Fehera aInstitute of Physics, Faculty of Sciences, P. J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia bFaculty of Aeronautics, Technical University, Rampová 7, 041 21 Košice, Slovakia cInstitute of Low Temperature Physics and Engineering, Lenin Av. 47, 3 101 64 Kharkov, Ukraine dInstitute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia

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Specific heat, magnetization and DC susceptibility of the single crystal CsNd(MoO4)2,a layered rare-earth dimolybdate, have been investigated nominally, in the temperature range from 100 mK to 300 K in the magnetic field up to 5 T, applied along the a axis. The analysis of the experimental data revealed the absence of a phase transition to the magnetic ordered state down to 100 mK. The application of a standard two-level model yielded an excellent agreement with the specific heat data above 2 K in nonzero magnetic field indicating a weakness of magnetic correlations and a predominant occupation of the ground-energy doublet. The latter indicates a large energy separation between the ground and first excited doublet. These measurements suggest that CsNd(MoO4)2 can represent a good realization of a single-ion magnet.

DOI: 10.12693/APhysPolA.126.244 PACS numbers: 75.40.-s, 75.60.-d