Frustrated Zig-Zag Spin Chains Formed by Hydrogen Bonds in [Cu(H2O)(OH)(tmen)]2[Pd(CN)4]·2H2O

E. Čižmára, A. Orendáčová a, M. Orendáč a, J. Kuchár b, A. Feher a, J.-H. Park c, and M.W. Meisela,d aInstitute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia bInstitute of Chemistry, Faculty of Sciences, P.J. Šafárik University, Moyzesova 11, 041 54 Košice, Slovakia cNational High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310-3706, USA dDepartment of Physics and National High Magnetic Field Laboratory, University of Florida, Gainesville, FL 32611-8440, USA

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The magnetic properties of the novel dimeric compound [Cu(H2O)(OH)(tmen)]2[Pd(CN)4]·2H2O (tmen=N,N,N',N'-tetramethylethylenediamine) with modulated crystal structure were studied in the temperature range from 95 mK to 300 K. Magnetic measurements revealed a presence of weak antiferromagnetic exchange coupling in the compound. The temperature dependence of specific heat is characterized by the presence of a Schottky-like maximum at 0.47 K and a λ-anomaly at 0.28 K, indicating the formation of long-range order in the system. The comparison of the experimental data with theoretical predictions revealed the presence of antiferromagnetic intradimer exchange coupling J/kB= -1.2 K and interdimer coupling of a similar strength mediated via hydrogen bonds between dimeric units forming a frustrated magnetic zig-zag chain structure.

DOI: 10.12693/APhysPolA.131.940 PACS numbers: 75.30.Et, 76.30.-v, 75.40.-s