ACTA

Neutron and EPR Study of Cu(tn)Cl₂ - a Two-Dimensional Spatially Anisotropic Triangular-Lattice Antiferromagnet

R. Tarasenko^a, A. Orendáčová^a, E. Čižmár^a, S. Maťaš^b, M. Orendáč^a, V. Zeleňák^c, V. Pavlík^d, K. Siemensmeyer^b, S. Zvyagin^e, J. Wosnitza^e, A. Feher^a
^aInstitute of Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia
^bHelmholtz-Zentrum Berlin, Hahn-Meitner Platz 1, D-14109 Berlin, Germany
^cInstitute of Chemistry, Faculty of Science, P.J. Šafárik University, Moyzesova 11, 041 54 Košice, Slovakia
^dInstitute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia
^eDresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf and TU Dresden, D-01314 Dresden, Germany

Full Text PDF

We have studied the temperature dependence of the lattice parameters and the influence of spin anisotropy on the electron paramagnetic spectra of Cu(tn)Cl₂, an S=1/2 quasi-two-dimensional spatially-anisotropic triangular-lattice Heisenberg antiferromagnet. The variation of the resonance fields with temperature reflects the presence of an easy-plane exchange anisotropy with J_z/J_x,y<1 and g-factor anisotropy, g_z/g_x,y>1.

DOI: 10.12693/APhysPolA.126.232
PACS numbers: 75.30.Gw, 75.50.Ee