ACTA

Observation of Anisotropic Exchange in a Spin Ladder by ESR

E. Čižmár^a, M. Ozerov^b, K.W. Krämer^c, Ch. Rüegg^d, S.A. Zvyagin^b
^aInstitute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, Košice, Slovakia
^bDresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
^cDepartment of Chemistry and Biochemistry, University of Bern, Bern, Switzerland
^dLaboratory for Neutron Scattering, Paul Scherrer Institut, Villigen PSI, Switzerland

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We report on high resolution X-band electron spin resonance (ESR) spectroscopy studies of the spin-ladder material (C₅H₁₂N)₂CuBr₄. Our experiments provide a direct evidence for the presence of anisotropy in (C₅H₁₂N)₂CuBr₄ in contrast to a fully isotropic spin-ladder model employed for this system previously. Low-temperature angular dependence of ESR transitions is analyzed employing a simple spin-1/2 dimer model with the symmetric anisotropic exchange interaction.

DOI: 10.12693/APhysPolA.126.238
PACS numbers: 76.30.-v, 74.25.Ha, 75.50.Gg, 75.30.Gw