Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 45: Correlated Electrons: Poster Session
TT 45.69: Poster
Thursday, March 29, 2012, 15:00–19:00, Poster B
ESR studies of the quasi-2D antiferromagnet Cu(Pz)2(ClO4)2 — •M. Ozerov1, J. Wosnitza1, E. Čižmár2, F. Xiao3, M.M. Turnbull3, C. P. Landee4, and S.A. Zvyagin1 — 1Dresden High Magnetic Field Laboratory (HLD),Helmholtz-Zentrum Dresden-Rossendorf (HZDR), 01328 Dresden, Germany — 2Centre of Low Temperature Physics, P.J. Šafárik University, SK-041 54 Košice, Slovakia — 3Carlson School of Chemistry and Biochemistry, Clark University, Worcester, Massachusetts 01610, USA — 4Department of Physics, Clark University, Worcester, Massachusetts 01610, USA
We report systematic high-field electron spin resonance (ESR) studies of the quasi-two-dimensional spin-1/2 Heisenberg antiferromagnet Cu(pz)2(ClO4)2 (pz denotes pyrazine or C4H4N2). The linewidth and resonance-field temperature dependences of the ESR absorptions in this compound were investigated in the frequency range from 85 to 416 GHz in magnetic fields up to 16 T. A pronounced ESR linewidth anomaly was revealed in the vicinity of TN. This anomaly reflects enhanced critical fluctuations in this compound at the 3D ordering. The experiment revealed a significant change in the linewidth behavior for magnetic fields above 7 T, whose origin will be discussed.
The work was supported in part by DFG and EuroMagNET II (EU Contract No. 228043).