Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-09-26
Physical Review B, 84, 184436 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 7 figures, 2 tables, published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.84.184436
We present an electron spin resonance (ESR) study of single-crystalline spin chain-system CuSe$_2$O$_5$ in the frequency range between 9 GHz and 450 GHz. In a wide temperature range above the N\'{e}el temperature $T_N=17$ K we observe strong and anisotropic frequency dependence of a resonance linewidth. Although sizeable interchain interaction $J_{IC}\approx 0.1 J$ ($J$ is the intrachain interaction) is present in this system, the ESR results agree well with the Oshikawa-Affleck theory for one-dimensional $S=1/2$ Heisenberg antiferromagnet. This theory is used to extract the anisotropies present in CuSe$_2$O$_5$. We find that the symmetric anisotropic exchange $J_c=(0.04 \pm 0.01) \:J$ and the antisymmetric Dzyaloshinskii-Moriya (DM) interaction $D=(0.05\pm 0.01)\:J$ are very similar in size in this system. Staggered-field susceptibility induced by the presence of the DM interaction is witnessed in the macroscopic susceptibility anisotropy.
Arčon Denis
Berger Heinz
Herak Marijan
Klanjsek Martin
Ozarowski Andrew
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