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arXiv · 1312.3031

Muon spin spectroscopy in multiferroic (Cu,Zn)$_{3}$Mo$_{2}$O$_{9}$

H. Kuroe·K. Aoki·T. Sato·R. Kino·H. Kuwahara·T. Sekine·M. Hase·I. Kawasaki·T. Kawamata·T. Suzuki·I. Watanabe·K. Oka·T. Ito·H. Eisaki
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Abstract

We present the muon spin relaxation/rotation spectra in the multiferroic compound (Cu,Zn)$_{3}$Mo$_{2}$O$_{9}$. The parent material Cu$_{3}$Mo$_{2}$O$_{9}$ has a multiferroic phase below $T_{\rm N}$ = 8.0 K, where the canted antiferromagnetism and the ferroelectricity coexist. The asymmetry time spectra taken at RIKEN-RAL pulsed muon facility show a drastic change at $T_{\rm N}$. At low temperatures the weakly beating oscillation caused by the static internal magnetic fields in the antiferromagnetic phase was observed in Cu$_{3}$Mo$_{2}$O$_{9}$ and the lightly ($0.5\%$) Zn-doped sample. From the fitting of the oscillating term, we obtain the order parameter in these samples: ferromagnetic moment in two sublattices of antiferromagnet. In the heavily ($5.0\%$) Zn-doped sample, the muon-spin oscillation is rapidly damped. The frequency-domain spectrum of this sample suggests a formation of magnetic superstructure.

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H. Kuroe, K. Aoki, T. Sato, R. Kino, H. Kuwahara, T. Sekine, M. Hase, I. Kawasaki, T. Kawamata, T. Suzuki, I. Watanabe, K. Oka, T. Ito, H. Eisaki. 2013-12-11. Muon spin spectroscopy in multiferroic (Cu,Zn)$_{3}$Mo$_{2}$O$_{9}$. https://doi.org/10.7566/jpscp.2.010206

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