Electron spin resonance of Ni-doped CuGeO3 in the paramagnetic, spin-Peierls, 
and antiferromagnetic states: Comparison with nonmagnetic impurities

Grenier, B.; Monod, P.; Hagiwara, M.; Matsuda, A.; Katsumata, K.; Clement, S.; Renard, J. P.; Barra, A. L.; Dhalenne, G.; Revcolevschi, A.

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Electron spin resonance of Ni-doped CuGeO₃ in the paramagnetic, spin-Peierls, and antiferromagnetic states: Comparison with nonmagnetic impurities

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Barra, A. L.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Grenier, B., Monod, P., Hagiwara, M., Matsuda, A., Katsumata, K., Clement, S., et al. (2002). Electron spin resonance of Ni-doped CuGeO₃ in the paramagnetic, spin-Peierls, and antiferromagnetic states: Comparison with nonmagnetic impurities. Physical Review B, 65(9): 094425.

Cite as: https://hdl.handle.net/21.11116/0000-000E-F28B-4

Abstract

We have performed electron-spin-resonance measurements on
single crystals of the doped spin-Peierls compounds CuGe1-
ySiyO3 and Cu1-xMxGeO3 with M=Zn, Mg, Ni (x,yless than or equal
to0.1). The first part of our experiments was performed in the
paramagnetic and spin-Peierls phases at 9.5, 95, and 190 GHz.
All nonmagnetic impurities (Si, Zn and Mg) were found to hardly
affect the position and linewidth of the single line resonance,
in spite of the moment formation due to the broken chains. In
contrast to Si, Zn, and Mg dopings, the presence of Ni (S = 1)
at low concentration induces a spectacular shift toward high
fields of the ESR line (up to 40% for x = 0.002), together with
a large broadening. This shift is strictly proportional to the
ratio of Ni to Cu susceptibilities: Hence it is strongly
enhanced below the spin-Peierls transition. We interpret this
shift and the broadening as due to the exchange field induced
by the Ni ions onto strongly exchange coupled Cu spins. Second,
the antiferromagnetic resonance was investigated in Ni-doped
samples. The frequency vs magnetic-field relation of the
resonance is well explained by the classical theory with
orthorhombic anisotropy, with g values remarkably reduced, in
accordance with the study of the spin-Peierls and paramagnetic
phases. The easy, second-easy, and hard axes are found to be a,
c, and b axes, respectively. These results, which are dominated
by the single ion anisotropy of Ni2+ are discussed in
comparison with those in the Zn- and Si-doped CuGeO3.