Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-05-08
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 3 Postscript figures, uses revtex. Submitted to Phys. Rev. B, Rapid Communications
Scientific paper
We have measured the magnetic susceptibility of single-crystal Cu_{1-x}Ni_xGeO_3 to study doping effects of the magnetic impurity (Ni^{2+} has S=1 spin) on the inorganic spin-Peierls (SP) material CuGeO_3. We observed the disappearance of the SP transition and the abrupt increase of the Neel temperature from 2.5 to 3.4 K at x nearly equal to 0.020, which indicates the first-order phase transition between the dimerized-antiferromagnetic (D-AF) and the uniform-antiferromagnetic (U-AF) phases, as was discovered in Mg-doped (Mg^{2+} is nonmagnetic) system [T. Masuda et al., Phys. Rev. Lett. 80, 4566 (1998)]. This indicates that this transition is universal for the doping to Cu site. We also found another phase with the easy axis in the a-c plane in low x region.
Hayashi Tadashi
Ishimoto Hidehiko
Koide Naoki
Manabe Kei
Masuda Toshihiko
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