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Phase Transition between Dimerized-Antiferromagnetic and Uniform-Antiferromagnetic Phases in the Impurity-Doped Spin-Peierls Cuprate<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>CuGeO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
We report a first-order phase transition between dimerized-antiferromagnetic and uniform-antiferromagnetic phases in impurity-doped spin-Peierls (SP) cuprate ${\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Mg}}_{x}{\mathrm{GeO}}_{3}$. As Mg concentration increases, linear reduction of the SP transition temperature ( ${T}_{\mathrm{SP}}$) and linear increase of the N\'eel temperature ( ${T}_{N}$) are observed for $x$ up to ${x}_{c}\ensuremath{\simeq}0.023$. At ${x}_{c}$ the SP …