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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Spin-flop and spin-Peierls transition in doped CuGeO3
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Spin-flop and spin-Peierls transition in doped CuGeO3

机译：掺杂CuGeO3中的自旋翻转和自旋Peierls转变

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Ni++ ions doped inorganic CuGeO3 sample has been studied by using electron spin resonance (ESR) technique in the temperature range of 3-300 K. The ESR spectrum of Cu++ ion has been observed to be strongly temperature dependent for inorganic spin-PeierIS (SP) Cu0.96Ni0.04GeO3 samples. The ESR line width and ESR amplitude exponentially vanishes below a critical temperature, T-sp = 14 K. The one-dimensional (1D) antiferromagnetic (AF) spin chain formed of Cu++ is broken by Ni++ (spin-1) ion, giving uncoupled spins at the end of the chains that give extra contribution to the spectra at lower temperature and stabilizes a Neel state. The g-factor is much smaller than the expected value for isolated Cu++ and Ni" ions and is much more anisotropic than for undoped samples [O. Yalqm, B. Akta, J. Magn. Magn. Mater. 258/259 (2003) 137 (reference therein)]. It is shown that the ground state of dimerized spins is singlet. The spin-flop (SF) phenomenon is obtained from AF state mixed condition and then ferromagnetic (FM) state. The spin-flop field slightly increases when increasing temperature in the temperature range 100-300 K. The SF transition is showed almost AF order for Cu0.96Ni0,04GeO3. (c) 2006 Elsevier B.V. All rights reserved.
机译：使用电子自旋共振（ESR）技术在3-300 K的温度范围内研究了掺杂Ni ++离子的无机CuGeO3样品。据观察，Cu ++离子的ESR光谱强烈依赖于无机自旋PeierIS（SP）的温度。 Cu0.96Ni0.04GeO3样品。在临界温度T-sp = 14 K以下，ESR线宽和ESR振幅呈指数级消失。由Cu ++形成的一维（1D）反铁磁（AF）自旋链被Ni ++（spin-1）离子破坏，从而产生非耦合在链的末端旋转，这在较低温度下为光谱提供了额外的贡献并稳定了Neel状态。 g因子比隔离的Cu ++和Ni“离子的期望值小得多，并且与未掺杂的样品相比，各向异性要大得多[O. Yalqm，B. Akta，J. Magn。Magn。Mater。258/259（2003） [图137（参考文献）]表示二聚化的自旋的基态为单重态，从AF状态的混合状态到铁磁（FM）的状态，得到了自旋（SF）现象，自旋场稍微增加。 （c）2006 Elsevier BV保留所有权利。当在100-300 K的温度范围内增加温度时，SF过渡几乎显示为AF顺序，对于Cu0.96Ni0,04GeO3。

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