CuGe1-xGaxO3的低温磁性质
LOW TEMPERATURE MAGNETIC PROPERTIES OF CuGe1-xGaxO3
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摘要: 制备了单相性很好的CuGaxGe1-xO3(x=0,0.01)多晶样品,在不同磁场下对其低温磁化率进行了测量.Ga的掺杂所产生的O空穴导致CuO6八面体的畸变,使b轴的晶格参数变小.Ga掺杂抑制了Spin-Peierls相变的温度并使自旋单态-三重态之间的能隙减小.磁场对能隙有抑制作用,同时使参与Spin-Peierls相变的Cu2+离子数减少,另一方面,磁场能增加不参与双聚化的Cu2+(即Cu2+自由自旋)的数目.
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关键词:
- CuGeO3 /
- Spin-Peierls相变 /
- 低温直流磁化率
Abstract: The polycrystalline samples of single-phase CuGaxGe1-xO3(x=0,0.01) are synthesized. Their low-temperature magnetic susceptibility are measured under different magnetic fields. The oxygen holes generated by Ga doping induce the distortion of the CuO6 octahedron, and cause b axis of the crystal lattice to become shorter. Ga doping decreases the spin-Peierls transition temperature and also the energy gap between the spin singlet-state and the triplet-state. The magnetic fields have the effectiveness of inhibiting the energy gap, meanwhile, reducing the spin number of Cu2+ ions that are involved in the spin-Peierls phase transition. On the other hand, the magnetic field increases the free spin number of Cu2+ ions. -
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