测量了不同烧结温度制备的MgB2样品热电势从80K到320K随温度变化的行为,热电势为正值,在低温段呈线性行为,到了高温段逐渐偏离线性向下弯曲达到饱和或以更小的斜率线性变化,从多能带贡献对输运性质影响的角度分析了实验现象.
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