SMB6 - KONDO INSULATOR OR EXOTIC METAL
SMB6 - KONDO INSULATOR OR EXOTIC METAL
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DOI：
10.1103/physrevlett.74.1629
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发表时间：
1995-02-27
影响因子：
8.6
通讯作者：
CANFIELD, PC
中科院分区：
文献类型：
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作者：
COOLEY, C;ARONSON, MC;CANFIELD, PC
高压电阻率和霍尔效应测量表明，Sm B 6的激活能隙Δ在45 ~ 53 kbar之间不连续地消失，在高压下产生质量增强的费米液相。低温输运由具有不寻常的超么正性散射特性的差距中的扩展态主导，并且载流子密度随着Δ减小而几乎呈指数增长，在45 kbar以下接近0.15个电子/晶胞饱和。我们的研究结果是不一致的杂交间隙模型，并提出了一个惊人的平行莫特-哈伯德绝缘体。
High pressure resistivity and Hall effect measurements on Sm B 6 show that the activation gap Δ vanishes discontinuously between 45 and 53 kbar, yielding at high pressures a mass-enhanced Fermi liquid phase. The low temperature transport is dominated by extended states in the gap with unusual superunitarity scattering properties, and a carrier density which grows almost exponentially with reduced Δ, saturating below 45 kbar near 0.15 electron per unit cell. Our results are inconsistent with hybridization gap models and suggest a striking parallel to Mott-Hubbard insulators.