SPIN GAP AND ANTIFERROMAGNETIC CORRELATIONS IN THE KONDO INSULATOR CENISN
SPIN GAP AND ANTIFERROMAGNETIC CORRELATIONS IN THE KONDO INSULATOR CENISN
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DOI：
10.1103/physrevlett.69.490
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发表时间：
1992-07-20
影响因子：
8.6
通讯作者：
PALSTRA, TTM
中科院分区：
文献类型：
--
作者：
MASON, TE;AEPPLI, G;PALSTRA, TTM
中子散射测量结果表明，交叉（在T小于或接近10 K）从金属重费米子半导体的行为与形成的间隙的磁激发谱的CeNiSn相一致。与绝缘体的简单能带图相反，差距仅在动量传递Q的特定值处才被很好地定义。虽然大量的反铁磁相关的a-c平面的特征低T状态，相应的零频率响应函数是Q无关的。
Neutron scattering measurements show that the crossover (at T less than or similar to 10 K) from metallic heavy-fermion to semiconducting behavior coincides with the formation of a gap in the magnetic excitation spectrum of CeNiSn. In contrast to the simple band picture of an insulator, the gap is well defined only at particular values of the momentum transfer Q. While substantial antiferromagnetic correlations in the a-c plane characterize the low-T state, the corresponding zero-frequency response function is Q independent.