Transport properties of LaCu2Si2 and CeCu2Si2 between 1.5K and 300K
Transport properties of LaCu2Si2 and CeCu2Si2 between 1.5K and 300K
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LaCu2Si2 和 CeCu2Si2 在 1.5K 和 300K 之间的传输特性
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
D. Wohlleben
中科院分区：
文献类型：
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作者：
W. Franz;A. Griessel;F. Steglich;D. Wohlleben
本文报道了CeCu_2Si_2反常化合物和LaCu_2Si_2参比化合物在1.5 - 300 K之间的电阻率ρ、热导率k和热电势S的测量结果。对于LaCu_2Si_2，ρ和S的温度依赖关系与其它d带金属的结果雅阁。对于CeCu 2Si 2，观察到的电阻率（200 K时ρ = 220 µΩ cm）导致非常短的电子平均自由程，其数量级为Ce-Ce间距。相应地，k几乎等于声子贡献kp。在20 K以下，电阻率和热电势强烈地表明费米液体行为，其“简并温度”在20 K和40 K之间。在200 K以上，ρ和S都与−ln（T/1 K）成比例地减小。
We report measurements of the electrical resistivityρ, the thermal conductivityk and the thermoelectric powerS between 1.5K and 300K on the anomalous CeCu2Si2 compound and on LaCu2Si2 as reference compound. For LaCu2Si2 the temperature dependences ofρ andS are in accord with those found in otherd band metals. For CeCu2Si2 the observed resistivity (ρ≃220 µΩ cm at 200K) leads to a very short electronic mean free path which is of the order of the Ce-Ce spacing. Correspondingly,k is almost identical with the phonon contributionkp. Below 20K, resistivity and thermoelectric power strongly suggest Fermi liquid behavior with a “degeneracy temperature” between 20K and 40K. Above 200K, bothρ andS decrease proportionally to −ln(T/1 K).