Electronic contribution to the isotope effects in PdHx, PdDx and PdTx
Electronic contribution to the isotope effects in PdHx, PdDx and PdTx
复制标题
电子对 PdHx、PdDx 和 PdTx 中同位素效应的贡献
DOI：
10.1088/0305-4608/16/6/008
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
G. Sicking
中科院分区：
文献类型：
--
作者：
H. Bakker;R. Griessen;N. Koeman;P. Albers;G. Sicking
利用de Haas-van Alphen实验，在低至1.4K的温度下，在高达11 T的电场中获得了稀钯-氚合金（PdTx为0<or=x<or=0.0011）的电子散射弛豫时间（丁格尔温度）和费米表面极限横截面面积A的浓度依赖性。氚在Pd中引起的费米表面极端横截面积d ln A/dx的相对变化在γ中心电子片（001）轨道上为0.31，在x空穴口袋轨道上为-2.5，在l空穴口袋轨道上为-11。此外，在稀钯氢合金和钯氘合金中，首次测量了第五带攀登架的一个极端横截面面积的浓度依赖性。这些实验结果表明，以前观察到的有趣的同位素效应仅限于布里渊区X点和L点的空穴椭球上的状态。由于与这些费米表面片相关的态密度仅占费米能态总密度的3%，因此，诸如磁化率和电子比热等宏观量的同位素效应太小而无法观察到。这与Blaurock（1983）和Wicke（1984）最近的测量结果一致。
The relaxation times for electron scattering (Dingle temperatures) and the concentration dependence of extremal cross-sectional areas A of the Fermi surface of dilute palladium-tritium alloys (PdTx with 0<or=x<or=0.0011) are obtained from the de Haas-van Alphen experiments in fields up to 11 T at temperatures down to 1.4K. The relative changes in extremal cross-sectional areas of the Fermi surface d ln A/dx induced by tritium in Pd are 0.31 for the (001) orbit on the Gamma centred electron sheet, -2.5 for orbits on the X-hole pockets and -11 for the L-hole pocket. Furthermore, for the first time the concentration dependence of one of the extremal cross-sectional areas of the fifth band jungle gym is measured in dilute palladium-hydrogen and palladium-deuterium alloys. The results of these experiments show that the intriguing isotope effects observed previously are confined to states on the hole ellipsoids at points X and L of the Brillouin zone. As the density of states associated with these Fermi surface sheets represents only 3% of the total density of states at the Fermi energy, isotope effects in macroscopic quantities such as magnetic susceptibility and electronic specific heat are too small to be observed. This is in agreement with recent measurements by Blaurock (1983) and Wicke (1984).