Small fermi surface pockets in underdoped high temperature superconductors:: Observation of Shubnikov-de Haas oscillations in YBa2Cu4O8
Small fermi surface pockets in underdoped high temperature superconductors:: Observation of Shubnikov-de Haas oscillations in YBa2Cu4O8
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DOI：
10.1103/physrevlett.100.047004
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发表时间：
2008-02-01
影响因子：
8.6
通讯作者：
Hussey, N. E.
中科院分区：
文献类型：
--
作者：
Bangura, A. F.;Fletcher, J. D.;Hussey, N. E.
本文报道了在欠掺杂铜氧化物超导体YBa_2Cu_4 O_8（Y_（124））中观察到的Shubnikov-de哈斯振荡。对于沿c轴沿着排列的场，振荡的频率为660 +/-30 T，其对应于第一布里渊区的总面积的2.4%。这个轨道上准粒子的有效质量被测量为自由电子质量的2.7 +/- 0.3倍。频率和质量都与最近观察到的ortho-II YBa2Cu3O6.5（Y123-II）相当。我们表明，虽然小费米表面口袋可以预期从Y123-II的能带结构计算，没有这样的口袋预测Y124。因此，我们的研究结果意味着这些小口袋是一个通用的功能的氧化铜平面在欠掺杂的铜酸盐。
We report the observation of Shubnikov-de Haas oscillations in the underdoped cuprate superconductor YBa2Cu4O8 (Y124). For fields aligned along the c axis, the frequency of the oscillations is 660 +/- 30 T, which corresponds to similar to 2.4% of the total area of the first Brillouin zone. The effective mass of the quasiparticles on this orbit is measured to be 2.7 +/- 0.3 times the free electron mass. Both the frequency and mass are comparable to those recently observed for ortho-II YBa2Cu3O6.5 (Y123-II). We show that although small Fermi surface pockets may be expected from band-structure calculations in Y123-II, no such pockets are predicted for Y124. Our results therefore imply that these small pockets are a generic feature of the copper oxide plane in underdoped cuprates.