Spatial Inhomogeneities in Single-Crystal HgBa2CuO4+δ from 63Cu NMR Spin and Quadrupole Shifts
Spatial Inhomogeneities in Single-Crystal HgBa2CuO4+δ from 63Cu NMR Spin and Quadrupole Shifts
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DOI：
10.1007/s10948-008-0376-2
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发表时间：
2009-02
影响因子：
1.8
通讯作者：
D. Rybicki;D. Rybicki;J. Haase;M. Greven;G. Yu;Yuan Li;Y. Cho;Y. Cho;Xudong Zhao;Xudong Zhao
中科院分区：
文献类型：
--
作者：
D. Rybicki;D. Rybicki;J. Haase;M. Greven;G. Yu;Yuan Li;Y. Cho;Y. Cho;Xudong Zhao;Xudong Zhao
本文报道了单层高温超导体HgBa_2CuO_（4 +δ）单晶的~（63）Cu核磁共振（NMR）测量结果。从分析的四极卫星和它们的各向异性分裂一个很大程度上独立于温度的对称四极张量推导，尽管在Cu站点的电场梯度的实质性变化。强烈的温度依赖性的磁位移和线宽的63 Cu中心线为不同的磁场取向也揭示了实质性的自旋位移的变化在材料中。四重分裂和自旋位移两者的掺杂的线性依赖性，解释了在大的温度范围内所有的宽度与对应于2δ = 0.073的局部掺杂变化。
63Cu Nuclear Magnetic Resonance (NMR) measurements on a single crystal of the single-layer high-temperature superconductor HgBa2CuO4+δare reported. From the analysis of the quadrupolar satellites and their anisotropic splitting a largely temperature-independent symmetric quadrupole tensor is deduced, despite substantial variation in the electrical field gradients at the Cu site. The strongly temperature-dependent magnetic shifts and linewidths of the63Cu central line for different field orientations also reveal substantial spin shift variations in the material. Linear dependences on the doping of both, the quadruple splitting as well as the spin shifts, explain over a large temperature range all the widths with a local doping variation corresponding to 2δ≈0.073.