Excitation Spectra of Plane Site Cu Spins of Y0.52Pr0.48Ba2Cu3O7 (T_c~= 20 K)
Excitation Spectra of Plane Site Cu Spins of Y0.52Pr0.48Ba2Cu3O7 (T_c~= 20 K)
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Y0.52Pr0.48Ba2Cu3O7 平面位点 Cu 自旋的激发光谱 (T_c~= 20 K)
DOI：
10.1143/jpsj.63.4521
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发表时间：
1994
影响因子：
1.7
通讯作者：
K. Kakurai
中科院分区：
文献类型：
--
作者：
K. Kodama;S. Shamoto;H. Harashina;M. Sato;M. Nishi;K. Kakurai
对超导转变温度T c ≃20 K的Y 0.52 Pr 0.48 Ba 2 Cu 3 O 7 进行了中子非弹性散射测量。根据CuO 2 平面内Cu自旋激发的谱权函数χ''(q , ω)，估计了Pr取代Y引起的空穴载流子浓度的降低和随机性程度。这些结果证明 Fehrenbacher 和 Rice 提出的 Pr4f 和 O2p π 轨道杂化态的空穴捕获模型[Phys.莱特牧师。 [70 (1993) 3471]提供了与众所周知的通过Pr掺杂对R 1- x Pr x Ba 2 Cu 3 O 7 （R=Y或各种镧系元素）的T c 抑制相关的实验结果的适当解释。
Neutron inelastic scattering measurements have been carried out on Y 0.52 Pr 0.48 Ba 2 Cu 3 O 7 with the superconducting transition temperature T c ≃20 K. From the spectral weight function χ''( q , ω) of the Cu-spin excitations in the CuO 2 planes, the reduction of the hole-carrier concentration and the degree of the randomness induced by the substitution of Pr for Y are estimated. These results present evidences that the model of a hole-trapping by the hybridized states of the Pr4f and O2p π orbitals proposed by Fehrenbacher and Rice [Phys. Rev. Lett. 70 (1993) 3471] provides an appropriate explanation of the experimental results associated with the well-known T c -suppression of R 1- x Pr x Ba 2 Cu 3 O 7 (R=Y or various lanthanide elements) by the Pr-doping.