Zn-neighbor Cu NQR in Zn-substituted YBa2Cu3O7-delta and YBa2Cu4O8

Article

关键词: NUCLEAR MAGNETIC-RELAXATION;    SPIN-LATTICE RELAXATION;    ELECTRIC-FIELD GRADIENTS;    D-WAVE SUPERCONDUCTOR;    HIGH-TC OXIDES;    IMPURITY-DOPED YBA2CU4O8;    QUADRUPOLE RESONANCE;    NORMAL-STATE;    NONMAGNETIC IMPURITY;    KNIGHT-SHIFTS;   

DOI  :  10.1103/PhysRevB.67.064516

来源: SCIE

【 摘 要 】

We studied local electronic states near Zn in optimally doped YBa2(Cu1-xZnx)(3)O7-delta and underdoped YBa2(Cu1-xZnx)(4)O-8 via satellite signals of plane-site Cu(2) nuclear quadrupole resonance (NQR) spectra. From the relative intensity of Cu NQR spectra, the satellite signals are assigned to Zn-neighbor Cu NQR lines. The Cu nuclear spin-lattice relaxation time of the satellite signal is shorter than that of the main signal, which indicates that the magnetic correlation is locally enhanced near Zn both for the underdoped and the optimally doped systems. The pure YBa2Cu4O8 is a stoichiometric, homogenous, underdoped electronic system; nevertheless, the Zn-induced inhomogeneous magnetic response in the CuO2 plane is more marked than that of the optimally doped YBa2Cu3O7-delta.

【 授权许可】

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