Quantum Impurities and the Neutron Resonance Peak in $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_7$: Ni versus Zn

Abstract

The influence of magnetic (S=1) and nonmagnetic (S=0) impurities on the spin dynamics of an optimally doped high temperature superconductor is compared in two samples with almost identical superconducting transition temperatures: YBa${}_2$(Cu${}_{0.97}$Ni${}_{0.03}$)${}_3$O${}_7$ (T${}_c$=80 K) and YBa${}_2$(Cu${}_{0.99}$Zn${}_{0.01}$)${}_3$O${}_7$ (T${}_c$=78 K). In the Ni-substituted system, the magnetic resonance peak (which is observed at E${}_r\simeq$40 meV in the pure system) shifts to lower energy with a preserved E${}_r$/T${}_c$ ratio while the shift is much smaller upon Zn substitution. By contrast Zn, but not Ni, restores significant spin fluctuations around 40 meV in the normal state. These observations are discussed in the light of models proposed for the magnetic resonance peak.

3 figures, submitted to PRL

References in corpus (5)

• Neutron Scattering from Magnetic Excitations in Bi_2 Sr_2 Ca_2 O_8+delta
• Slave Boson Approach to The Neutron Scattering in YBCO Superconductors
• Normal State Magnetic Properties of Ni and Zn Substituted in YBa_{2}Cu_{3} O_{6+x}: Hole-Doping Dependence
• Effect of Nonmagnetic Impurities on the Magnetic Resonance Peak in YBa2Cu3O7
• Impurity-induced spin polarization and NMR line broadening in underdoped cuprates

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