Evidence for two distinct energy scales in the Raman spectra of YBa2(CuNi)O6.95

Abstract

We report low energy electronic Raman scattering from Ni-substituted YBa2Cu3O6.95 single crystals with Tc ranging from 92.5 K to 78 K. The fully symmetrical A1g channel and the B1g channel which is sensitive to the dx2-y2 gap maximum have been explored. The energy of the B1g pair-breaking peak remains constant under Ni doping while the energy of the A1g peak scales with Tc (EA1g/Tc=5). Our data show that the A1g peak tracks the magnetic resonance peak observed in inelastic neutron scattering yielding a key explanation to the long-standing problem of the origin the A1g peak.

10 pages, 4 figures and 1 table

References in corpus (6)

• Neutron Scattering from Magnetic Excitations in Bi_2 Sr_2 Ca_2 O_8+delta
• Evolution of the resonance and incommensurate spin fluctuations in superconducting YBa${}_2$Cu${}_3$O${}_{6+x}$
• New magnetic coherence effect in superconducting La_{2-x}Sr_{x}CuO_{4}
• Quantum Impurities and the Neutron Resonance Peak in $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_7$: Ni versus Zn
• Collective Spin Fluctuation Mode and Raman Scattering in Superconducting Cuprates
• Electronic Raman scattering in the single-CuO2 layered superconductor Tl2Ba2CuO6+x

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