Shifting of the magnetic resonance peak to lower energy in the superconducting state of underdoped YBa_2Cu_3O_{6.8}

Abstract

Inelastic neutron scattering has been used to determine the dynamic spin fluctuations in an underdoped high temperature superconductor YBCO_{6.8} single crystal. The magnetic resonance, that occurs around 40 meV in overdoped samples, is shifted to a lower energy, E_r= 34 meV. A constant ratio, $E_r/k_B{T}_C=4.9\pm 0.2$, almost independent of the doping level, is found. According to numerous theoretical approaches, this finding supports the idea that the resonance energy is proportional (approximately twice) to the superconducting gap.

8 pages, 3 figures, accepted in Europhysics Letter

References in corpus (6)

• Theory of the Resonant Neutron Scattering of High $T_c$ Superconductors
• Superconductivity-Induced Anomalies in the Spin Excitation Spectra of Underdoped YBa_2 Cu_3 O_{6+x}
• Theory of Neutron Scattering in the Normal and Superconducting State of YBCO
• Magnetic Dynamics in Underdoped YBCO: Direct Observation of a Superconducting Gap
• Neutron scattering and superconducting order parameter in YBa2Cu3O7
• Antiferromagnetic Excitations and Van Hove Singularities in YBa${}_2$Cu${}_3$O${}_{6+x}$

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• Spin Susceptibility in Underdoped $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6+\mathbf{x}}$
• High energy spin excitations in YBa_2 Cu_3 O_{6.5}
• Effect of Nonmagnetic Impurities on the Magnetic Resonance Peak in YBa2Cu3O7
• Linear dependence of peak width in $χ(\bq, ω)$ vs T_c for YBCO superconductors
• On Measuring Condensate Fraction in Superconductors
• Impurity effects on the spin excitation spectra in a d-wave superconductor
• Quasi-One-Dimensional Topological-Excitation Liquid in Bi2212 from Tunneling Spectroscopy
• A critical examination of the spin dynamics in high-$T_C$ cuprates
• c-Axis Phase Coherence and Spin Fluctuations in Cuprates
• Separation of magnetic and superconducting behaviour in YBCO6.33 (Tc=8.4 K)
• Convergence of energy-dependent incommensurate antiferromagnetic neutron scattering peaks to commensurate resonance in underdoped bilayer cuprates