Physics – Condensed Matter – Superconductivity
Scientific paper
1997-04-11
Europhys. Lett. 38 (4), 313-318 (1997)
Physics
Condensed Matter
Superconductivity
8 pages, 3 figures, accepted in Europhysics Letter
Scientific paper
10.1209/epl/i1997-00244-6
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.
Bossy J.
Bourges Ph.
Burlet P.
Couach M.
Henry J.-Y.
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