ISSN:
1573-7357
Keywords:
78.30
;
75.30.D
;
74.70
;
74.25
;
75.10.J
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Magnetic excitations and their role for the superconductivity in cuprate superconductors have been widely discussed in the literature. Here, we present a study of Y1−x Prx Ba2Cu3−yAlyO7−δ single crystals using Raman spectroscopy in an energy range of 50 – 10000 cm−1 Raman shift. The high energy range is dominated by a two-magnon scattering process at 3J, where J is the superexchange energy. In the Pr-123 single crystal, we find J = 720 cm−1, a damping of the one-magnon states Γ = 200 cm−1, and a resonance energy of 2.79eV for the two-magnon excitation. The two-magnon peak shows a continuous increase of the one-magnon damping with decreasing x and a nearly constant J across the phase transition to the superconductor. Especially, we find a weak two-magnon peak for a superconductor with a Tc = 86 K.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00768475
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