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Relaxation study of elementary excitations in Bi2212 investigated by picosecond Raman spectroscopy

โœ Scribed by L. H. Machtoub; T. Suemoto; J. Shimoyama; K. Kishio

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
136 KB
Volume
33
Category
Article
ISSN
0377-0486

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โœฆ Synopsis

We report a relaxation study of elementary excitations in heavily underdoped Bi 2 Sr 2 CaCu 2 O 8+d (Bi2212) using picosecond Raman Spectroscopy. In B 1g symmetry, the two-magnon peak shows a super-linear power dependence which is ascribed to excess magnon population. In contrast, the broad feature observed in A 1g + B 2g symmetry shows a sub-linear power dependence, suggesting a different origin from the two-magnon scattering. We could recognize a time response <0.5 ps for the B 1g two-magnon peak. We also observed super-linear behavior in the power dependence of the 295 and 465 cm -1 anti-Stokes vibrational modes, in contrast to linear behavior on the Stokes side. We propose to explain the non-linear behavior in terms of non-equilibrium phonons.

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