PMID: 11909497Mar 23, 2002Paper

Coherent magnetic oscillation in the spin ladder system alpha(')- NaV2O5

Physical Review Letters
H KamiokaT Suemoto

Abstract

We report the first observation of coherent magnetic excitations in a spin ladder system NaV2O5 by using femtosecond time-domain spectroscopy. A pronounced coherent oscillation is observed at 127 cm(-1) (nearly twice the spin gap energy) and assigned to a two-magnon bound state, based on the temperature dependence of the intensity below the charge ordering phase transition at T(C) = 34 K. This mode can be observable only when circularly polarized light is used as a pump or a probe beam, suggesting that it corresponds to a spin-flip excitation from the singlet ground state. A phonon mode strongly coupled to the spin state is also found at 303 cm(-1).

References

Oct 1, 1996·Physical Review. B, Condensed Matter·G S Uhrig, H J Schulz
Oct 1, 1996·Physical Review. B, Condensed Matter·V N MuthukumarF Steglich
Jan 1, 1992·Physical Review. B, Condensed Matter·H J ZeigerM S Dresselhaus
Feb 15, 1993·Physical Review. B, Condensed Matter·T DekorsyH Kurz

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