International Workshop on Electronic Crystals
ECRYS-99

J. Phys. IV France 09 (1999) Pr10-251-Pr10-253
DOI: 10.1051/jp4:19991063

High field optical response of

Z. Zhu¹, V.C. Long¹, J.L. Musfeldt¹, X. Wei², J. Sarrao², Z. Fisk², H. Negishi³, M. Inoue³, H.-J. Koo⁴ and M.-H. Whangbo<sup>4

1</sup>  Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902-6016, U.S.A.
²  National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306, U.S.A.
³  Graduate School of Advanced Science of Matter, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
⁴  Department of Chemistry, North Carolina State University, Raleigh, NC 27695, U.S.A.

Abstract
We report the polarized optical reflectance of quasi-two-dimensional η-Mo₄O₁₁ in a perpendicular magnetic field up to 30 T at 4.2 K. The in-field measurements are done on the conducting bc plane covering the 6000-26000 cm^-1 energy range. The absolute reflectance shows a free carrier response in the near infrared and two electronic transitions in the optical regime : an intraband transition (d → d) near 12000 cm^-1 and a charge transfer (oxygen p → molybdenum d) near 30000 cm^-1. In the magnetic field, no change in the normalized reflectance is observed in the intraband transition range through the 20 T Landau transition, whereas a notable deviation from unity is observed on the low-energy side of the charge transfer transition along both b and c polarizations. We discuss the results in terms of the effect of the magnetic field on the electronic structure and quantum limit response of η-Mo₄O₁₁.

© EDP Sciences 1999