J. Phys. IV France 09 (1999) Pr10-251-Pr10-253
High field optical response ofZ. Zhu1, V.C. Long1, J.L. Musfeldt1, X. Wei2, J. Sarrao2, Z. Fisk2, H. Negishi3, M. Inoue3, H.-J. Koo4 and M.-H. Whangbo4
1 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.
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