Infrared Hall effect in underdoped and optimally doped La$_{2-x}$Sr$_x$CuO$_4$

ORAL

Abstract

We report a study of magneto-optical properties in the mid-infrared region of a series of La$_{2-x}$Sr$_x$CuO$_4$ samples with hole doping level ranging from severely underdoped ($x=0.03$)to optimally doped ($x=0.15$). The Faraday rotation and circular dichroism are measured in a magnetic field of 8 Tesla and in a temperature range between 30K and 300K. The doping and temperature dependence of infrared Hall angle is found to be consistent with a simple Drude model. A significant increase of Hall frequency is observed when the hole doping level is reduced from optimal doping, which is consistent with a drastic reduction of the volume of Fermi surface in the underdoped sample. These results are similar to results of an earlier study of underdoped YBa2Cu3O6+x [L. B. Rigal, et al., Phys. Rev. Lett. 93,137002 (2004)]. Both experiments will be compared with theoretical models of the IR Hall effect.

*The support of NSF grant DMR-0303112 is acknowledged

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Authors

  • Lingyun Shi

  • Don Schmadel

    • Department of Physics, University of Maryland, College Park, Maryland 20742, USA
    • Department of Physics, University of Maryland, College Park, Maryland 20742 USA

  • H.D. Drew

    • Physics Dept., Univ. of Maryland, College Park, MD
    • Department of Physics, University of Maryland, College Park, Maryland 20742, USA
    • Physics Department, University of Maryland, College Park, MD 20742
    • University of Maryland, College Park, MD 20742
    • Department of Physics, University of Maryland, College Park, Maryland 20742 USA
    • University of Maryland

  • I. Tsukada

  • Y. Ando

    • Materials Science Research Laboratory, CRIEPI, Tokyo, Japan