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Excitation modes in the range $2/5 \geq \nu \geq 1/3$ of the fractionalquantum Hall regime are observed by resonant inelastic light scattering.Spectra of spin reversed excitations suggest a structure of lowest spin-splitLandau levels of composite fermions that is similar to that of electrons.Spin-flip energies determined from spectra reveal significant composite fermioninteractions. The filling factor dependence of mode energies display an abruptchange in the middle of the range when there is partial population of acomposite fermion level.Comment: 5 pages, 4 figure

physical review letters

Evidence of Landau Levels and Interactions in Low-Lying Excitations of Composite Fermions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn><mml:mo>≤</mml:mo><mml:mi>ν</mml:mi><mml:mo>≤</mml:mo><mml:mn>2</mml:mn><mml:mo>/</mml:mo><mml:mn>5</mml:mn></mml:math>

Evidence of Landau Levels and Interactions in Low-Lying Excitations of Composite Fermions at1/3≤ν≤2/5