Pulsed Magnetic Field Measurements of the Composite Fermion Effective Mass

(Dept. of Physics; D.R. Leadley; J.J. Harris (Dept. of Elec. Eng.; M. van der Burgt; Nottingham University; Oxford University; R.J. Nicholas; UK); UK) C.T. Foxon (Dept. of Physics; University College London. UK)

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Pulsed Magnetic Field Measurements of the Composite Fermion Effective Mass

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arxiv cond-mat/9508059 v2 pith:QZZLGCYP submitted 1995-08-16 cond-mat

D.R. Leadley , M. van der Burgt , R.J. Nicholas , (Dept. of Physics , Oxford University , UK) C.T. Foxon (Dept. of Physics , Nottingham University , UK)

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J.J. Harris (Dept. of Elec. Eng. University College London. UK)

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abstract

Magnetotransport measurements of Composite Fermions (CF) are reported in 50 T pulsed magnetic fields. The CF effective mass is found to increase approximately linearly with the effective field $B^*$, in agreement with our earlier work at lower fields. For a $B^*$ of 14 T it reaches $1.6m_e$, over 20 times the band edge electron mass. Data from all fractions are unified by the single parameter $B^*$ for all the samples studied over a wide range of electron densities. The energy gap is found to increase like $\sqrt{B^*}$ at high fields.

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