Abstract
Current-driven breakdown of integer and fractional quantum Hall effects are studied in a wide range of magnetic fields up to 43 T using a pulsed magnet and a 3He refrigerator. An abrupt increase of magnetoresistance above a critical current was found at fractional filling, in a similar manner to the breakdown phenomena at integer fillings. Magnetic-field dependence of the critical electric fields of the breakdown is discussed in terms of the composite fermion picture. The electron heating model of the breakdown is discussed in comparison with the breakdown of integer quantum Hall effect.
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