Nuclear-spin-related resistance enhancements observed over a wide range of magnetic fields

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Slow enhancements in the longitudinal resistance (Rxx) due to nuclear spin polarization are studied around Landau-level filling factors of v=2/3 and 3/5 as functions of both the filling factor and magnetic field. The Rxx enhancement appears not only at the v=2/3 and 3/5 spin transitions observed around magnetic fields of B =6.9 and 8.6 T respectively, but also over extended regions at higher and lower magnetic fields along the "flanks" of the v=2/3 and 3/5 quantum Hall states. Analyses based on the coincidence of spin-split Landau levels for composite fermions provide reasonable account of the Rxx enhancements observed in a wide range of magnetic field.

Original languageEnglish
Article number153306
Pages (from-to)153306-1-153306-3
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number15
Publication statusPublished - 2004 Apr


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