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Differential resistances of QHR were measured with increasing magnetic field from zero to 14T at 0.3K by dual frequency current combinations of 10kHz and 10.0001 kHz, 10kHz and 100.0001kHz, 900kHz and 900.0001kHz. A few thousands data of 0.1 Hz voltages were added by Excel software and then the QHR steps constructed again. One of the two samples were tested and got sharp steps at 900kHz as measured...
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