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I–V curves showing negative differential resistance (NDR) are reported for single crystals of Co2FeO2BO3 at 315K and 290K and for Fe3O2BO3 at 300K, 260K and 220K. Resistivity measurements are presented for both systems, parallel and perpendicular to the c axis, in the range 315–120K. The high hysteretic behavior of the I–V curves in Co2FeO2BO3 around room temperature is discussed and the heat dissipated...
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