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Giant Positive Magnetoresistance In Fe Doped In2o3 And Inreo3 (Re=Eu,Nd) Composites, Germanas Peleckis, Xiaolin Wang, S X. Dou, P. Munroe, J. Ding, B. Lee
Giant Positive Magnetoresistance In Fe Doped In2o3 And Inreo3 (Re=Eu,Nd) Composites, Germanas Peleckis, Xiaolin Wang, S X. Dou, P. Munroe, J. Ding, B. Lee
Shi Xue Dou
Synthesis and characterization of Fe and rare earth (RE) (RE=Eu,Nd) codoped bulk In2O3 oxide are reported. Composites consisting of Fe-doped In2O3 and InREO3 phases were formed, as determined by x-ray diffraction and transmission electron microscopy, with particle sizes of 50–120 nm. The composites exhibit superparamagnetic and semiconducting behavior. A giant positive magnetoresistance is observed at low temperatures, reaching 81% and 50% at 5 K in Eu–Fe and Nd–Fe codoped samples, respectively.
Enhancement Of In-Field Jc In Mgb2 /Fe Wire Using Single- And Multiwalled Carbon Nanotubes, J. H. Kim, W. K. Yeoh, M. J. Qin, X. Xu, S. X. Dou
Enhancement Of In-Field Jc In Mgb2 /Fe Wire Using Single- And Multiwalled Carbon Nanotubes, J. H. Kim, W. K. Yeoh, M. J. Qin, X. Xu, S. X. Dou
Shi Xue Dou
The authors investigated the doping effects of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) on the Tc, lattice parameters, Jc(B), microstructure, and Hc2 of MgB2 /Fe wire. These effects systematically showed the following sequence for Tc and the α axis: the SWCNT doped wireMWshortCNT doped wireMWlongCNT doped wire wire, while Jc(B) followed the sequence of the SWCNT doped wire>the MWshortCNT doped wire>the MWlongCNT doped wire>undoped wire. A dominating mechanism behind all these findings is the level of C substitution for B in the lattice.
Large Positive Magnetoresistance Effect Below Curie Temperature In In1.90 − Xmn0.1snxo3, Xiaolin Wang, Germanas Peleckis, S X. Dou, R. S. Liu, J. G. Zhu
Large Positive Magnetoresistance Effect Below Curie Temperature In In1.90 − Xmn0.1snxo3, Xiaolin Wang, Germanas Peleckis, S X. Dou, R. S. Liu, J. G. Zhu
Shi Xue Dou
We report on the magnetoresistance (MR) and magnetic properties of In1.90−xMn0.1SnxO3 (0≤x ≤0.06) oxide. All samples were found to be ferromagnetic below TC=46 K. Sn doping changed In1.90Mn0.1O3 from an insulator to a highly conducting phase at 300 K. A positive MR effect was observed over a wide temperature range just below TC. Calculated MR values reached a maximum of 20% at 5 K. A change in the MR effect, from positive to negative, occurred under magnetic field H>4 T at 5 K. The results of x-ray absorption near-edge spectroscopy indicated that Mn ions are present both as Mn2+ …