Density of states and spatially inhomogeneous conductance near the metal-insulator transition in Pr(0.68)Pb(0.32)MnO(3) single crystals

作者：Wirth S^*; Roessler Sahana; Ernst S; Padmanabhan B; Bhat H L; Elizabeth Suja; Steglich F

来源：Journal of Physics: Condensed Matter , 2008, 20(43): 434231.

DOI：10.1088/0953-8984/20/43/434231

Single crystals of Pr(0.68)Pb(0.32)MnO(3) have been investigated by scanning tunneling microscopy over a broad temperature range. In this material, a distinct separation of the ferromagnetic and the metal-insulator transition temperature, T(C) approximate to 210 K and T(MI) approximate to 255 K, respectively, was observed. Spectroscopic tunneling studies revealed that even on a local scale the system switches from predominantly metallic to insulating within a narrow temperature range around T(MI). Inhomogeneities of the zero-bias conductance with small patches of metallic clusters on a length scale of 2-3 nm, however, were only obse

• 出版日期2008-10-29