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Spatially resolved tunneling spectroscopic studies of colossalmagnetoresistive (CMR) manganite $\rm La_{0.7}Ca_{0.3}MnO_3$ (LCMO) epitaxialfilms on $\rm (LaAlO_3)_{0.3}(Sr_2AlTaO_6)_{0.7}$ substrate are investigated asfunctions of temperature, magnetic field and spin polarization by means ofscanning tunneling spectroscopy. Systematic surveys of the tunneling spectrataken with Pt/Ir tips reveal spatial variations on the length scale of a fewhundred nanometers in the ferromagnetic state, which may be attributed to theintrinsic heterogeneity of the manganites due to their tendency towards phaseseparation. The electronic heterogeneity is found to decrease either withincreasing field at low temperatures or at temperatures above all magneticordering temperatures. On the other hand, spectra taken with Cr-coated tips areconsistent with convoluted electronic properties of both LCMO and Cr. Inparticular, for temperatures below the magnetic ordering temperatures of bothCr and LCMO, the magnetic-field dependent tunneling spectra may bequantitatively explained by the scenario of spin-polarized tunneling in aspin-valve configuration. Moreover, a low-energy insulating energy gap $\sim0.6$ eV commonly found in the tunneling conductance spectra of bulk metallicLCMO at $T \to 0$ may be attributed to a surface ferromagnetic insulating (FI)phase, as evidenced by its spin filtering effect at low temperatures andvanishing gap value above the Curie temperature. Additionally, temperatureindependent pseudogap (PG) phenomena existing primarily along the boundaries ofmagnetic domains are observed in the zero-field tunneling spectra. The PGbecomes strongly suppressed by applied magnetic fields at low temperatures whenthe tunneling spectra of LCMO become highly homogeneous. These findings suggestthat the occurrence PG is associated with the electronic heterogeneity of themanganites.

physical review. b, condensed matter and materials physics

Spin-polarized tunneling spectroscopic studies of the intrinsic  heterogeneity and pseudogap phenomena in colossal magnetoresistive manganite  La_{0.7}Ca_{0.3}MnO_{3}