Abstract
The tunneling measurements on La0.625Ca0.375MnO3 strain free epitaxial thin films with an insulator-metal transition temperature (TIM) of 250 K were performed using variable temperature scanning tunneling microscopy and spectroscopy (STM/S). We find a depression in the DOS with a finite zero bias conductance (ZBC) signifying the presence of a pseudogap (PG) at all temperatures. With cooling, the ZBC is found to increase together with an increase in the PG energy of about 0.2 eV near the transition. The PG is a signature of the polarons while the increasing ZBC, in agreement with the bulk insulator-metal transition indicates the presence of free carriers at the Fermi energy.
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