Singh, Udai Raj ; Chaudhuri, S. ; Budhani, R. C. ; Gupta, Anjan K. (2009) Polaronic pseudogap in the metallic phase of La0.625Ca0.375MnO3 thin films Journal of Physics: Condensed Matter, 21 (35). 355001_1-355001_6. ISSN 0953-8984
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Official URL: http://iopscience.iop.org/0953-8984/21/35/355001
Related URL: http://dx.doi.org/10.1088/0953-8984/21/35/355001
Abstract
The electronic density of states (DOS) of La0.625Ca0.375MnO3 (LCMO) strain-free epitaxial thin films with an insulator-metal transition temperature (TIM) of 250 K was probed using variable-temperature scanning tunneling microscopy and spectroscopy. We find a depression in the DOS with a finite zero bias conductance (ZBC) signifying a pseudogap in the 78-310 κtemperature range. With cooling, the ZBC is found to increase, indicating an increased DOS near EF. We interpret the pseudogap as a signature of Jahn-Teller polarons while the ZBC change, in agreement with the bulk insulator-metal transition, optical Drude peak and photoemission experiments, indicates the presence of free carriers at the Fermi energy in the metallic phase. The free carriers are discussed in terms of correlated polaronic states.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Institute of Physics Publishing. |
| ID Code: | 5725 |
| Deposited On: | 19 Oct 2010 11:19 |
| Last Modified: | 23 May 2011 06:59 |
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