Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-07-28
Physical Review B, Rapid Communications 80, 100404 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 4 figures
Scientific paper
We present temperature-dependent scanning tunneling spectroscopy measurements on $La_{1-x}Ca_{x}MO_{3}$ ($x\sim0.33$) films with different degrees of biaxial strain. A depletion in normalized conductance around the Fermi level is observed both above and below the insulator-to-metal transition temperature $T_{MI}$, for weakly as well as highly-strained films. This pseudogap-like depletion globally narrows on cooling. The zero-bias conductance decreases on cooling in the insulating phase, reaches a minimum close to $T_{MI}$ and increases on cooling in the metallic phase, following the trend of macroscopic conductivity. These results support a recently proposed scenario in which dynamical short-range antiferromagnetic/charge order correlations play a preeminent role in the transport properties of colossal magnetoresistive manganites [R. Yu \textit{et al}., Phys. Rev. B \textbf{77}, 214434 (2008)].
Fasano Yanina
Fischer Øystein
Koller Edmond
Lortz Rolf
Maggio-Aprile Ivan
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