Chemical potential shift induced by double-exchange and polaronic effects in Nd_{1-x}Sr_xMnO_3

Abstract

We have studied the chemical potential shift as a function of temperature in Nd${}_{1-x}$Sr${}_x$MnO${}_3$ (NSMO) by measurements of core-level photoemission spectra. For ferromagnetic samples ($x=0.4$ and 0.45), we observed an unusually large upward chemical potential shift with decreasing temperature in the low-temperature region of the ferromagnetic metallic (FM) phase. This can be explained by the double-exchange (DE) mechanism if the $e_g$ band is split by dynamical/local Jahn-Teller effect. The shift was suppressed near the Curie temperature ($T_C$), which we attribute to the crossover from the DE to lattice-polaron regimes.

5 pages, 6 figures

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Cited by in corpus (2)

• Electronic Structure of Noncentrosymmetric Superconductor Li${}_2$(Pd${}_x$Pt${}_{1-x}$3)B Studied by Photoemission Spectroscopy
• Chemical potential landscape in band filling and bandwidth-control of manganites: Photoemission spectroscopy measurements