Chemical potential shift and spectral weight transfer in Pr${}_{1-x}$Ca${}_x$MnO${}_3$ revealed by photoemission spectroscopy

Abstract

We have studied the chemical potential shift and changes in the electronic density of states near the Fermi level ($E_F$) as a function of carrier concentration in Pr${}_{1-x}$Ca${}_x$MnO${}_3$ (PCMO, $0.2\le x\le 0.65$) through the measurements of photoemission spectra. The results showed that the chemical potential shift was suppressed for $x \agt 0.3$, where the charge exchange (CE)-type antiferromagnetic charge-ordered state appears at low temperatures. We consider this observation to be related to charge self-organization such as stripe formation on a microscopic scale in this composition range. Together with the previous observation of monotonous chemical potential shift in La${}_{1-x}$Sr${}_x$MnO${}_3$, we conclude that the tendency toward the charge self-organization increases with decreasing bandwidth. In the valence band, spectral weight of the Mn 3$d$ $e_g$ electrons in PCMO was transferred from $\sim$ 1 eV below $E_F$ to the region near $E_F$ with hole doping, leading to a finite intensity at $E_F$ even in the paramagnetic insulating phase for $x \agt 0.3$, probably related with the tendency toward charge self-organization. The finite intensity at $E_F$ in spite of the insulating transport behavior is consistent with fluctuations involving ferromagnetic metallic states.

6 pages, 5 figures

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Cited by in corpus (10)

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• Near Fermi level Electronic Structure of Pr${}_{1-x}$Sr${}_x$MnO${}_3$: Photoemission Study
• Chemical potential shift induced by double-exchange and polaronic effects in Nd_{1-x}Sr_xMnO_3
• Temperature-dependent photoemission spectral weight transfer and chemical potential shift in Pr${}_{1-x}$Ca${}_x$MnO${}_3$ : Implications for charge density modulation
• A high resolution, hard x-ray photoemission investigation of La_(2-2x)Sr_(1+2x)Mn_2O_7 (0.30<x<0.50): on microscopic phase separation and the surface electronic structure of a bilayered CMR manganite
• Effect of reduced local lattice disorder on the magnetic properties of B-site substituted La0.8Sr0.2MnO3
• Pseudogap behavior of phase-separated Sm${}_{1-x}$Ca${}_x$MnO${}_3$ : A comparative photoemission study with double exchange
• Chemical potential landscape in band filling and bandwidth-control of manganites: Photoemission spectroscopy measurements
• Laboratory hard X-ray photoelectron spectroscopy of La${}_{1-x}$Sr${}_x$MnO${}_3$
• Pseudogap behavior in Pr${}_{0.5}$Sr${}_{0.5}$MnO${}_3$: A photoemission study