Chemical potential shift and spectral-weight transfer in Pr_1–xCa_xMnO₃ revealed by photoemission spectroscopy

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K. Ebata,¹ H. Wadati,¹ M. Takizawa,¹ A. Fujimori,¹ A. Chikamatsu,² H. Kumigashira,² M. Oshima,² Y. Tomioka,³ and Y. Tokura^3,4,5
¹Department of Complexity Science and Engineering and Department of Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwashi, Chiba, 277-8561, Japan
²Department of Applied Chemistry, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
³Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan
⁴Department of Applied Physics, University of Tokyo Bunkyo-ku, Tokyo 113-8656, Japan
⁵Spin Superstructure Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Corporation (JST), Tsukuba 305-8562, Japan

Received 13 June 2006; published 24 August 2006

Wehave studied the chemical potential shift and changes in theelectronic density of states near the Fermi level (E_F) asa function of carrier concentration in Pr_1–xCa_xMnO₃ (PCMO, 0.2x0.65) throughthe measurements of photoemission spectra. The results showed that thechemical potential shift was suppressed for x0.3, where the charge-exchange(CE) type antiferromagnetic charge-ordered state appears at low temperatures. Weconsider this observation to be related to charge self-organization suchas stripe formation on a microscopic scale in this compositionrange. Together with the previous observation of monotonous chemical potentialshift in La_1–xSr_xMnO₃, we conclude that the tendency toward thecharge self-organization increases with decreasing bandwidth. In the valence band,spectral weight of the Mn 3d e_g electrons in PCMOwas transferred from ~1 eV below E_F to the region nearE_F with hole doping, leading to a finite intensity atE_F even in the paramagnetic insulating phase for x0.3, probablyrelated with the tendency toward charge self-organization. The finite intensityat E_F in spite of the insulating transport behavior isconsistent with fluctuations involving ferromagnetic metallic states.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.064419
DOI:	10.1103/PhysRevB.74.064419
PACS:	75.47.Lx; 75.47.Gk; 71.28.+d; 79.60.-i 75.47.Lx Magnetotransport in manganites 75.47.Gk Colossal magnetoresistance 71.28.+d Narrow-band systems; intermediate-valence solids 79.60.-i Photoemission and photoelectron spectra (condensed matter) YEAR: 2006
KEYWORDS:	praseodymium compounds, calcium compounds, chemical potential, photoelectron spectra, electronic density of states, Fermi level, carrier density, charge exchange, antiferromagnetic materials, valence bands, ferromagnetic materials

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