Photoemission study of perovskite-type manganites with stripe ordering

K. Ebata; H. Wadati; M. Takizawa; K. Maekawa; A. Fujimori; A. Chikamatsu; H. Kumigashira; M. Oshima; Y. Tomioka; H. Kuwahara; Y. Tokura

doi:10.1007/s10948-007-0271-2

Photoemission study of perovskite-type manganites with stripe ordering

K. Ebata, H. Wadati, M. Takizawa, K. Maekawa, A. Fujimori, A. Chikamatsu, H. Kumigashira, M. Oshima, Y. Tomioka, H. Kuwahara, Y. Tokura

Research output: Contribution to journal › Article › peer-review

Abstract

We have studied the chemical potential shift and changes in the electronic density of states near the Fermi level (E _F) as functions of temperature and carrier concentration in Pr _1-x Ca _x MnO ₃ (PCMO) and Nd _1-x Sr _x MnO ₃ (NSMO) by measurements of photoemission spectra. Suppression of the chemical potential shift as a function of carrier concentration has been observed in PCMO and NSMO near and in the composition range where the CE-type antiferromagnetic charge-ordered (CO) phase appears at low temperatures. This result indicates that there is charge self-organization on a microscopic scale such as stripe formation in this composition range. In the ferromagnetic metallic phase of NSMO, we found a large temperature-dependent chemical potential shift at low temperatures and attributed this to double-exchange mechanism. Suppression of the temperature-dependent chemical potential shift near Curie temperature was observed, possibly associated with the formation of correlated polarons. In the valence band near the E _F of PCMO, spectral weight was transferred with hole doping, leading to a finite intensity at E _F even in the paramagnetic insulating phase above the CO phase for x ≳ 0.3, and as the temperature was lowered, a clear gap opening was observed in the CO phase.

Original language	English
Pages (from-to)	543-546
Number of pages	4
Journal	Journal of Superconductivity and Novel Magnetism
Volume	20
Issue number	7-8
DOIs	https://doi.org/10.1007/s10948-007-0271-2
Publication status	Published - 2007 Nov
Externally published	Yes

Keywords

CMR
Charge order
Manganites
Phase separation
Photoemission

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1007/s10948-007-0271-2

Cite this

@article{1365e090aacf4bee847dc55be4d294fe,

title = "Photoemission study of perovskite-type manganites with stripe ordering",

abstract = "We have studied the chemical potential shift and changes in the electronic density of states near the Fermi level (E F) as functions of temperature and carrier concentration in Pr 1-x Ca x MnO 3 (PCMO) and Nd 1-x Sr x MnO 3 (NSMO) by measurements of photoemission spectra. Suppression of the chemical potential shift as a function of carrier concentration has been observed in PCMO and NSMO near and in the composition range where the CE-type antiferromagnetic charge-ordered (CO) phase appears at low temperatures. This result indicates that there is charge self-organization on a microscopic scale such as stripe formation in this composition range. In the ferromagnetic metallic phase of NSMO, we found a large temperature-dependent chemical potential shift at low temperatures and attributed this to double-exchange mechanism. Suppression of the temperature-dependent chemical potential shift near Curie temperature was observed, possibly associated with the formation of correlated polarons. In the valence band near the E F of PCMO, spectral weight was transferred with hole doping, leading to a finite intensity at E F even in the paramagnetic insulating phase above the CO phase for x ≳ 0.3, and as the temperature was lowered, a clear gap opening was observed in the CO phase.",

keywords = "CMR, Charge order, Manganites, Phase separation, Photoemission",

author = "K. Ebata and H. Wadati and M. Takizawa and K. Maekawa and A. Fujimori and A. Chikamatsu and H. Kumigashira and M. Oshima and Y. Tomioka and H. Kuwahara and Y. Tokura",

note = "Funding Information: Acknowledgement This work was supported by a Grant-in-Aid for Scientific Research in Priority Area “Invention of Anomalous Quantum Materials” from the Ministry of Education, Culture, Sports, Science and Technology, Japan. This work was done under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2005G101).",

year = "2007",

month = nov,

doi = "10.1007/s10948-007-0271-2",

language = "English",

volume = "20",

pages = "543--546",

journal = "Journal of Superconductivity and Novel Magnetism",

issn = "1557-1939",

publisher = "Springer New York",

number = "7-8",

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TY - JOUR

T1 - Photoemission study of perovskite-type manganites with stripe ordering

AU - Ebata, K.

AU - Wadati, H.

AU - Takizawa, M.

AU - Maekawa, K.

AU - Fujimori, A.

AU - Chikamatsu, A.

AU - Kumigashira, H.

AU - Oshima, M.

AU - Tomioka, Y.

AU - Kuwahara, H.

AU - Tokura, Y.

N1 - Funding Information: Acknowledgement This work was supported by a Grant-in-Aid for Scientific Research in Priority Area “Invention of Anomalous Quantum Materials” from the Ministry of Education, Culture, Sports, Science and Technology, Japan. This work was done under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2005G101).

PY - 2007/11

Y1 - 2007/11

N2 - We have studied the chemical potential shift and changes in the electronic density of states near the Fermi level (E F) as functions of temperature and carrier concentration in Pr 1-x Ca x MnO 3 (PCMO) and Nd 1-x Sr x MnO 3 (NSMO) by measurements of photoemission spectra. Suppression of the chemical potential shift as a function of carrier concentration has been observed in PCMO and NSMO near and in the composition range where the CE-type antiferromagnetic charge-ordered (CO) phase appears at low temperatures. This result indicates that there is charge self-organization on a microscopic scale such as stripe formation in this composition range. In the ferromagnetic metallic phase of NSMO, we found a large temperature-dependent chemical potential shift at low temperatures and attributed this to double-exchange mechanism. Suppression of the temperature-dependent chemical potential shift near Curie temperature was observed, possibly associated with the formation of correlated polarons. In the valence band near the E F of PCMO, spectral weight was transferred with hole doping, leading to a finite intensity at E F even in the paramagnetic insulating phase above the CO phase for x ≳ 0.3, and as the temperature was lowered, a clear gap opening was observed in the CO phase.

AB - We have studied the chemical potential shift and changes in the electronic density of states near the Fermi level (E F) as functions of temperature and carrier concentration in Pr 1-x Ca x MnO 3 (PCMO) and Nd 1-x Sr x MnO 3 (NSMO) by measurements of photoemission spectra. Suppression of the chemical potential shift as a function of carrier concentration has been observed in PCMO and NSMO near and in the composition range where the CE-type antiferromagnetic charge-ordered (CO) phase appears at low temperatures. This result indicates that there is charge self-organization on a microscopic scale such as stripe formation in this composition range. In the ferromagnetic metallic phase of NSMO, we found a large temperature-dependent chemical potential shift at low temperatures and attributed this to double-exchange mechanism. Suppression of the temperature-dependent chemical potential shift near Curie temperature was observed, possibly associated with the formation of correlated polarons. In the valence band near the E F of PCMO, spectral weight was transferred with hole doping, leading to a finite intensity at E F even in the paramagnetic insulating phase above the CO phase for x ≳ 0.3, and as the temperature was lowered, a clear gap opening was observed in the CO phase.

KW - CMR

KW - Charge order

KW - Manganites

KW - Phase separation

KW - Photoemission

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SN - 1557-1939

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SP - 543

EP - 546

JO - Journal of Superconductivity and Novel Magnetism

JF - Journal of Superconductivity and Novel Magnetism

IS - 7-8

ER -

Photoemission study of perovskite-type manganites with stripe ordering

Abstract

Keywords

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