Spectroscopic studies of inhomogeneous electronic phases in colossal magnetoresistance and charge-ordering compounds

S. L. Cooper, H. L. Liu, S. Yoon, Sang-Wook Cheong, Z. Fisk

Research output: Contribution to journalArticle

Abstract

Infrared reflectance and Raman spectroscopy measurements have been performed through the metal-semiconductor (or-semimetal) transitions of various "colossal magnetoresistance" and charge-ordering materials, including EuB6 and the manganese perovskites. As described in this paper, our results demonstrate that these systems have phase regions characterized by electronic inhomogeniety of various types, including: (1) pure spin polarons, which form in a narrow temperature range above Tc in the "colossal magnetoresistance" system EuB6; (2) magnetoelastic polarons, and an inhomogeneous ferromagnetic phase comprised of both metallic and insulating regions, in the "colossal magnetoresistance" regime of La1-x(Sr, Ca)xMnO3 (x < 0.5); and (3) phase separation behavior involving coexisting ferromagnetic and antiferromagnetic domains in the intermediate-temperature (CO) phase of the charge-ordering system Bi1-xCaxMnO3 (x > 0.5).

Original languageEnglish (US)
Pages (from-to)167-176
Number of pages10
JournalMaterials Research Society Symposium-Proceedings
Volume602
StatePublished - Jan 1 2000

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Colossal magnetoresistance
polarons
Polarons
metalloids
perovskites
electronics
manganese
Metalloids
Raman spectroscopy
Manganese
reflectance
Metals
metals
Semiconductor materials
spectroscopy
Infrared radiation
temperature
Temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Science(all)

Cite this

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abstract = "Infrared reflectance and Raman spectroscopy measurements have been performed through the metal-semiconductor (or-semimetal) transitions of various {"}colossal magnetoresistance{"} and charge-ordering materials, including EuB6 and the manganese perovskites. As described in this paper, our results demonstrate that these systems have phase regions characterized by electronic inhomogeniety of various types, including: (1) pure spin polarons, which form in a narrow temperature range above Tc in the {"}colossal magnetoresistance{"} system EuB6; (2) magnetoelastic polarons, and an inhomogeneous ferromagnetic phase comprised of both metallic and insulating regions, in the {"}colossal magnetoresistance{"} regime of La1-x(Sr, Ca)xMnO3 (x < 0.5); and (3) phase separation behavior involving coexisting ferromagnetic and antiferromagnetic domains in the intermediate-temperature (CO) phase of the charge-ordering system Bi1-xCaxMnO3 (x > 0.5).",
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Spectroscopic studies of inhomogeneous electronic phases in colossal magnetoresistance and charge-ordering compounds. / Cooper, S. L.; Liu, H. L.; Yoon, S.; Cheong, Sang-Wook; Fisk, Z.

In: Materials Research Society Symposium-Proceedings, Vol. 602, 01.01.2000, p. 167-176.

Research output: Contribution to journalArticle

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AU - Cooper, S. L.

AU - Liu, H. L.

AU - Yoon, S.

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AU - Fisk, Z.

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AB - Infrared reflectance and Raman spectroscopy measurements have been performed through the metal-semiconductor (or-semimetal) transitions of various "colossal magnetoresistance" and charge-ordering materials, including EuB6 and the manganese perovskites. As described in this paper, our results demonstrate that these systems have phase regions characterized by electronic inhomogeniety of various types, including: (1) pure spin polarons, which form in a narrow temperature range above Tc in the "colossal magnetoresistance" system EuB6; (2) magnetoelastic polarons, and an inhomogeneous ferromagnetic phase comprised of both metallic and insulating regions, in the "colossal magnetoresistance" regime of La1-x(Sr, Ca)xMnO3 (x < 0.5); and (3) phase separation behavior involving coexisting ferromagnetic and antiferromagnetic domains in the intermediate-temperature (CO) phase of the charge-ordering system Bi1-xCaxMnO3 (x > 0.5).

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