Terahertz–infrared electrodynamics of overdoped manganites La1–xCaxMnO3. Kadyrov, L. S., Gorshunov, B. P., Zhukova, E. S., Torgashev, V. I., Prokhorov, A. S., Motovilova, E. A., Fischgrabe, F., Moshnyaga, V. T., Zhang, T., Kremer, R. K., Pracht, U., Zapf, S., Pokorný, J., Untereiner, G., Kamba, S., & Dressel, M. Phase Transitions, 87(10-11):1050–1059, November, 2014. Publisher: Taylor & Francis _eprint: https://doi.org/10.1080/01411594.2014.953508![Terahertz–infrared electrodynamics of overdoped manganites La1–xCaxMnO3 [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex We have measured low-temperature terahertz and infrared spectra of La1–xCa xMnO3 with x = 0.5; 0.6; 2/3, 0.7; 3/4, 0.85; 0.9; 0.95; 0.98 and x = 1 in the form of ceramics and epitaxial films. In the charge-ordered state for commensurate dopings (x = 2/3 and 3/4), we observed an absorption band at frequencies corresponding to the position of the lowest energy van Hove singularity in the folded Brillouin zone. The band is assigned to the boson peak. We observed qualitatively the same boson peak in Raman spectra of La1/3Ca2/3MnO3 ceramics. In antiferromagnetic phase, for the 0.5 ≤ x \textless 0.85 range of doping, the conductivity mechanism gradually changes from a hopping-like transport at low temperatures to the Drude behavior at elevated temperatures in the paramagnetic phase. For 0.85 ≤ x \textless 1 (canted antiferromagnetic phase), the electrons behave as Drude-like carriers in the whole temperature interval 5–300 K.
@article{kadyrov_terahertzinfrared_2014,
title = {Terahertz–infrared electrodynamics of overdoped manganites {La1}–{xCaxMnO3}},
volume = {87},
issn = {0141-1594},
url = {https://doi.org/10.1080/01411594.2014.953508},
doi = {10.1080/01411594.2014.953508},
abstract = {We have measured low-temperature terahertz and infrared spectra of La1–xCa xMnO3 with x = 0.5; 0.6; 2/3, 0.7; 3/4, 0.85; 0.9; 0.95; 0.98 and x = 1 in the form of ceramics and epitaxial films. In the charge-ordered state for commensurate dopings (x = 2/3 and 3/4), we observed an absorption band at frequencies corresponding to the position of the lowest energy van Hove singularity in the folded Brillouin zone. The band is assigned to the boson peak. We observed qualitatively the same boson peak in Raman spectra of La1/3Ca2/3MnO3 ceramics. In antiferromagnetic phase, for the 0.5 ≤ x {\textless} 0.85 range of doping, the conductivity mechanism gradually changes from a hopping-like transport at low temperatures to the Drude behavior at elevated temperatures in the paramagnetic phase. For 0.85 ≤ x {\textless} 1 (canted antiferromagnetic phase), the electrons behave as Drude-like carriers in the whole temperature interval 5–300 K.},
number = {10-11},
urldate = {2023-11-11},
journal = {Phase Transitions},
author = {Kadyrov, Lenar S. and Gorshunov, Boris P. and Zhukova, Elena S. and Torgashev, Victor I. and Prokhorov, Anatoly S. and Motovilova, Elizaveta A. and Fischgrabe, Florian and Moshnyaga, Vasily T. and Zhang, Tao and Kremer, Reinhard K. and Pracht, Uwe and Zapf, Sina and Pokorný, Jan and Untereiner, Gabriele and Kamba, Stanislav and Dressel, Martin},
month = nov,
year = {2014},
note = {Publisher: Taylor \& Francis
\_eprint: https://doi.org/10.1080/01411594.2014.953508},
keywords = {manganites, terahertz},
pages = {1050--1059},
}
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In the charge-ordered state for commensurate dopings (x = 2/3 and 3/4), we observed an absorption band at frequencies corresponding to the position of the lowest energy van Hove singularity in the folded Brillouin zone. The band is assigned to the boson peak. We observed qualitatively the same boson peak in Raman spectra of La1/3Ca2/3MnO3 ceramics. In antiferromagnetic phase, for the 0.5 ≤ x \\textless 0.85 range of doping, the conductivity mechanism gradually changes from a hopping-like transport at low temperatures to the Drude behavior at elevated temperatures in the paramagnetic phase. For 0.85 ≤ x \\textless 1 (canted antiferromagnetic phase), the electrons behave as Drude-like carriers in the whole temperature interval 5–300 K.","number":"10-11","urldate":"2023-11-11","journal":"Phase Transitions","author":[{"propositions":[],"lastnames":["Kadyrov"],"firstnames":["Lenar","S."],"suffixes":[]},{"propositions":[],"lastnames":["Gorshunov"],"firstnames":["Boris","P."],"suffixes":[]},{"propositions":[],"lastnames":["Zhukova"],"firstnames":["Elena","S."],"suffixes":[]},{"propositions":[],"lastnames":["Torgashev"],"firstnames":["Victor","I."],"suffixes":[]},{"propositions":[],"lastnames":["Prokhorov"],"firstnames":["Anatoly","S."],"suffixes":[]},{"propositions":[],"lastnames":["Motovilova"],"firstnames":["Elizaveta","A."],"suffixes":[]},{"propositions":[],"lastnames":["Fischgrabe"],"firstnames":["Florian"],"suffixes":[]},{"propositions":[],"lastnames":["Moshnyaga"],"firstnames":["Vasily","T."],"suffixes":[]},{"propositions":[],"lastnames":["Zhang"],"firstnames":["Tao"],"suffixes":[]},{"propositions":[],"lastnames":["Kremer"],"firstnames":["Reinhard","K."],"suffixes":[]},{"propositions":[],"lastnames":["Pracht"],"firstnames":["Uwe"],"suffixes":[]},{"propositions":[],"lastnames":["Zapf"],"firstnames":["Sina"],"suffixes":[]},{"propositions":[],"lastnames":["Pokorný"],"firstnames":["Jan"],"suffixes":[]},{"propositions":[],"lastnames":["Untereiner"],"firstnames":["Gabriele"],"suffixes":[]},{"propositions":[],"lastnames":["Kamba"],"firstnames":["Stanislav"],"suffixes":[]},{"propositions":[],"lastnames":["Dressel"],"firstnames":["Martin"],"suffixes":[]}],"month":"November","year":"2014","note":"Publisher: Taylor & Francis _eprint: https://doi.org/10.1080/01411594.2014.953508","keywords":"manganites, terahertz","pages":"1050–1059","bibtex":"@article{kadyrov_terahertzinfrared_2014,\n\ttitle = {Terahertz–infrared electrodynamics of overdoped manganites {La1}–{xCaxMnO3}},\n\tvolume = {87},\n\tissn = {0141-1594},\n\turl = {https://doi.org/10.1080/01411594.2014.953508},\n\tdoi = {10.1080/01411594.2014.953508},\n\tabstract = {We have measured low-temperature terahertz and infrared spectra of La1–xCa xMnO3 with x = 0.5; 0.6; 2/3, 0.7; 3/4, 0.85; 0.9; 0.95; 0.98 and x = 1 in the form of ceramics and epitaxial films. In the charge-ordered state for commensurate dopings (x = 2/3 and 3/4), we observed an absorption band at frequencies corresponding to the position of the lowest energy van Hove singularity in the folded Brillouin zone. The band is assigned to the boson peak. We observed qualitatively the same boson peak in Raman spectra of La1/3Ca2/3MnO3 ceramics. In antiferromagnetic phase, for the 0.5 ≤ x {\\textless} 0.85 range of doping, the conductivity mechanism gradually changes from a hopping-like transport at low temperatures to the Drude behavior at elevated temperatures in the paramagnetic phase. For 0.85 ≤ x {\\textless} 1 (canted antiferromagnetic phase), the electrons behave as Drude-like carriers in the whole temperature interval 5–300 K.},\n\tnumber = {10-11},\n\turldate = {2023-11-11},\n\tjournal = {Phase Transitions},\n\tauthor = {Kadyrov, Lenar S. and Gorshunov, Boris P. and Zhukova, Elena S. and Torgashev, Victor I. and Prokhorov, Anatoly S. and Motovilova, Elizaveta A. and Fischgrabe, Florian and Moshnyaga, Vasily T. and Zhang, Tao and Kremer, Reinhard K. and Pracht, Uwe and Zapf, Sina and Pokorný, Jan and Untereiner, Gabriele and Kamba, Stanislav and Dressel, Martin},\n\tmonth = nov,\n\tyear = {2014},\n\tnote = {Publisher: Taylor \\& Francis\n\\_eprint: https://doi.org/10.1080/01411594.2014.953508},\n\tkeywords = {manganites, terahertz},\n\tpages = {1050--1059},\n}\n\n\n\n","author_short":["Kadyrov, L. S.","Gorshunov, B. P.","Zhukova, E. S.","Torgashev, V. I.","Prokhorov, A. S.","Motovilova, E. A.","Fischgrabe, F.","Moshnyaga, V. T.","Zhang, T.","Kremer, R. 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