Terahertz–infrared electrodynamics of overdoped manganites La1–xCaxMnO3
Terahertz–infrared electrodynamics of overdoped manganites La1–xCaxMnO3
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过掺杂锰氧化物 La1âxCaxMnO3 的太赫兹红外电动力学
DOI:
10.1080/01411594.2014.953508
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发表时间:
2014
影响因子:
1.6
通讯作者:
M.Dressel
中科院分区:
文献类型:
--
作者:
L. S.Kadyrov;B. Gorshunov;E.Zhukova;V. I.Torgashev;A.S.Prokhorov;E.A. Motovilova;F. Fischgrabe;V.Moshnyaga;T.Zhang;R.Kremer;U. Pracht;S. Zapf;J. Pokorný;G. Untereiner;S. Kamba;M.Dressel
We have measured low-temperature terahertz and infrared spectra of La1–xCaxMnO3withx= 0.5; 0.6; 2/3, 0.7; 3/4, 0.85; 0.9; 0.95; 0.98 andx= 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 La1/3Ca2/3MnO3ceramics. In antiferromagnetic phase, for the 0.5 ≤x< 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< 1 (canted antiferromagnetic phase), the electrons behave as Drude-like carriers in the whole temperature interval 5–300 K.
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DOI:
10.1209/0295-5075/90/17005
发表时间:
2009
期刊:
EPL (Europhysics Letters)
影响因子:
--
作者:
E. Zhukova;B. Gorshunov;T. Zhang;D. Wu;A. Prokhorov;V. Torgashev;E. Maksimov;M. Dressel
通讯作者:
M. Dressel
影响因子:
1.3
作者:
B. Gorshunov;E. Zhukova;E. Maksimov;A. S. Prokhorov;V. Torgashev;T. Zhang;D. Wu;M. Dressel
通讯作者:
M. Dressel
影响因子:
2.7
作者:
B. Fisher;J. Genossar;L. Patlagan;G. M. Reisner
通讯作者:
G. M. Reisner
影响因子:
3.7
作者:
T. Zhang;E. Zhukova;B. Gorshunov;D. Wu;A. Prokhorov;V. Torgashev;E. Maksimov;M. Dressel
通讯作者:
M. Dressel
影响因子:
1.8
作者:
A. Nucara;P. Maselli;P. Calvani;R. Sopracase;M. Ortolani;G. Gruener;M. Cestelli Guidi;U. Schade;J. García
通讯作者:
J. García