Anomalous Lattice Softening at X=0.19 and 0.82 in La_<1-X>Ca_XMnO_3 : Condensed Matter: Structure, etc.
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概要
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The longitudinal sound velocity v_s(T) has been measured for La_<1-x>Ca_xMnO_3 crystals, and anomalous softenings of v_s(T) have been observed at the peculiar Ca concentrations of X = 0.19 and X = 0.82. For the X = 0.19 sample, in which the ferromagnetic (FM) metallic phase competes with the FM insulating phase with a polaron ordering, the anomalous v_s(T) softening occurs immediately below the FM transition temperature T_c. For the X = 0.82 sample, in which the charge-ordered (CO) phase competes with the canted antiferromagnetic (CAF) phase, the deep local minimum of v_s(T) occurs around the CO transition temperature T_<CO>. These anomalous v_s(T) softenings result from the giant lattice fluctuations which originate from phase competitions and suggest strong charge-lattice and spin-lattice coupling in this system.
- 社団法人日本物理学会の論文
- 2001-03-15
著者
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Fujimori H
Tohoku Univ. Sendai
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Fukase Tetsuo
Institute For Materials Research Tohoku University
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Fukase Tetsuro
Institute For Materials Research Tohoku University
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FUJISHIRO Hiroyuki
Faculty of Engineering, Iwate University
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IKEBE Manabu
Faculty of Engineering, Iwate University
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Funase Tetsuo
Institute For Material Research Tohoku University
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Fukase T
Institute For Materials Research Tohoku University
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Fukase Tetsuo
Institute For Material Research Tohoku University
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Fujishiro H
Faculty Of Engineering Iwate University
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Ikebe M
Faculty Of Engineering Iwate University
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Ikebe Manabu
Faculty Of Engineering Iwate University
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Fujimori H
Res. Inst. Electric And Magnetic Materials Sendai Jpn
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Fujishiro Hiroyuki
Faculty Of Engineering Iwate University
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Fukase Tetsuo
Institute for Materials Research, Tohoku University
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