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Structural, transport, magnetic properties and Raman spectroscopy of orthorhombic Y$1-x$CaxMnO3(0 <= x <= 0.5) | | M. N. Iliev
; B. Lorenz
; A. P. Litvinchuk
; Y.-Q. Wang
; Y. Y. Sun
; C. W. Chu
; | | Date: |
16 Aug 2004 | | Subject: | Materials Science; Strongly Correlated Electrons | cond-mat.mtrl-sci cond-mat.str-el | | Abstract: | Orthorhombic Y$_{1-x}$Ca$_x$MnO$_3$ ($0 leq x leq 0.5$) was prepared under high pressure and the variations with $x$ of its structural, magnetic, electrical properties and the polarized Raman spectra were investigated. The lattice parameters change systematically with $x$. Although there are strong indications for increasing disorder above $x = 0.20$, the average structure remains orthorhombic in the whole substitutional range. Ca doping increases conductivity, but temperature dependence of resistivity $
ho$(T) remains semiconducting for all $x$. The average magnetic exchange interaction changes from antiferromagnetic for $x < 0.08$ to ferromagnetic for $x > 0.08$. The evolution with $x$ of the Raman spectra provides evidence for increasingly disordered oxygen sublattice at $x geq 0.10$, presumably due to quasistatic and/or dynamical Jahn-Teller distortions. | | Source: | arXiv, cond-mat/0408360 | | Services: | Forum | Review | PDF | Favorites | |
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