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- W2142876965 abstract "Two magnetic phase transitions at ${T}_{N1}ensuremath{approx}475mathrm{K}$ (AF1 phase) and ${T}_{N2}ensuremath{approx}240mathrm{K}$ (AF2) are observed in ${mathrm{YBaCuFeO}}_{5}.$ The magnetic unit cell of AF1 is four times the chemical cell, ${a}_{m}=sqrt{2}a,{c}_{m}=2c,$ and the magnetic moments within one chemical cell are antiparallel to each other. The magnetic unit cell of the low-temperature phase AF2 is similar to that of AF1 with ${a}_{M}{=a}_{m},$ but with a four times larger ${c}_{M}$ axis, i.e., ${c}_{M}{=4c}_{m}=8c$ and a more complicated sequence along [001] than in AF1. Denoting the magnetic unit cell of AF1 as A, the magnetic unit cell of AF2 can be considered as built up from the sequence $AAensuremath{-}Aensuremath{-}A$ along [001]. In the Ca-doped compound, oxygen vacancies have a detrimental effect on the long-range correlation along [001]. As a consequence, two magnetic phases coexist: One phase with magnetic unit cell ${a}_{1}=sqrt{2}a$ and ${c}_{1}=c$ appears at room temperature, and the N'eel temperature, ${T}_{N1},$ for the other, predominant phase decreases as compared to the undoped compound. The transition to AF2 seems to be hindered, and AF1 is observed down to 8 K in ${(mathrm{Y}}_{0.94}{mathrm{Ca}}_{0.06}{)mathrm{B}mathrm{a}mathrm{C}mathrm{u}mathrm{F}mathrm{e}mathrm{O}}_{4.95}.$" @default.
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- W2142876965 date "1998-09-01" @default.
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- W2142876965 title "Low-temperature magnetic structure of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>YBaCuFeO</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and the effect of partial substitution of yttrium by calcium" @default.
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- W2142876965 doi "https://doi.org/10.1103/physrevb.58.6291" @default.
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