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Type: Artigo de periódico
Title: Magnetic ordering and transitions of EuSe studied by x-ray diffraction
Author: Diaz, B
Granado, E
Abramof, E
Torres, L
Lechner, RT
Springholz, G
Bauer, G
Abstract: The magnetic phase diagram and thermal expansion of EuSe is revisited using a high-quality 3200-angstrom-thick epitaxial film grown over a (111)BaF(2) substrate. Resonant magnetic x-ray diffraction experiments reveal a highly hysteretic magnetic phase diagram between 1.8 and T(N)similar to 4.7 K, in which two antiferromagnetic phases with propagation vectors (k) over right arrow (I)=[(1)/(4), (1)/(4),-(1)/(4)] (represented by up arrow up arrow down arrow down arrow) and (k) over right arrow (II)=[(1)/(2),(1)/(2),-(1)/(2)](up down arrow up down arrow) are observed. In addition, a defective phase with (k) over right arrow (III)=[h, h, -h]((1)/(4)<h<(1)/(3)) competes with the up arrow up arrow down arrow down arrow phase. Details of the temperature dependence of (k) over right arrow (III) and corresponding peak widths indicate this phase is intermediate between up arrow up arrow down arrow down arrow (h=(1)/(4)) and an ideal ferrimagnetic up arrow up arrow down arrow phase (h=(1)/(3)), and may be represented by (n x up arrow up arrow down arrow+down arrow), with mean n values between 7 and 2. High-resolution x-ray diffraction experiments show unit-cell hysteretic distortions that correlate with the transitions to the different magnetic phases existing below T(N).
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.81.184428
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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