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		<doi>10.1103/PhysRevB.78.134423</doi>
		<issn>1098-0121</issn>
		<label>lattes: 0875527722518904 3 DíazGrAbRaChHe:2008:MaReXr</label>
		<citationkey>DíazGrAbRaChHe:2008:MaReXr</citationkey>
		<title>Magnetic resonant x-ray diffraction study of europium telluride</title>
		<project>CNPq (142292/2004-4); FAPESP (2005/05194-1).</project>
		<year>2008</year>
		<typeofwork>journal article</typeofwork>
		<secondarytype>PRE PI</secondarytype>
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		<author>Díaz, B.,</author>
		<author>Granado, E.,</author>
		<author>Abramof, Eduardo,</author>
		<author>Rappl, Paulo Henrique de Oliveira,</author>
		<author>Chitta, V. A.,</author>
		<author>Henriques, A. B.,</author>
		<group></group>
		<group></group>
		<group>LAS-CTE-INPE-MCT-BR</group>
		<group>LAS-CTE-INPE-MCT-BR</group>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto de Física “Gleb Wataghin”, UNICAMP</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto de Física, Universidade de São Paulo</affiliation>
		<affiliation>Instituto de Física, Universidade de São Paulo</affiliation>
		<electronicmailaddress>bdiazmoreno@gmail.com</electronicmailaddress>
		<electronicmailaddress></electronicmailaddress>
		<electronicmailaddress>abramof@las.inpe.br</electronicmailaddress>
		<electronicmailaddress>rappl@las.inpe.br</electronicmailaddress>
		<e-mailaddress>abramof@las.inpe.br</e-mailaddress>
		<journal>Physical Review B</journal>
		<volume>78</volume>
		<number>134423</number>
		<pages>1-6</pages>
		<transferableflag>1</transferableflag>
		<contenttype>External Contribution</contenttype>
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		<keywords>difração magnética de raios x ressonante, ordenamento magnético, telureto de európio.</keywords>
		<abstract>Here we use magnetic resonant x-ray diffraction to study the magnetic order in a 1.5 m EuTe film grown on (111) BaF_2 by molecular-beam epitaxy. At Eu LII and LIII absorption edges, a resonant enhancement of more than two orders was observed for the sigma &#8594;pi' diffracted intensity at half-order reciprocal-lattice points, consistent with the magnetic character of the scattering. We studied the evolution of the (1/2 1/2 1/2)  magnetic reflection with temperature. When heating toward the Neel temperature (T_N), the integrated intensity decreased monotonously and showed no hysteresis upon cooling again, indicating a second-order phase transition. A power-law fit to the magnetization versus temperature curve yielded T_N=9.99(1) K and a critical exponent beta=0.36(1), which agrees with the renormalization theory results for three-dimensional Heisenberg magnets. The fits to the sublattice magnetization dependence with temperature, disregarding and considering fourth-order exchange interactions, evidenced the importance of the latter for a correct description of magnetism in EuTe. A value of 0.009 was found for the (2j_1+ j_2)/J_2 ratio between the Heisenberg J_2 and fourth-order j_1,2 exchange constants. The magnetization curve exhibited a round-shaped region just near T_N accompanied by an increase in the magnetic peak width, which was attributed to critical scattering above T_N. The comparison of the intensity ratio between the (1/2 1/2 1/2) and the (1 1/2 1 1/2 1 1/2)  magnetic reflections proved that the Eu^2+ spins align within the (111) planes, and the azimuthal dependence of the  (1/2 1/2 1/2)  magnetic peak is consistent with the model of equally populated S domains.</abstract>
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		<language>en</language>
		<targetfile>PhysRevB.78.134423.pdf</targetfile>
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