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		<doi>10.1063/1.5143311</doi>
		<issn>0003-6951</issn>
		<citationkey>GratensOuMooRapHen:2020:HySpPo</citationkey>
		<title>Hypergiant spin polarons photogenerated in ferromagnetic europium chalcogenides</title>
		<year>2020</year>
		<month>Apr.</month>
		<typeofwork>journal article</typeofwork>
		<secondarytype>PRE PI</secondarytype>
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		<author>Gratens, Xavier,</author>
		<author>Ou, Yunbo,</author>
		<author>Mooderan, Jagadeesh S.,</author>
		<author>Rappl, Paulo Henrique de Oliveira,</author>
		<author>Henriques, André B.,</author>
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		<group></group>
		<group>LABAS-COCTE-INPE-MCTIC-GOV-BR</group>
		<affiliation>Universidade de São Paulo (USP)</affiliation>
		<affiliation>Massachusetts Institute of Technology</affiliation>
		<affiliation>Massachusetts Institute of Technology</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Universidade de São Paulo (USP)</affiliation>
		<electronicmailaddress>andreh@if.usp.br</electronicmailaddress>
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		<electronicmailaddress></electronicmailaddress>
		<electronicmailaddress>paulo.rappl@inpe.br</electronicmailaddress>
		<journal>Applied Physics Letters</journal>
		<volume>116</volume>
		<number>15</number>
		<pages>e152402</pages>
		<secondarymark>A1_ODONTOLOGIA A1_INTERDISCIPLINAR A1_FARMÁCIA A1_ENGENHARIAS_III A1_CIÊNCIA_DE_ALIMENTOS A1_BIODIVERSIDADE A2_QUÍMICA A2_MEDICINA_II A2_MATERIAIS A2_ENGENHARIAS_IV A2_ENGENHARIAS_II A2_CIÊNCIAS_BIOLÓGICAS_III A2_CIÊNCIAS_BIOLÓGICAS_II A2_BIOTECNOLOGIA A2_ASTRONOMIA_/_FÍSICA B1_MATEMÁTICA_/_PROBABILIDADE_E_ESTATÍSTICA B1_CIÊNCIA_DA_COMPUTAÇÃO B2_ENSINO C_CIÊNCIAS_BIOLÓGICAS_I</secondarymark>
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		<abstract>We find that in the ferromagnetic semiconductor EuS, near its Curie temperature, a single band edge photon generates a spin polaron (SP), whose magnetic moment approaches 20 000 Bohr magnetons. This is much larger than the supergiant photoinduced SPs in antiferromagnetic europium chalcogenides, reported previously. The larger SP in ferromagnetic EuS, and still larger expected for EuO, is explained by a larger Bohr radius of the photoexcited electron state, which encircles and polarizes a greater number of lattice spins. However, because the wave function of the photoexcited electron spreads over a greater volume, the photoexcited electrons exchange interaction with individual lattice spins weakens, which makes the SP more easily quenched thermally.</abstract>
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		<language>en</language>
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