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  Complex and strongly anisotropic magnetism in the pure spin system EuRh2Si2

Seiro, S., & Geibel, C. (2014). Complex and strongly anisotropic magnetism in the pure spin system EuRh2Si2. Journal of Physics: Condensed Matter, 26(4): 046002, pp. 1-7. doi:10.1088/0953-8984/26/4/046002.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0017-C25E-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-28F3-F
Genre: Journal Article

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Seiro, Silvia1, Author              
Geibel, Christoph2, Author              
Affiliations:
1Silvia Seiro, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863473              
2Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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 Abstract: In divalent Eu systems, the 4f local moment has a pure spin state J = S = 7/2. Although the absence of orbital moment precludes crystal electric field effects, we report a sizable magnetic anisotropy in single crystals of EuRh2Si2. We observed a surprisingly complex magnetic behavior with three successive phase transitions. The Eu2+ moments order in a probably amplitude-modulated structure below 24.5 K, undergoing a further transition to a structure that is possibly of the equal-moment type, and a first order transition at lower temperatures, presumably into a spin spiral structure. The sharp metamagnetic transition observed at low fields applied perpendicular to the hard axis is consistent with a change from a spiral to a fan structure. These magnetic structures are presumably formed by ferromagnetic planes perpendicular to the c axis, stacked antiferromagnetically along c but not of type I, at least just below the ordering temperature. Since EuRh2Si2 is isoelectronic and isostructural to EuFe2As2 at room temperature, our results are also relevant for the complex Eu-magnetism observed there, especially for the transition from an antiferromagnetic to a ferromagnetic state observed in EuFe2P2 upon substituting As by P.

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 Dates: 2014-01-01
 Publication Status: Published in print
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Title: Journal of Physics: Condensed Matter
Source Genre: Journal
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Publ. Info: Bristol, UK : IOP Pub.
Pages: - Volume / Issue: 26 (4) Sequence Number: 046002 Start / End Page: 1 - 7 Identifier: ISSN: 0953-8984
CoNE: /journals/resource/954928562478