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Berger, R.
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Publications (11/11 displayed)
- 2020Production and processing of graphene and related materialscitations
- 2020Production and processing of graphene and related materials
- 2020Boriding of HVOF-sprayed Inconel 625 coatingscitations
- 2016Surface forces between colloidal particles at high hydrostatic pressurecitations
- 2011High-performance electron-transporting polymers derived from a heteroaryl bis(trifluoroborate)citations
- 2010Guided phase separation of polymer blend thin films on ion beam-induced pre-patterned substratescitations
- 2009Integrated blocking layers for hybrid organic solar cellscitations
- 2007Oriented nanometer surface morphologies by thermal relaxation of locally cross-linked and streteched polymer samplescitations
- 2006Nanoparticles in oxide glasses: Magnetic resonance studiescitations
- 2006Chemical tuning of the interlayer magnetic coupling in TlCo2Se2-xSxcitations
- 2004Magnetic and electronic structure of TICo2S2citations
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article
Chemical tuning of the interlayer magnetic coupling in TlCo2Se2-xSx
Abstract
The system TlCo2Se2-xSx has been thoroughly investigated by neutron powder diffraction and SQUID magnetometry. TlCo2Se2-xSx is a layered tetragonal structure containing atomic cobalt layers separated by a distance of 6.4 angstrom in the sulphide and 6.8 angstrom in the selenide. The solid solubility of isovalent selenium and sulphur atoms in the structure makes it possible to continuously vary the interlayer distance and thereby tune the magnetic coupling between the Co-layers. At low temperatures, the Co-atoms are ferromagnetically ordered within the layers and magnetic moments lie in the ab-plane. However, these Co-moments form a helical magnetic structure that prevails for 0 <= x <= 1.5 with a gradual decrease of the angle between adjacent Co-layers from 122 degrees to 39 degrees. For x >= 1.75, a collinear ferromagnetic structure is stable. The relationship between the coupling angle and the Co-interlayer separation shows an almost linear behaviour. The helical phase contains no net spontaneous magnetic moment up to TlCo2SeS, where a small net magnetic moment appears that increases until the ferromagnetic structure is found for 1.75 <= x <= 2.0. (C) 2005 Elsevier B.V. All rights reserved.