Weakly coupled s=1/2 quantum Spin singlets in Ba3Cr2O8

Kofu, M. and Kim, J.-H. and Ji, S. and Lee, S.-H. and Ueda, H. and Qiu, Y. and Kang, H.-J. and Green, M.A. and Ueda, Y. (2009) Weakly coupled s=1/2 quantum Spin singlets in Ba3Cr2O8. Physical Review Letters, 102 (3). p. 37206. ISSN 00319007 (ISSN). (doi:https://doi.org/10.1103/PhysRevLett.102.037206) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Abstract

Using single crystal inelastic neutron scattering with and without the application of an external magnetic field and powder neutron diffraction, we have characterized magnetic interactions in Ba3Cr2O8. Even without a field, we found that there exist three singlet-to-triplet excitation modes in the (h, h, l) scattering plane. Our complete analysis shows that the three modes are due to spatially anisotropic interdimer interactions that are induced by lattice distortions of the tetrahedron of oxygens surrounding the Jahn-Teller active Cr5+(3d1). The strong intradimer coupling of J0=2.38(2) meV and weak interdimer interactions (|Jinter|0.52(2) meV) makes Ba3Cr2O8 a good model system for weakly coupled s=1/2 quantum spin dimers. © 2009 The American Physical Society.

Item Type: Article
Additional information: Unmapped bibliographic data: C7 - 037206 [EPrints field already has value set] LA - English [Field not mapped to EPrints] J2 - Phys Rev Lett [Field not mapped to EPrints] AD - Department of Physics, University of Virginia, Charlottesville, VA 22904-4714, United States [Field not mapped to EPrints] AD - NIST Center for Neutron Research, Gaithersburg, MD 20899-6100, United States [Field not mapped to EPrints] AD - Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan [Field not mapped to EPrints] AD - Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742-6393, United States [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Magnetic fields, Oligomers, Oxygen, Single crystals, Spin dynamics, External magnetic fields, Inelastic neutrons, Interdimer interactions, Intradimer couplings, Jahn tellers, Lattice distortions, Magnetic interactions, Model systems, Powder neutron diffractions, Quantum spins, Scattering planes, Spin singlets, Triplet excitations, Neutron diffraction
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 14 Oct 2015 16:17 UTC
Last Modified: 14 Oct 2015 16:17 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/51009 (The current URI for this page, for reference purposes)
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