Inelastic neutron scattering studies on the odd-membered antiferromagnetic wheel Cr _8Ni

Baker M.L.; Waldmann O.; Piligkos S.Bircher R.Cador O.Carretta S.Collison D.Fernandez-Alonso F.McInnes E.J.L.Mutka H.Podlesnyak A.Tuna F.Ochsenbein S.Sessoli R.Sieber A.Timco G.A.Weihe H.Güdel H.U.Winpenny R.E.P.

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Inelastic neutron scattering studies on the odd-membered antiferromagnetic wheel Cr _8Ni

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~(iC _3H _7)2NH _2Cr _8NiF _9(O _2CCMe)18, or Cr _8Ni, is a prominent example of an odd-membered antiferromagnetic "wheel." A detailed characterization of the magnetic properties of Cr _8Ni has been conducted. Inelastic neutron scattering (INS) is used to investigate the energy and momentum transfer dependence of the low-lying spin excitations, including excited states inaccessible by other experimental techniques. The richness of the INS data, in conjunction with microscopic spin Hamiltonian simulations, enables an accurate characterization of the magnetic properties of Cr _8Ni. Nearest-neighbor exchange constants of J _(CrCr) = 1.31 meV and J _(CrNi) = 3.22 meV are determined, and clear evidence of axial single-ion anisotropy is found. The parameters determined by INS are shown to fit magnetic susceptibility. The spectroscopic identification of several successive S=1 excited total spin states and lowest spin band excitations show that the rotational band picture, valid for bipartite AFM wheels, breaks down for this odd-numbered wheel. The exchange constants determined here differ from previous efforts based on bulk measurements, and possible reasons are discussed. The large J _(CrNi)/J _(CrCr) ratio in Cr _8Ni puts this wheel into a regime with strong quantum fluctuations in which the ground state can be described with a valence bond solid state picture.

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《Physical review, B. Condensed matter and materials physics》 |2012年第6期|064405-1-064405-11|共11页
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Baker M.L.; Waldmann O.; Piligkos S.Bircher R.Cador O.Carretta S.Collison D.Fernandez-Alonso F.McInnes E.J.L.Mutka H.Podlesnyak A.Tuna F.Ochsenbein S.Sessoli R.Sieber A.Timco G.A.Weihe H.Güdel H.U.Winpenny R.E.P.;
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Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, France;

Physikalisches Institut, Universit?t Freiburg, D-79104 Freiburg, Germany;

Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, DenmarkDepartment of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3000 Bern 9, SwitzerlandLaboratorio di Magnetismo Molecolare, Dipartimento di Chimica and INSTM, Universitá Degli Studi di Firenze, 50019 Sesto Fiorentino, ItalyDipartimento di Fisica, Universitá di Parma, CNISM, I-43124 Parma, ItalySchool of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United KingdomISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United KingdomQuantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States;

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Inelastic neutron scattering studies on the odd-membered antiferromagnetic wheel Cr _8Ni

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