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dc.contributor.authorChen, Y.
dc.contributor.authorStone, M. B.
dc.contributor.authorKenzelmann, M.
dc.contributor.authorBatista, C. D.
dc.contributor.authorReich, D.H.
dc.contributor.authorBroholm, C.
dc.date.accessioned2010-01-06T15:44:44Z
dc.date.available2010-01-06T15:44:44Z
dc.date.issued2007-06-01
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics) 1 June 2007, vol.75, no.21, pp. 214409/1-11en_US
dc.identifier.urihttp://jhir.library.jhu.edu/handle/1774.2/33747
dc.description.abstractField-dependent specific heat and neutron scattering measurements were used to explore the antiferromagnetic S=½ chain compound CuCl2·2((CD3)2SO). At zero field the system acquires magnetic long-range order below TN=0.93 K with an ordered moment of 0.44μB. An external field along the b axis strengthens the zero-field magnetic order, while fields along the a and c axes lead to a collapse of the exchange stabilized order at μ0Hc=6 T and μ0Hc=4 T (extrapolated to zero temperature) and the formation of an energy gap in the excitation spectrum. We relate the field-induced gap to the presence of a staggered g-tensor and Dzyaloshinskii-Moriya interactions, which lead to effective staggered fields for magnetic fields applied along the a and c axes. Competition between anisotropy, interchain interactions, and staggered fields leads to a succession of three phases as a function of field applied along the c axis. For fields greater than μ0Hc, we find a magnetic structure that reflects the symmetry of the staggered fields. The critical exponent, β, of the temperature driven phase transitions are indistinguishable from those of the three-dimensional Heisenberg magnet, while measurements for transitions driven by quantum fluctuations produce larger values of β.en_US
dc.language.isoen_USen_US
dc.publisherAmerican Physical Societyen_US
dc.subjectzero-field magnetic orderen_US
dc.subjectexchange stabilized order collapseen_US
dc.subjectmagnetic long-range orderen_US
dc.subjectneutron scatteringen_US
dc.subjectweakly-coupled anisotropic chainen_US
dc.subjectDzyaloshinskii-Moriya interactionen_US
dc.subjectinterchain interactionsen_US
dc.subjectphase transitionen_US
dc.subjectspin Hamiltoniansen_US
dc.subjectspecific heaten_US
dc.subjectmagnetic momentsen_US
dc.subjectmagnetic anisotropyen_US
dc.subjectlong-range orderen_US
dc.subjectHeisenberg modelen_US
dc.subjectstaggered field symmetryen_US
dc.subjectexchange interactions (electron)en_US
dc.subjectenergy gapen_US
dc.subjectcritical exponentsen_US
dc.subjectcopper compoundsen_US
dc.subjectantiferromagnetic materialsen_US
dc.subjectthree-dimensional Heisenberg magneten_US
dc.subjectCuCl2((CH3)2SO)en_US
dc.titlePhase diagram and spin Hamiltonian of weakly-coupled anisotropic S=½ chains in CuCl2·2((CD3)2SO)en_US
dc.typeArticleen_US


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