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    Quantum criticality in an organic magnet

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    Broholm Quantum criticality 2006.pdf (383.3Kb)
    Date
    2006-06-30
    Author
    Stone, M. B.
    Broholm, C.
    Reich, D.H.
    Tchernyshyov, O.
    Vorderwisch, P.
    Harrison, N.
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    Abstract
    Exchange interactions between S=½ sites in piperazinium hexachlorodicuprate produce a frustrated bilayer magnet with a singlet ground state. We have determined the field-temperature phase diagram by high field magnetization and neutron scattering experiments. There are two quantum critical points: Hc1=7.5 T separates a quantum paramagnet phase from a three dimensional, antiferromagnetically ordered state while Hc2=37 T marks the onset of a fully polarized state. The ordered phase, which we describe as a magnon Bose-Einstein condensate (BEC), is embedded in a quantum critical regime with short range correlations. A low temperature anomaly in the BEC phase boundary indicates that additional low energy features of the material become important near Hc1.
    URI
    http://jhir.library.jhu.edu/handle/1774.2/33751
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    • Condensed Matter Physics

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