Abstract
Results of present and previous measurements of the 23Na NMR response, dc- and ac-magnetic susceptibilities and the specific heat of Na 2 V 3 O 7 at low temperatures suggest that this material is close to a quantum critical point (QCP) at μ 0 H = 0 T . The experimental data can be explained by assuming that below 100 K the localized V magnetic moments ( S = 1 2 ) form a collection of dimers, with a broad distribution of singlet–triplet gaps. Most of the dimers adopt a singlet ground state with gaps between 0 and 350 K. A small fraction of them forms triplet ground states with gaps between 0 and 15 K. The degeneracy of the triplet ground states is lifted by a phase transition at an unusually low temperature of 0.086 K. Modest magnetic fields effectively quench this low-temperature state and the system is driven away from the QCP as the applied fields are enhanced to above 1 T.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
