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Narrowly avoided spin-nematic phase in BaCdVO(PO4)2: NMR evidence

Ranjith, K. M.; Povarov, K.; Yan, Z.; Zheludev, A.; Horvatic, M.


We present a 31P NMR investigation of BaCdVO(PO4)2 focusing on the nearly saturated regime between μ0Hc1 = 4.05 T and μ0Hc2 = 6.5 T, which used to be considered a promising candidate for a spin-nematic phase. NMR spectra establish the absence of any dipolar order there, whereas the weak field dependence of the magnetization above Hc1 is accounted for by Dzyaloshinskii-Moriya interaction terms. The low-energy spin dynamics (fluctuations), measured by the nuclear spin-lattice relaxation rate T1 −1, confirms the continuity of this phase and the absence of any low-temperature phase transition. Unexpectedly, the spin dynamics above Hc1 is largely dominated by two-magnon processes, which is expected above the saturation field of a spin-nematic phase, but not inside. This shows that BaCdVO(PO4)2 is indeed close to a spin-nematic instability; however, this phase is not stabilized. We thus confirm recent theoretical predictions that the spin-nematic phase can be stabilized, at most, in an extremely narrow field range close to saturation or is rather narrowly avoided [Jiang et al., Phys. Rev. Lett. 130, 116701 (2023)].

Involved research facilities

  • High Magnetic Field Laboratory (HLD)


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