Approaching the bond-nematic quantum critical region in 2D square lattice magnets
We have discovered a new class of J1-J2 system with ferromagnetic J1 and antiferromagnetic J2. We have generalized the theoretical J1-J2 model to include ferromagnetic interactions where new spin-liquid and bond-nematic phases are predicted. Our previous polarized neutron studies of Pb2VO(PO4)2 and SrZnVO(PO4)2 on D7 showed that this is an experimental realization of this system. We are able to tune J1 and J2 by cationic substitution, and we believe that BaCdVO(PO4)2 is close to the new bond-nematic phase. We therefore propose to investigate the spin correlations in the paramagnetic phase for BaCdVO(PO4)2 using XYZ polarization analysis on D7. In conjunction with the thermodynamic measurements already performed, this will allow us to determine J1 and J2 unambiguously. Furthermore, we propose to look at the nature of the quantum fluctuations in the spin diluted system BaCdV0.95Ti0.05O(PO4)2.
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SKOULATOS MARKOS; GOFF Jonathan P.; NILSEN Goran and RUEEGG Christian. (2012). Approaching the bond-nematic quantum critical region in 2D square lattice magnets. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-53-228
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