Localized high-energy excitations in the Cu2GaBO5 ludwigite
The frustrated low-dimensional quantum magnet Cu2GaBO5 with the ludwigite crystal structure features strong site disorder on the magnetic Cu2+ sublattice. Nevertheless, in zero magnetic field it exhibits a sharp magnetic transition at T_N=4 K into a complex long-range-ordered noncollinear antiferromagnetic (AFM) state with a propagation vector q_m=(0.45 0 & -0.7), according to our single-crystal neutron diffraction measurements. External magnetic field broadens the transition and drastically reduces the magnetic correlation length, leading to a field-induced magnetically disordered (spin-glass-like) state. On the one hand, our recent cold-neutron INS measurements at PANDA (MLZ, Garching) revealed quasielastic diffuse scattering in the vicinity of the magnetic ordering vector with typical energy scales of < 1 meV. On the other hand, first-principles calculations predict strong antiferromagnetic coupling within dimer and trimer units on much higher energy scales of the order of 10 meV, implying that most of the INS spectral weight should be contained in quasi-localized triplon-like excitations at higher energies.
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KULBAKOV Anton; Dmytro Inosov; IVANOV Alexandre; JANSON Oleg and MANNATHANATH CHAKKINGAL Aswathi. (2021). Localized high-energy excitations in the Cu2GaBO5 ludwigite. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1709
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