Monoclinic
Li3Co2SbO6 has been
proposed as a Kitaev spin liquid candidate and investigated intensively,
whereas the properties of its polymorph, the orthorhombic phase, are
less known. Here we report the magnetic properties of orthorhombic
Li3Co2SbO6 as revealed by dc and
ac magnetic susceptibility, muon spin relaxation (μSR), and
neutron diffraction measurements. Successive magnetic transitions
at 115, 89, and 71 K were observed in the low-field dc susceptibility
measurements. The transitions below T
N (115 K) are suppressed at higher applied fields. However, zero-field
ac susceptibility measurements reveal distinct frequency-independent
transitions at about 114, 107, 97, 79, and 71 K. A long-range magnetic
ordered state was confirmed by specific heat, μSR, and neutron
diffraction measurements, all indicating a single transition at about
115 K. The discrepancy between different measurements is attributed
to possible stacking faults and/or local disorders of the ferromagnetic
zigzag chains, resulting in ferromagnetic boundaries within the overall
antiferromagnetic matrix.
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