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Strong quantum fluctuations in a quantum spin liquid candidate with a Co-based triangular lattice | | Ruidan Zhong
; Shu Guo
; Guangyong Xu
; Zhijun Xu
; Robert J. Cava
; | | Date: |
6 May 2019 | | Abstract: | Currently under active study in condensed matter physics, both theoretically
and experimentally, are quantum spin liquid (QSL) states, in which no
long-range magnetic ordering appears at low temperatures due to strong quantum
fluctuations of the magnetic moments. The existing QSL candidates all have
their intrinsic disadvantages, however, and solid evidence for quantum
fluctuations is scarce. Here we report a new compound,
Na$_{2}$BaCo(PO$_{4}$)$_{2}$, a geometrically frustrated system with effective
spin-1/2 local moments for Co$^{2+}$ ions on an isotropic two-dimensional
triangular lattice. Magnetic susceptibility and neutron scattering experiments
show no magnetic ordering down to 0.05 K. Thermodynamic measurements show that
there is a tremendous amount of magnetic entropy present below 1 K in zero
applied magnetic field. The presence of localized low-energy spin fluctuations
is revealed by inelastic neutron measurements. At low applied fields, these
spin excitations are confined to low energy and contribute to the anomalously
large specific heat. In larger applied fields, the system reverts to normal
behavior as evident by both neutron and thermodynamic results. Our experimental
characterization thus reveals that this new material is an excellent candidate
for the experimental realization of a quantum spin liquid state. | | Source: | arXiv, 1905.2115 | | Services: | Forum | Review | PDF | Favorites | |
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