Local evidence for collective spin excitations in the distorted kagome antiferromagnet Pr${}_3$BWO${}_9$

Abstract

We report the local probe investigation of a frustrated antiferromagnet Pr${}_3$BWO${}_9$ with the distorted kagome lattice. Absence of magnetic order or spin freezing is indicated by the spectral analysis down to 0.3 K and specific heat measurements down to 0.09 K. The Knight shifts show an upturn behavior with the sample cooling down, which is further suppressed by external field. For the spin dynamics, gapped spin excitation is observed from the temperature dependence of spin-lattice relaxation rates, with the gap size proportional to the applied magnetic field intensity. Comparatively, an unexpected sharp peak is observed in the nuclear spin-spin relaxation rate data at $T^{\ast }\sim 4-5$ K. These results indicate an unconventional persistent fluctuating paramagnetic ground state with antiferromagnetic collective spin excitations in the strongly frustrated spin system.

6 pages, 4 figures

References in corpus (4)

• Local Spin Susceptibility of the S=1/2 Kagome Lattice in ZnCu3(OD)6Cl2
• Easy-Axis Kagomé Antiferromagnet: Local-Probe Study of Nd${}_3$Ga${}_5$SiO${}_{14}$
• Paramagnetic ground state with field-induced partial order in Nd_3Ga_5SiO_{14} probed by low-temperature heat transport
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Cited by in corpus (9)

• Magnetic phase diagram of the breathing-kagome antiferromagnet Nd${}_3$BWO${}_9$
• Excitation Spectrum and Spin Hamiltonian of the Frustrated Quantum Ising Magnet Pr${}_3$BWO${}_9$
• Incommensurate magnetic order in Sm${}_3$BWO${}_9$ with the distorted kagome lattice
• Antiferromagnetic ordering and critical behavior induced giant magnetocaloric effect in distorted kagome lattice Gd${}_3$BWO${}_9$
• Braided Ising spin-tube physics in a purported kagome magnet
• Magnetic properties and field-induced phenomena in the Jeff = 1/2 distorted kagome antiferromagnet
• High-field NMR study of the spin correlations in the spin-cluster mineral Na${}_2$Cu${}_3$O(SO${}_4$)${}_3$
• Ising Supercriticality and Universal Magnetocalorics in Spiral Antiferromagnet Nd${}_3$BWO${}_9$
• Magnetic and thermodynamic studies on the distorted kagome magnet Pr${}_3$BWO${}_9$