Coexistence Of Magnetic Order And Persistent Spin Dynamics In A Quantum Kagome Antiferromagnet With No Intersite Mixing
PHYSICAL REVIEW B(2019)
Abstract
One of the key questions concerning frustrated lattices that has lately emerged is the role of disorder in inducing spin-liquid-like properties. In this context, the quantum kagome antiferromagnet YCu3(OH)(6)Cl-3, which has been recently reported as the first geometrically perfect realization of the kagome lattice with negligible magnetic/nonmagnetic intersite mixing and a possible quantum-spin-liquid ground state, is of particular interest. However, contrary to previous conjectures, here we show clear evidence of bulk magnetic ordering in this compound below T-N = 15 K by combining bulk magnetization and heat capacity measurements, and local-probe muon spin relaxation measurements. The magnetic ordering in this material is rather unconventional in several respects. First, a crossover regime where the ordered state coexists with the paramagnetic state extends down to T-N/3 and, second, the fluctuation crossover is shifted far below T-N. Moreover, persistent spin dynamics that is observed at temperatures as low as T/T-N = 1/300 could be a sign of emergent excitations of correlated spin loops or, alternatively, a sign of fragmentation of each magnetic moment into an ordered and a fluctuating part.
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Key words
Quantum Spin Liquids
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