Persistent spin dynamics intrinsic to amplitude-modulated long-range magnetic order

Abstract

An incommensurate elliptical helical magnetic structure in the frustrated coupled-spin-chain system FeTe2O5Br is surprisingly found to persist down to 53(3) mK (T/T_N ~ 1/200), according to neutron scattering and muon spin relaxation. In this state, finite spin fluctuations at T -> 0 are evidenced by muon depolarization, which is in agreement with specific-heat data indicating the presence of both gapless and gapped excitations. We thus show that the amplitude-modulated magnetic order intrinsically accommodates contradictory persistent spin dynamics and long-range order and can serve as a model structure to investigate their coexistence.

5 pages + supplementary

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Cited by in corpus (15)

• Experimental signatures of quantum and topological states in frustrated magnetism
• Coexistence of magnetic order and persistent spin dynamics in a quantum kagome antiferromagnet with no intersite mixing
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• Frustration-induced nanometre-scale inhomogeneity in a triangular antiferromagnet
• Development of short and long-range magnetic order in the double perovskite based frustrated triangular lattice antiferromagnet Ba2MnTeO6
• Controlling Majorana states in topologically inhomogeneous superconductors
• Magnetic order and low-energy excitations in the quasi-one-dimensional antiferromagnet CuSe${}_2$O${}_5$ with staggered fields
• Multiferroicity in the geometrically frustrated FeTe2O5Cl
• Thermodynamics of frustrated ferromagnetic spin-$1/2$ Heisenberg chains: The role of inter-chain coupling
• Exchange anisotropy as mechanism for spin-stripe formation in frustrated spin chains
• Elementary excitation in the spin-stripe phase in quantum chains
• Evolution of magnetic and crystal structures in the multiferroic FeTe2O5Br
• Muon spin rotation and relaxation in Pr${}_{1-x}$Nd${}_x$Os${}_4$Sb${}_{12}$: Magnetic and superconducting ground states
• Crystal field effects in the zig-zag chain compound SrTm${}_2$O${}_4$
• Coexistence of static and dynamic local magnetic fields in an S = 3/2 honeycomb lattice antiferromagnet Co2Te3O8