Incommensurate dynamic correlations in the quasi-two-dimensional spin liquid BiCu2PO6

Abstract

We report detailed inelastic neutron scattering measurements on single crystals of the frustrated two-leg ladder BiCu2PO6, whose ground state is described as a spin liquid phase with no long-range order down to 6 K. Two branches of steeply dispersing long-lived spin excitations are observed with excitation gaps of Δ_1 = 1.90(9) meV and Δ_2 = 3.95(8) meV. Significant frustrating next-nearest neighbour interactions along the ladder leg drive the minimum of each excitation branch to incommensurate wavevectors ζ_1 = 0.574πand ζ_2 = 0.553πfor the lower and upper energy branches respectively. The temperature dependence of the excitation spectrum near the gap energy is consistent with thermal activation into singly and doubly degenerate excited states. The observed magnetic excitation spectrum as well as earlier thermodynamic data could be consistently explained by the presence of strong anisotropic interactions in the ground state Hamiltonian.

7 pages, 4 figures

References in corpus (7)

• One- and Two-Triplon Spectra of a Cuprate Ladder
• Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder
• Field-induced Tomonaga-Luttinger liquid phase of a two-leg spin-1/2 ladder with strong leg interactions
• Bridging frustrated-spin-chain and spin-ladder physics: quasi-one-dimensional magnetism of BiCu2PO6
• Uniform and staggered magnetizations induced by Dzyaloshinskii-Moriya interactions in isolated and coupled spin 1/2 dimers in a magnetic field
• Spin-gap behaviour in the 2-leg spin-ladder BiCu2PO6
• Mesoscopic Phase Coherence in a Quantum Spin Fluid

Cited by in corpus (15)

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• Magnetic transitions in the spin S=5/2 frustrated magnet BiMn2PO6 and strong lattice softening in BiMn2PO6 and BiZn2PO6 below 200 K
• Magnetic ordering induced by interladder coupling in the spin-1/2 Heisenberg two-leg ladder antiferromagnet C${}_9$H${}_{18}$N${}_2$CuBr${}_4$
• Theory of triplon dynamics in the quantum magnet BiCu${}_2$PO${}_6$
• Non-trivial topology of the quasi-one-dimensional triplons in the quantum antiferromagnet ${\text{BiCu}}_2{\text{PO}}_6$
• Magnetic responses of randomly depleted spin ladders
• Minimal model for the frustrated spin ladder system BiCu${}_2$PO${}_6$
• Magnetic excitations in magnetization plateaux of a frustrated spin ladder
• Two Coupled Chains are Simpler than One: Field-induced Chirality in a Frustrated Quantum Spin Ladder
• Low-energy spin excitations in field-induced phases of the spin-ladder antiferromagnet BiCu${}_2$PO${}_6$
• Triplet excitations in the frustrated spin ladder Li${}_2$Cu${}_2$O(SO${}_4$)${}_2$
• Interacting triplons in frustrated spin ladders: Binding and decay in BiCu${}_2$PO${}_6$
• Lifshitz Transition Induced by Magnetic Field in Frustrated Two-Leg Spin-Ladder Systems
• Zigzag spin chains in the spin-5/2 antiferromagnet Ba${}_2$Mn(PO${}_4{)}_2$