Linarite - a quasi-critical J${}_1$-J${}_2$ chain

Abstract

The mineral linarite, PbCuSO${}_4$(OH)${}_2$, is a spin 1/2 chain with frustrating nearest neighbor ferromagnetic and next-nearest neighbor antiferromagnetic exchange interactions. Our inelastic neutron scattering experiments performed above the saturation field establish that the ratio between these exchanges is such that linarite is extremely close to the quantum critical point between spin-multipolar phases and the ferromagnetic state. However, the measured complex magnetic phase diagram depends strongly on the magnetic field direction. The field-dependent phase sequence is explained by our classical simulations of a nearly critical model with tiny orthorhombic exchange anisotropy. The simulations also capture qualitatively the measured variations of the wave vector as well as the staggered and the uniform magnetizations in an applied field.

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Cited by in corpus (13)

• Quantum Magnetism in Minerals
• Magnetic phase diagram of the strongly frustrated quantum spin chain system PbCuSO${}_4$(OH)${}_2$ in tilted magnetic fields
• Multiple phase transitions and high-field quadrupolar order in a model for $\beta$-TeVO${}_4$
• The magnetic phase diagram of the frustrated spin chain compound linarite, PbCuSO${}_4$(OH)${}_2$, as seen by neutron diffraction and ${}^1$H-NMR
• The origin of up-up-down-down magnetic order in Cu${}_2$GeO${}_4$
• Thermal transport of the frustrated spin-chain mineral linarite: Magnetic heat transport and strong spin-phonon scattering
• High-field magnetic structure of the triangular antiferromagnet RbFe(MoO4)2
• Magnetic ground state of the frustrated spin-1/2 chain compound $\beta$-TeVO${}_4$ at high magnetic fields
• Electron spin resonance in spiral antiferromagnet linarite: theory and experiment
• Low-energy spin excitations of the frustrated ferromagnetic $J_1$-$J_2$ chain material linarite, PbCuSO${}_4$(OH)${}_2$, in applied magnetic fields $\mathbf{H}\parallel b$ axis
• Large magnetic thermal conductivity induced by frustration in low-dimensional quantum magnets
• Competing magnetic phases in the frustrated spin-1/2 chain compound $\beta$-TeVO${}_4$ probed by NMR
• High-field magnetic properties of the alternating ferro-antiferromagnetic spin-chain compound Cu${}_2$(OH)${}_3$Br