Low-energy excitations of the semimetallic one-dimensional S=1/2 antiferromagnet Yb4As3

Thermal Conductivity via Magnetic Excitations in Spin-Chain Materials

“…(5) to estimate the values and the temperature dependence of the average mean free path of excitations in the corresponding spin system. In many experimental publications on the spin thermal conductivity in 1D spin chains and ladders, 39,33,49,36,50,53,46,52,40,54,55,56,57 magnetic defects were considered as major scattering centers for spin excitations. It was always assumed that the corresponding scattering rates and hence the mean free paths (l s,def ) were T -and k-independent.…”

Bose glass behavior in(Yb1−xLux)4As3representing randomly diluted quantum spin-Kamieniarz1, Matysiak2, Gegenwart3 et al. 2016Phys. Rev. BSelf Cite

“…However, the spin gap can be also induced by the transverse magnetic field applied in antiferromagnetic spin-1/2 chains with a Dzyaloshinskii-Moriya (DM) interaction [19][20][21]. A good example of such a system is Yb 4 As 3 [22]. Upon dilution of Yb 4 As 3 by the lutetium ions Lu +3 , the magnetic Yb 3+ is substituted by the chemically identical non-magnetic Lu 3+ , and the charge ordering in the sitediluted (Yb 1−x Lu x ) 4 As 3 is retained for x ≤ 0.06 [23].…”

“…Following the consensus that the chains are well isolated and the XXZ anisotropy between the adjacent Yb 3+ ions is canceled by the DM antisymmetric exchange [22,27,28], the physical system is described by the onedimensional effective spin-1/2 model…”

The semimetallic S = 1/2 antiferromagnetic chain Yb4As3: quantum transfer‐matrix simulations and experimental field‐dependent specific‐heat data

“…The Yb-ions occupy the Phosphorus sites at the three-fold symmetry axes, the As-ions are located at the Thorium sites. The Yb-sites can be viewed as being aligned along four families of interpenetrating chains oriented parallel to the space diagonals of a cube, known as body-centered cubic rod packing [2]. At T co % 295 [K] the IV state exhibits a charge-ordering instability such that far below T co one of the four Yb ions becomes trivalent and forms a one-dimensional spin S ¼ 1=2 chain along the ½111 direction [3].…”

“…The neutron scattering experiments on Yb 4 As 3 actually confirmed that the excitation spectrum is well described by the onedimensional S ¼ 1=2 isotropic Heisenberg model [5] in the absence of magnetic field. The interchain interactions are small and ferromagnetic, leading to a low-T spin-glass freezing [2].…”