Solitary Magnetic Excitations in the Low-Carrier Density, One-DimensionalS=12AntiferromagnetYb

Abstract

We report low-temperature measurements of the specific heat, thermal expansion, and thermal conductivity on the quasi-one-dimensional, effective S 1 2 Heisenberg antiferromagnet Yb 4 As 3 . Distinct field-induced anomalies were found in the above quantities which are well described by the classical sine-Gordon soliton solution for an easy-plane Heisenberg antiferromagnet. Our findings strongly suggest that Yb 4 As 3 represents the first example of an antiferromagnetic S 1 2 spin-chain system where this type of nonlinear excitation could be identified. [S0031-9007 (99)09295-9] PACS numbers: 75.30.Mb, 05.45.Yv, 65.50. + m, 65.70. + y

Heat transport by lattice and spin excitations in the spin-chain compoundsSrCuO2andSr2Sologubenko1, Giannò2, Ott3 et al. 2001Phys. Rev. B212242555View full textAdd to dashboardCite

“…21 The most pronounced effects, however, have been observed in (Sr,Ca) 14 Cu 24 O 41 , containing double-leg Cu-O ladders with 180 • Cu-O-Cu bond angles. 22,23 The thermal conductivity along the ladder direction exhibits an anomalous double-peak temperature dependence.…”

Magnon and Soliton Excitations in the Carrier-Poor, One-Dimensional S=1/2 Antiferromagnet Yb4As3

“…To this purpose, we discuss in the following sections results of the specific-heat, thermal expansion, and thermal conductivity. While the former results are new, the latter ones have already been published in [10]. We shall compare our data with those reported for Cu benzoate [1] and put them into perspective in the concluding section.…”

“…Following [10], we consider the temperature range Τ < ES (B)/kB , Ε(Β) being the soliton-rest energy. For these temperatures, the soliton density per site, ns (T), is sufficiently low.…”

Thermodynamics, geometrical frustration and quantum fluctuations in coupled spin chains

“…In this latter case the weak ferromagnetic interchain interaction leads to the long-range antiferromagnetic order [5]. In some other quasi-1D systems -for example Yb 4 As 3 [6] or UX 3 (X = S,Se,Te) [7,8] the existence of a low temperature long-range order is still an open question. So it seems to be important to have a method which allows one to control the effect of the week interchain interaction on the thermodynamic behaviour of the anisotropic quasi-one-dimensional spin systems.…”