2002/10/17 by K. Biljakovic, K. Biljaković, M. Miljak +9 · 3 citations
Engineering · Materials Science · Physics and Astronomy · #Force Microscopy Techniques and Applications #Molecular Junctions and Nanostructures #Organic and Molecular Conductors Research #cond-mat
paper · pdf · doi:10.1209/epl/i2003-00386-y
7 pages, 3 figures, submitted to Europhysics Letters
arxiv created 2002/10/17 · openalex publication_date 2003/05/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Measurements of the magnetic susceptibility and its anisotropy in the quasi-one-dimensional system o-TaS3 in its low-T charge density wave (CDW) ground state are reported. Both sets of data reveal below 40 K an extra paramagnetic contribution obeying a power-law temperature dependence χ(T)=AT-0.7. The fact that the extra term measured previously in specific heat in zero field, ascribed to low-energy CDW excitations, also follows a power law CLEE(0,T)=CT0.3, strongly revives the case of random exchange spin chains. Introduced impurities (0.5% Nb) only increase the amplitude C, but do not change essentially the exponent. Within the two-level system (TLS) model, we estimate from the amplitudes A and C that there is one TLS with a spin s=1/2 localized on the chain at the lattice site per cca 900 Ta atoms. We discuss the possibility that it is the charge frozen within a soliton-network below the glass transition Tg~40 K determined recently in this system.