We show that the spin chain/ladder compound La3Sr3Ca8Cu24O41 is an insulator with hopping transport along the chains. In the temperature range 35–280 K, dc conductivity σdc(T) follows Mott’s law of variable-range hopping conduction; the frequency dependence has the form σ(ν, T) = σdc(T) + A(T)νs, where s ≈ 1. The conduction mechanism changes from variable-range hopping to nearest-neighbor hopping around Tc = 300 K. The chain array thus behaves as a one-dimensional disordered system. Disorder is due to random structural distortions of chains induced by irregular coordination of the La/Sr/Ca ions.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - May 29 2003|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics