Europhys. Lett, 46 (1), pp. 75-81 (1999)
1D quantum transport in the even-chain spin-ladder compound and
V. V. Moshchalkov, L. Trappeniers and J. Vanacken
Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven Celestijnenlaan 200 D - B-3001 Leuven, Belgium
(received 23 February 1998; accepted in final form 14 January 1999)
PACS. 75.10Jm - Quantized spin models.
PACS. 74.25Fy - Transport properties (electric and thermal conductivity, thermoelectric effects, etc.).
PACS. 74.20Mn - Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.).
The temperature dependence of the resistivity of the novel ladder compound under hydrostatic pressure of up to 8 GPa has been explained by assuming that the relevant length scale for electrical transport is given by the magnetic correlation length related to the opening of a spin-gap in a 1D even-chain spin-ladder (1D-SL). The pressure dependence of the gap was extracted by applying this model to data obtained at different pressures. The dependence of the underdoped cuprate demonstrates a remarkable scaling with the of the 1D-SL compound .This scaling implies that underdoped cuprates at are in the 1D regime and their pseudo-gap below T* is the spin-gap in the even-chain 1D-SL formed at T < T* in these materials.