1D quantum transport in the even-chain spin-ladder compound $\rm Sr_{2.5}Ca_{11.5}Cu_{24}O_{41}$ and $\rm YBa_2Cu_4O_8$

V. V. Moshchalkov; L. Trappeniers; J. Vanacken

doi:doi:10.1209/epl/i1999-00565-4

DOI: 10.1209/epl/i1999-00565-4

Europhys. Lett, 46 (1), pp. 75-81 (1999)

1D quantum transport in the even-chain spin-ladder compound $\rm Sr_{2.5}Ca_{11.5}Cu_{24}O_{41}$ and $\rm YBa_2Cu_4O_8$

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.).

Abstract:

$\!\!$ The temperature dependence of the resistivity $\rho(\kern-1ptT\kern-1pt)$ of the novel $\kern-1pt\rm Sr_{2.5}Ca_{11.5}Cu_{24}O_{41}$ 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 $\rho(T)$ data obtained at different pressures. The $\rho(T)$ dependence of the underdoped cuprate $\rm YBa_2Cu_4O_8$ demonstrates a remarkable scaling with the $\rho(T)$ of the 1D-SL compound $\rm Sr_{2.5}Ca_{11.5}Cu_{24}O_{41}$ .This scaling implies that underdoped cuprates at $T_{\rm c} < T < T^*$ 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.

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1D quantum transport in the even-chain spin-ladder compound and

Abstract:

1D quantum transport in the even-chain spin-ladder compound $\rm Sr_{2.5}Ca_{11.5}Cu_{24}O_{41}$ and $\rm YBa_2Cu_4O_8$