Magnetic heat conductivity in $\rm\bf CaCu_2O_3$: linear temperature dependence

Details Magnetic heat conductivity in $\rm\bf CaCu_2O_3$: linear temperature dependence Magnetic heat conductivity in $\rm\bf CaCu_2O_3$: linear temperature dependence

2006-12-12

arxiv.org/abs/cond-mat/0612298v1

Phys. Rev. Lett. 98, 027201 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

appears in PRL

Scientific paper

10.1103/PhysRevLett.98.027201

We present experimental results for the thermal conductivity $\kappa$ of the pseudo 2-leg ladder material $\rm CaCu_2O_3$. The strong buckling of the ladder rungs renders this material a good approximation to a $S=1/2$ Heisenberg-chain. Despite a strong suppression of the thermal conductivity of this material in all crystal directions due to inherent disorder, we find a dominant magnetic contribution $\kappa_\mathrm{mag}$ along the chain direction. $\kappa_\mathrm{mag}$ is \textit{linear} in temperature, resembling the low-temperature limit of the thermal Drude weight $D_\mathrm{th}$ of the $S=1/2$ Heisenberg chain. The comparison of $\kappa_\mathrm{mag}$ and $D_\mathrm{th}$ yields a magnetic mean free path of $l_\mathrm{mag}\approx 22 \pm 5$ \AA, in good agreement with magnetic measurements.

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