# Link between magnetism and resistivity upturn in cuprates a thermal conductivity study of La2Sr2-xCuO4

P. Bourgeois-Hope, S. Y. Li, F. Laliberté, S. Badoux, S. M. Hayden, N. Momono, T. Kurosawa, K. Yamada, H. Takagi, Nicolas Doiron-Leyraud, Louis Taillefer

Research output: Contribution to journalArticle (Academic Journal)peer-review

## Abstract

A key unexplained feature of cuprate superconductors is the upturn in their normal state electrical resistivity $\rho(T)$ seen at low temperature inside the pseudogap phase. We examined this issue via measurements of the thermal conductivity $\kappa(T)$ down to 50 mK and in fields up to 17 T on the cuprate La$_{2-x}$Sr$_x$CuO$_4$ at dopings $p = 0.13$, 0.136, 0.143 and 0.18. At $p$ = 0.136, 0.143, and 0.18, we observe an initial increase of the electronic thermal conductivity $\kappa_0/T$ as a function of field, as expected in a $d$-wave superconductor. For $p$ = 0.136 and 0.143, further increasing the field then leads to a decrease of $\kappa_0/T$, which correlates with the onset of spin density-wave order as observed in neutron scattering experiments on the same samples. This decrease of $\kappa_0/T$ with field is imposed by the Wiedemann-Franz law and the high value of the resistivity in the high-field normal state of these samples. Our study therefore provides a direct link between magnetism and the resistivity upturn in the pseudogap phase of cuprates. We discuss this scenario in the broader context of other cuprates.
Original language English Physical Review B 2019 Unpublished - 2019

### Bibliographical note

10 pages, 7 Figures, includes Supplementary Material

## Keywords

• cond-mat.supr-con
• cond-mat.str-el

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