Two types of superconducting pairs in stripe-ordered La$_{2-x}$Ba$_{x}$CuO$_4$ ($x=1/8$): evidence from the resistivity measurements

Tianhao Ren; Pedro M. Lozano; Qiang Li; Genda Gu; Alexei M. Tsvelik

doi:10.1103/PhysRevB.107.085118

paper

Two types of superconducting pairs in stripe-ordered La $_{2 - x}$ Ba $_{x}$ CuO $_{4}$ ( $x = 1/8$ ): evidence from the resistivity measurements

arXiv:2206.13584 · doi:10.1103/PhysRevB.107.085118

Abstract

Recent angle-resolved $c$ -axis resistivity measurements of the stripe-ordered La $_{2 - x}$ Ba $_{x}$ CuO $_{4}$ (LBCO) with $x = 1/8$ revealed an unexpected dependence on the direction of the in-plane magnetic field. We argue that these and other available data for the $c$ -axis transport point to the existence of superconducting pairs of two different types in the $x = 1/8$ LBCO below the stripe ordering temperature. The pairs of one type carry finite momentum and are confined to the Cu-O planes; the pairs of other type (probably the conventional $d$ -wave with zero momentum) propagate along narrow conducting channels traversing the sample in the $c$ -axis direction. The evidence for this comes from the observed exponential temperature dependence of the $c$ -axis resistivity $ρ_{c} (T)$ which we attribute to the thermally excited slips of the superconducting phase and flux flows. We present a simple theory to fit the observed $π /2$ -periodic dependence of $ρ_{c}$ on the direction of the in-plane magnetic field and the other data.

13 pages, 12 figures

Two types of superconducting pairs in stripe-ordered La2−x​Bax​CuO4​ (x=1/8): evidence from the resistivity measurements

Abstract

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Two types of superconducting pairs in stripe-ordered La $_{2 - x}$ Ba $_{x}$ CuO $_{4}$ ( $x = 1/8$ ): evidence from the resistivity measurements