SPICE Workshop on Hybrid Correlated States and Dynamics in Quantum Materials, May 14th - 16th 2024
Lina Johnsen Kamra
Due to the lack of a net magnetization both at the interface and in the bulk, antiferromagnets with compensated interfaces may appear incapable of influencing the properties of an adjacent superconductor via the spin degree of freedom. Contrary to this assertion, it was theoretically demonstrated that the superconducting transition temperature of an antiferromanget-superconductor hybrid can be controlled via coupling to a ferromagnet through rotation of the magnetization [1]. This behavior is enabled due to the creation of Néel triplet Cooper pairs with a sign that oscillates from one lattice site to the next and a magnitude that varies on the coherence length scale [2]. These Néel triplets can mediate an exchange-like coupling between two antiferromagnets and display distinct signatures in the behavior of the superconducting transition temperature in various hybrid structures [3,4].
[1] L. G. Johnsen, S. H. Jacobsen, and J. Linder, Phys. Rev. B 103, L060505 (2021).[2] G. A. Bobkov, I. V. Bobkova, A. M. Bobkov, and A. Kamra, Phys. Rev. B 106, 144512 (2022).
[3] S. Chourasia, L. J. Kamra, I. V. Bobkova, and A. Kamra, Phys. Rev. B 108, 064515 (2023).
[4] L. J. Kamra, S. Chourasia, G. A. Bobkov, V. M. Gordeeva, I. V. Bobkova, and A. Kamra, Phys. Rev. B 108, 144506 (2023).