Physical Review B, volume 106, issue 14, publication number 144512
Néel proximity effect at antiferromagnet/superconductor interfaces
4
Condensed Matter Physics Center (IFIMAC) and Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
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Publication type: Journal Article
Publication date: 2022-10-27
Journal:
Physical Review B
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor: 3.7
ISSN: 24699950, 24699969, 10980121, 1550235X
Abstract
Spin splitting induced in a conventional superconductor weakens superconductivity by destroying spin-singlet and creating spin-triplet Cooper pairs. We demonstrate theoretically that such an effect is also caused by an adjacent compensated antiferromagnet, which yields no net spin splitting. We find that the antiferromagnet produces N\'eel triplet Cooper pairs, whose pairing amplitude oscillates rapidly in space similar to the antiferromagnet's spin. The emergence of these unconventional Cooper pairs reduces the singlet pairs' amplitude, thereby lowering the superconducting critical temperature. We develop a quasiclassical Green's functions description of the system employing a two-sublattice framework. It successfully captures the rapid oscillations in the Cooper pairs' amplitude at the lattice spacing scale as well as their smooth variation on the larger coherence length scale. Employing the theoretical framework thus developed, we investigate this N\'eel proximity effect in a superconductor/antiferromagnet bilayer as a function of interfacial exchange, disorder, and chemical potential, finding rich physics. Our findings also offer insights into experiments which have found a larger than expected suppression of superconductivity by an adjacent antiferromagnet.
Citations by journals
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Physical Review B
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Physical Review B
8 publications, 80%
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Physical Review Letters
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Physical Review Letters
1 publication, 10%
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European Physical Journal B
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European Physical Journal B
1 publication, 10%
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Citations by publishers
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American Physical Society (APS)
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American Physical Society (APS)
9 publications, 90%
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Springer Nature
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Springer Nature
1 publication, 10%
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Bobkov G. A. et al. Néel proximity effect at antiferromagnet/superconductor interfaces // Physical Review B. 2022. Vol. 106. No. 14. 144512
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Bobkov G. A., Bobkova I., Bobkov A., Kamra A. Néel proximity effect at antiferromagnet/superconductor interfaces // Physical Review B. 2022. Vol. 106. No. 14. 144512
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TY - JOUR
DO - 10.1103/physrevb.106.144512
UR - https://doi.org/10.1103%2Fphysrevb.106.144512
TI - Néel proximity effect at antiferromagnet/superconductor interfaces
T2 - Physical Review B
AU - Bobkov, G. A.
AU - Bobkova, I. V.
AU - Bobkov, A. M.
AU - Kamra, Akashdeep
PY - 2022
DA - 2022/10/27 00:00:00
PB - American Physical Society (APS)
IS - 14
VL - 106
SN - 2469-9950
SN - 2469-9969
SN - 1098-0121
SN - 1550-235X
ER -
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@article{2022_Bobkov,
author = {G. A. Bobkov and I. V. Bobkova and A. M. Bobkov and Akashdeep Kamra},
title = {Néel proximity effect at antiferromagnet/superconductor interfaces},
journal = {Physical Review B},
year = {2022},
volume = {106},
publisher = {American Physical Society (APS)},
month = {oct},
url = {https://doi.org/10.1103%2Fphysrevb.106.144512},
number = {14},
doi = {10.1103/physrevb.106.144512}
}