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Strain-engineering Mott-insulating $La_2CuO_4$

Authors :
Ivashko, O; https://orcid.org/0000-0002-4869-8175
Horio, M; https://orcid.org/0000-0003-2669-5368
Wan, W
Christensen, N B
McNally, D E
Paris, E
Tseng, Y
Shaik, N E
Rønnow, H M; https://orcid.org/0000-0002-8832-8865
Wei, H I; https://orcid.org/0000-0002-8946-755X
Adamo, C
Lichtensteiger, C
Gibert, M; https://orcid.org/0000-0001-8856-6831
Beasley, M R
Shen, K M
Tomczak, J M; https://orcid.org/0000-0003-1581-8799
Schmitt, T
Chang, J; https://orcid.org/0000-0002-4655-1516
Ivashko, O; https://orcid.org/0000-0002-4869-8175
Horio, M; https://orcid.org/0000-0003-2669-5368
Wan, W
Christensen, N B
McNally, D E
Paris, E
Tseng, Y
Shaik, N E
Rønnow, H M; https://orcid.org/0000-0002-8832-8865
Wei, H I; https://orcid.org/0000-0002-8946-755X
Adamo, C
Lichtensteiger, C
Gibert, M; https://orcid.org/0000-0001-8856-6831
Beasley, M R
Shen, K M
Tomczak, J M; https://orcid.org/0000-0003-1581-8799
Schmitt, T
Chang, J; https://orcid.org/0000-0002-4655-1516
Source :
Ivashko, O; Horio, M; Wan, W; Christensen, N B; McNally, D E; Paris, E; Tseng, Y; Shaik, N E; Rønnow, H M; Wei, H I; Adamo, C; Lichtensteiger, C; Gibert, M; Beasley, M R; Shen, K M; Tomczak, J M; Schmitt, T; Chang, J (2019). Strain-engineering Mott-insulating $La_2CuO_4$. Nature Communications, 10:786.
Publication Year :
2019

Abstract

The transition temperature Tc of unconventional superconductivity is often tunable. For a monolayer of FeSe, for example, the sweet spot is uniquely bound to titanium-oxide substrates. By contrast for La2−xSrxCuO4 thin films, such substrates are sub-optimal and the highest Tc is instead obtained using LaSrAlO4. An outstanding challenge is thus to understand the optimal conditions for superconductivity in thin films: which microscopic parameters drive the change in Tc and how can we tune them? Here we demonstrate, by a combination of x-ray absorption and resonant inelastic x-ray scattering spectroscopy, how the Coulomb and magnetic-exchange interaction of La2CuO4 thin films can be enhanced by compressive strain. Our experiments and theoretical calculations establish that the substrate producing the largest Tc under doping also generates the largest nearest neighbour hopping integral, Coulomb and magnetic-exchange interaction. We hence suggest optimising the parent Mott state as a strategy for enhancing the superconducting transition temperature in cuprates.

Details

Database :
OAIster
Journal :
Ivashko, O; Horio, M; Wan, W; Christensen, N B; McNally, D E; Paris, E; Tseng, Y; Shaik, N E; Rønnow, H M; Wei, H I; Adamo, C; Lichtensteiger, C; Gibert, M; Beasley, M R; Shen, K M; Tomczak, J M; Schmitt, T; Chang, J (2019). Strain-engineering Mott-insulating $La_2CuO_4$. Nature Communications, 10:786.
Notes :
application/pdf, info:doi/10.5167/uzh-171139, English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1416174516
Document Type :
Electronic Resource