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Reconciling Monolayer and Bilayer $J_{eff} = 1 / 2$ Square Lattices in Hybrid Oxide Superlattice

https://doi.org/10.1103/PhysRevLett.129.187201

Gong, Dongliang ; Yang, Junyi ; Hao, Lin ; Horak, Lukas ; Xin, Yan ; Karapetrova, Evguenia ; Strempfer, Jörg ; Choi, Yongseong ; Kim, Jong-Woo ; Ryan, Philip J. ; et al ( October 2022 , Physical Review Letters)

Free, publicly-accessible full text available October 1, 2023
Quantitative relationship between structural orthorhombicity, shear modulus, and heat capacity anomaly of the nematic transition in iron-based superconductors

https://doi.org/10.1103/PhysRevB.105.064513

Sanchez, Joshua Javier ; Malinowski, Paul ; Kim, Jong-Woo ; Ryan, Philip ; Chu, Jiun-Haw ( February 2022 , Physical Review B)

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Quasi-Two-Dimensional Anomalous Hall Mott Insulator of Topologically Engineered $J_{eff} = 1 / 2$ Electrons

https://doi.org/10.1103/PhysRevX.12.031015

Yang, Junyi ; Suwa, Hidemaro ; Meyers, Derek ; Zhang, Han ; Horak, Lukas ; Wang, Zhaosheng ; Fabbris, Gilberto ; Choi, Yongseong ; Karapetrova, Jenia ; Kim, Jong-Woo ; et al ( July 2022 , Physical Review X)

Free, publicly-accessible full text available July 1, 2023
Strongly anisotropic antiferromagnetic coupling in ${EuFe}_{2} {As}_{2}$ revealed by stress detwinning

https://doi.org/10.1103/PhysRevB.104.104413

Sanchez, Joshua J. ; Fabbris, Gilberto ; Choi, Yongseong ; Shi, Yue ; Malinowski, Paul ; Pandey, Shashi ; Liu, Jian ; Mazin, I. I. ; Kim, Jong-Woo ; Ryan, Philip ; et al ( September 2021 , Physical Review B)

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Frequency-dependent suppression of field-induced polarization rotation in relaxor ferroelectric thin films

https://doi.org/10.1016/j.matt.2021.04.017

Kim, Jieun ; Meyers, Derek J. ; Kumar, Abinash ; Fernandez, Abel ; Velarde, Gabriel A.P. ; Tian, Zishen ; Kim, Jong-Woo ; LeBeau, James M. ; Ryan, Philip J. ; Martin, Lane W. ( July 2021 , Matter)

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Magnetic Weyl Semimetallic Phase in Thin Films of ${Eu}_{2} {Ir}_{2} O_{7}$

https://doi.org/10.1103/PhysRevLett.127.277204

Liu, Xiaoran ; Fang, Shiang ; Fu, Yixing ; Ge, Wenbo ; Kareev, Mikhail ; Kim, Jong-Woo ; Choi, Yongseong ; Karapetrova, Evguenia ; Zhang, Qinghua ; Gu, Lin ; et al ( December 2021 , Physical Review Letters)

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Suppression of superconductivity by anisotropic strain near a nematic quantum critical point

https://doi.org/10.1038/s41567-020-0983-9

Malinowski, Paul ; Jiang, Qianni ; Sanchez, Joshua J. ; Mutch, Joshua ; Liu, Zhaoyu ; Went, Preston ; Liu, Jian ; Ryan, Philip J. ; Kim, Jong-Woo ; Chu, Jiun-Haw ( December 2020 , Nature Physics)

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Self-Assembled Periodic Nanostructures Using Martensitic Phase Transformations

https://doi.org/10.1021/acs.nanolett.0c03708

Prakash, Abhinav ; Wang, Tianqi ; Bucsek, Ashley ; Truttmann, Tristan K. ; Fali, Alireza ; Cotrufo, Michele ; Yun, Hwanhui ; Kim, Jong-Woo ; Ryan, Philip J. ; Mkhoyan, K. Andre ; et al ( February 2021 , Nano Letters)

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Nanometer-Thick Sr ₂ IrO ₄ Freestanding Films for Flexible Electronics

https://doi.org/10.1021/acsanm.0c01351

Shrestha, Sujan ; Coile, Matthew ; Zhu, Menglin ; Souri, Maryam ; Kim, Jiwoong ; Pandey, Rina ; Brill, Joseph W. ; Hwang, Jinwoo ; Kim, Jong-Woo ; Seo, Ambrose ( July 2020 , ACS Applied Nano Materials)

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Superconductivity in undoped BaFe ₂ As ₂ by tetrahedral geometry design

https://doi.org/10.1073/pnas.2001123117

Kang, Jong-Hoon ; Kim, Jong-Woo ; Ryan, Philip J. ; Xie, Lin ; Guo, Lu ; Sundahl, Chris ; Schad, Jonathon ; Campbell, Neil ; Collantes, Yesusa G. ; Hellstrom, Eric E. ; et al ( August 2020 , Proceedings of the National Academy of Sciences)

Fe-based superconductors exhibit a diverse interplay between charge, orbital, and magnetic ordering. Variations in atomic geometry affect electron hopping between Fe atoms and the Fermi surface topology, influencing magnetic frustration and the pairing strength through changes of orbital overlap and occupancies. Here, we experimentally demonstrate a systematic approach to realize superconductivity without chemical doping in BaFe₂As₂, employing geometric design within an epitaxial heterostructure. We control both tetragonality and orthorhombicity in BaFe₂As₂through superlattice engineering, which we experimentally find to induce superconductivity when the As−Fe−As bond angle approaches that in a regular tetrahedron. This approach to superlattice design could lead to insights into low-dimensional superconductivity in Fe-based superconductors.

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