Philip Ryan
Argonne National Laboratory
164 Papers
896 Citations
Philip Ryan is an academic researcher from Argonne National Laboratory. The author has contributed to research in topics: Antiferromagnetism & Ferromagnetism. The author has an hindex of 34, co-authored 152 publications. Previous affiliations of Philip Ryan include University of Illinois at Chicago & Iowa State University.
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Papers
A Ferroelectric Oxide Made Directly on Silicon
Maitri Warusawithana,Cheng Cen,Charles R. Sleasman,Joseph C. Woicik,Yulan Li,Lena F. Kourkoutis,Jeffrey A. Klug,Hao Li,Philip Ryan,Li Peng Wang,Michael J. Bedzyk,David A. Muller,Long Qing Chen,Jeremy Levy,Darrell G. Schlom +14 more
TL;DR: Ferroelectric functionality in intimate contact with silicon is achieved by growing coherently strained strontium titanate (SrTiO3) films via oxide molecular beam epitaxy in direct contact with Silicon, with no interfacial silicon dioxide.
Polar metals by geometric design
Tae Heon Kim,Danilo Puggioni,Yakun Yuan,Lin Xie,Lin Xie,Hua Zhou,Neil Campbell,Philip Ryan,Yongseong Choi,Jong-Woo Kim,J. R. Patzner,Sangwoo Ryu,J. P. Podkaminer,Julian Irwin,Yanjun Ma,Craig J. Fennie,Mark Rzchowski,Xiaoqing Pan,Venkatraman Gopalan,James M. Rondinelli,Chang-Beom Eom +20 more
TL;DR: The quantum mechanical design and experimental realization of room-temperature polar metals in thin-film ANiO3 perovskite nickelates using a strategy based on atomic-scale control of inversion-preserving (centric) displacements is described and it is predicted that the geometric stabilization approach will provide novel avenues for realizing new multifunctional materials with unusual coexisting properties.
361
Quantifying octahedral rotations in strained perovskite oxide films
Steven J. May,Steven J. May,Jong-Woo Kim,James M. Rondinelli,Evguenia Karapetrova,Nicola A. Spaldin,Anand Bhattacharya,Philip Ryan +7 more
TL;DR: In this article, the authors measured the oxygen positions in LaNiO films to elucidate the coupling between epitaxial strain and oxygen octahedral rotations, and showed how strain systematically modifies both bond angles and lengths in this functional perovskite oxide.
360
Isostructural metal-insulator transition in VO2
Daesu Lee,Bongwook Chung,Yin Shi,Gi-Yeop Kim,Neil Campbell,Fei Xue,Kyung Song,Si-Young Choi,J. P. Podkaminer,Tae Heon Kim,Philip Ryan,Philip Ryan,Jong-Woo Kim,Tula R. Paudel,Jong-Hoon Kang,J. W. Spinuzzi,Dmitri A. Tenne,Evgeny Y. Tsymbal,Mark Rzchowski,Long Qing Chen,Jaichan Lee,Chang-Beom Eom +21 more
TL;DR: An isostructural, purely electronically driven metal-insulator transition is demonstrated in epitaxial heterostructures of an archetypal correlated material, vanadium dioxide, to provide insights into phase transitions of correlated materials and may aid the design of device functionalities.
Enhanced ordering temperatures in antiferromagnetic manganite superlattices
Steven J. May,Philip Ryan,J. L. Robertson,Jong-Woo Kim,T. S. Santos,Evguenia Karapetrova,J. L. Zarestky,Xiaofang Zhai,S. G. E. te Velthuis,James N. Eckstein,S. D. Bader,Anand Bhattacharya +11 more
TL;DR: It is demonstrated that cation-site ordering achieved through digital-synthesis techniques can dramatically enhance the antiferromagnetic ordering temperatures of manganite films, enabling the higher TN values of the superlattices.
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