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Song, Qi

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Song

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Song, Qi
Author's Publications: search.filters.isAuthorOfPublication.f207bf57-07b0-4565-9a55-c2a5d3f658d5

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    Antiferromagnetic metal phase in an electron-doped rare-earth nickelate
    (Springer Science and Business Media LLC, 2023-01-30) Song, Qi; Doyle, Spencer; Pan, Grace A.; El Baggari, Ismail; Ferenc Segedin, Dan; Cordova Carrizales, Denisse; Nordlander, Johanna; Tzschaschel, Christian; Ehrets, James R.; Hasan, Zubia; El-Sherif, Hesham; Krishna, Jyoti; Hanson, Chase; LaBollita, Harrison; Bostwick, Aaron; Jozwiak, Chris; Rotenberg, Eli; Xu, Su-Yang; Lanzara, Alessandra; N'Diaye, Alpha T.; Heikes, Colin A.; Liu, Yaohua; Paik, Hanjong; Brooks, Charles M.; Pamuk, Betül; Heron, John T.; Shafer, Padraic; Ratcliff, William D.; Botana, Antia S.; Moreschini, Luca; Mundy, Julia A.
    Long viewed as passive elements, antiferromagnetic materials have emerged as promising candidates for spintronic devices due to their insensitivity to external fields and potential for high-speed switching. Recent work exploiting spin and orbital effects has identified ways to electrically control and probe the spins in metallic antiferromagnets, especially in noncollinear or noncentrosymmetric spin structures. The rare earth nickelate NdNiO3 is known to be a noncollinear antiferromagnet where the onset of antiferromagnetic ordering is concomitant with a transition to an insulating state. Here, we find that for low electron doping, the magnetic order on the nickel site is preserved while electronically a new metallic phase is induced. We show that this metallic phase has a Fermi surface that is mostly gapped by an electronic reconstruction driven by the bond disproportionation. Furthermore, we demonstrate the ability to write to and read from the spin structure via a large zero-field planar Hall effect. Our results expand the already rich phase diagram of the rare-earth nickelates and may enable spintronics applications in this family of correlated oxides.
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    Superconductivity in a quintuple-layer square-planar nickelate
    (Springer Science and Business Media LLC, 2021-11-22) Pan, Grace; Ferenc Segedin, Dan; LaBollita, Harrison; Song, Qi; Nica, Emilian M.; Goodge, Berit H.; Pierce, Andrew T.; Doyle, Spencer; Novakov, Steve; Córdova Carrizales, Denisse; N'Diaye, Alpha T.; Shafer, Padraic; Paik, Hanjong; Heron, John T.; Mason, Jarad A.; Yacoby, Amir; Kourkoutis, Lena F.; Erten, Onur; Brooks, Charles M.; Botana, Antia S.; Mundy, Julia A.
    Since the discovery of high-temperature superconductivity in copper oxide (cuprate) materials, there has been sustained efforts to both understand the origins of this phase and discover new cuprate-like superconducting materials. One prime materials platform has been the rare-earth nickelates and indeed superconductivity was recently discovered in the doped compound Nd0.8Sr0.2NiO2. Undoped NdNiO2 belongs to a series of layered square-planar nickelates with chemical formula Ndn+1NinO2n+2 and is known as the ‘infinite-layer’ (n = ∞) nickelate. Here, we report the synthesis of the quintuple-layer (n = 5) member of this series, Nd6Ni5O12, in which optimal cuprate-like electron filling (d8.8) is achieved without chemical doping. We observe a superconducting transition beginning at ∼13 K. Electronic structure calculations, in tandem with magnetoresistive and spectroscopic measurements, suggest that Nd6Ni5O12 interpolates between cuprate-like and infinite-layer nickelate-like behavior. In engineering a distinct superconducting nickelate, we identify the square-planar nickelates as a new family of superconductors which can be tuned via both doping and dimensionality.