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Quasistatic Antiferromagnetism in the Quantum Wells of SmTiO3/SrTiO3 Heterostructures



Ryan F. Need, Patrick B. Marshall, Eric Kenney, Andreas Suter, Thomas Prokscha, Zaher Salman, Brian Kirby, Susanne Stemmer, Michael J. Graf, Stephen D. Wilson


The magnetic properties of high-density SrTiO3 quantum wells embedded within the antiferromagnetic Mott insulator SmTiO3 are explored via muon spin relaxation and polarized neutron reflectometry measurements. The one electron per wel acquired by the nominal d) band insulator SrTiO3 when embedded within a d1 Mott SmTiO3 matrix exhibits slow magnetic fluctuations that begin to freeze into a quasistatic spin state below a critical temperature T*. The appearance of this quasistatic well magnetism coincides with the previously reported opening of a pseudogap in the tunneling spectra of high carrier density wells inside this film architecture. Our data suggest a common origin of the pseudogap behavior in this behavior in this quantum critical oxide heterostructure with those observed in bulk Mott materials close to an antiferromagnetic instability.
Nature Partner Journals Quantum Materials


magnetism, neutron reflectometry, muon spin relaxation


Need, R. , Marshall, P. , Kenney, E. , Suter, A. , Prokscha, T. , Salman, Z. , Kirby, B. , Stemmer, S. , Graf, M. and Wilson, S. (2018), Quasistatic Antiferromagnetism in the Quantum Wells of SmTiO<sub>3</sub>/SrTiO<sub>3</sub> Heterostructures, Nature Partner Journals Quantum Materials, [online], (Accessed April 24, 2024)
Created February 19, 2018, Updated October 12, 2021