Quasistatic antiferromagnetism in the quantum wells of SmTiO3/SrTiO3 heterostructures

被引：10

作者：

Need, Ryan F. ^{[1
]}

Marshall, Patrick B. ^{[1
]}

Kenney, Eric ^{[2
]}

Suter, Andreas ^{[3
]}

Prokscha, Thomas ^{[3
]}

Salman, Zaher ^{[3
]}

Kirby, Brian J. ^{[4
]}

Stemmer, Susanne ^{[1
]}

Graf, Michael J. ^{[2
]}

Wilson, Stephen D. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[2] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[3] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland

[4] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

来源：

NPJ QUANTUM MATERIALS | 2018年 / 3卷

基金：

美国国家科学基金会;

关键词：

HIGH-T-C; NEUTRON REFLECTOMETRY; COPPER OXIDES; SUPERCONDUCTIVITY; PSEUDOGAP; COMPETITION; ORDER; BEAM;

D O I：

10.1038/s41535-018-0081-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High carrier density quantum wells embedded within a Mott insulating matrix present a rich arena for exploring unconventional electronic phase behavior ranging from non-Fermi-liquid transport and signatures of quantum criticality to pseudogap formation. Probing the proposed connection between unconventional magnetotransport and incipient electronic order within these quantum wells has however remained an enduring challenge due to the ultra-thin layer thicknesses required. Here we address this challenge by exploring the magnetic properties of high- density SrTiO3 quantum wells embedded within the antiferromagnetic Mott insulator SmTiO3 via muon spin relaxation and polarized neutron reflectometry measurements. The one electron per planar unit cell acquired by the nominal d(0) band insulator SrTiO3 when embedded within a d(1) 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 phase behavior in this quantum critical oxide heterostructure with those observed in bulk Mott materials close to an antiferromagnetic instability.

引用

页数：6

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