Carrier-Controlled Ferromagnetism in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Moetakef, Pouya; Williams, James R.; Ouellette, Daniel G.; Kajdos, Adam P.; Goldhaber‐Gordon, David; Allen, S. J.; Stemmer, Susanne

doi:10.1103/physrevx.2.021014

Cited by 86 publications

(48 citation statements)

References 32 publications

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“…Furthermore, it would be useful to investigate other related materials exhibiting the same phenomena. In particular, recent work on epitaxially grown GdTiO 3 -SrTiO 3 interfaces 53 indicates that ferromagnetism and superconductivity can also coexist in such systems. Being much cleaner than LAO/STO from a materials point of view, these interfaces might provide an attractive environment for the investigation of the ideas proposed in this paper.…”

Section: Discussionmentioning

confidence: 99%

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Magnetic and superconducting ordering in one-dimensional nanostructures at the LaAlO3/SrTiO3interface

et al. 2013

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We formulate a model for magnetic and superconducting ordering in one-dimensional nanostructures at LaAlO3/SrTiO3 interfaces containing both localized magnetic moments and itinerant electrons. Though these both originate in Ti 3d orbitals, the former may be due to electrons more tightly-bound to the interface while the latter are extended over several layers. Only the latter contribute significantly to metallic conduction and superconductivity. In our model, the interplay between the two types of electrons, which is argued to be ferromagnetic, combined with strong spin-orbit coupling of the itinerant electrons, leads to magnetic ordering. Furthermore, we propose a model for interfacial superconductivity, consisting of random superconducting grains in the bulk STO driven, via coupling to the interface conduction band, towards long-ranged or quasi-long-ranged order. Most interestingly, the magnetic order and strong spin orbit coupling can lead in this manner to unconventional interfacial superconductivity, yielding a possible realization of Majorana physics.

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Section: Discussionmentioning

confidence: 99%

“…7, based on the phase diagram in Refs. [52][53][54]. Therefore, it is also important to understand when and why they do not occur.…”

Section: Discussionmentioning

confidence: 99%

Magnetic and superconducting ordering in one-dimensional nanostructures at the LaAlO3/SrTiO3interface

et al. 2013

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“…The STO/GTO system has been studied extensively [15][16][17][18][19][20][21][22][23][24][25][26], and the 2DEG here has been found to exhibit extremely high carrier densities and ferromagnetic effects, with both electrostatic and doping modulation being observed to change the carrier properties. The proposed explanation for the 2DEG creation can be found in a simple charge transfer picture [7,14,16].…”

Section: (Sto) and The Ferromagnetic Mott Insulator Gdtio 3 (Gto)mentioning

confidence: 99%

Energetic, spatial, and momentum character of the electronic structure at a buried interface: The two-dimensional electron gas between two metal oxides

Nemšák¹,

Conti²,

Gray³

et al. 2016

Phys. Rev. B

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The interfaces between two condensed phases often exhibit emergent physical properties that can lead to new physics and novel device applications and are the subject of intense study in many disciplines. We here apply experimental and theoretical techniques to the characterization of one such interesting interface system: the two-dimensional electron gas (2DEG) formed in multilayers consisting of SrTiO 3 (STO) and GdTiO 3 (GTO). This system has been the subject of multiple studies recently and shown to exhibit very high carrier charge densities and ferromagnetic effects, among other intriguing properties. We have studied a 2DEG-forming multilayer of the form [6 unit cells (u.c.) STO/3 u.c. of GTO] 20 using a unique array of photoemission techniques including soft and hard x-ray excitation, soft x-ray angle-resolved photoemission, core-level spectroscopy, resonant excitation, and standing-wave effects, as well as theoretical calculations of the electronic structure at several levels and of the actual photoemission process. Standing-wave measurements below and above a strong resonance have been exploited as a powerful method for studying the 2DEG depth distribution. We have thus characterized the spatial and momentum properties of this 2DEG in detail, determining via depth-distribution measurements that it is spread throughout the 6 u.c. layer of STO and measuring the momentum dispersion of its states. The experimental results are supported in several ways by theory, leading to a much more complete picture of the nature of this 2DEG and suggesting that oxygen vacancies are not the origin of it. Similar multitechnique photoemission studies of such states at buried interfaces, combined with comparable theory, will be a very fruitful future approach for exploring and modifying the fascinating world of buried-interface physics and chemistry.

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“…4 Thin (<2 nm) quantum wells of SrTiO 3 embedded in GdTiO 3 show magnetoresistance hysteresis at low temperatures. 5 It was suggested that the proximity to the ferrimagnetic GdTiO 3 likely plays a role, but the magnetic state of the SrTiO 3 was not resolved. For example, it is possible that the SrTiO 3 quantum well has become magnetic due to exchange coupling.…”

mentioning

confidence: 99%

“…4 In contrast to GdTiO 3 , which is ferrimagnetic with a Curie temperature of ∼30 K in bulk 15 and ∼20 K in the samples with 4-nm GdTiO 3 , 5 SmTiO 3 is antiferromagnetic with a Néel temperature of ∼50 K. 16 Electrical and structural characterization, as well as growth details have been described elsewhere. 5,14,17,18 The carrier mobility was an order of magnitude higher than in conducting, doped GdTiO 3 or SmTiO 3 , showing that electrical transport occurs only in the SrTiO 3 quantum well [further evidence comes from magnetotransport; Seebeck measurements, which are SrTiO 3 -like; 19 and the band offsets, which favor charge transfer into the SrTiO 3 (Refs. 4 and 20)].…”

mentioning

confidence: 99%

Interface-induced magnetism in perovskite quantum wells

Jackson

Stemmer

2013

Phys. Rev. B

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We investigate the angular dependence of the magnetoresistance of thin (< 1 nm), metallic SrTiO 3 quantum wells epitaxially embedded in insulating, ferrimagnetic GdTiO 3 and insulating, antiferromagnetic SmTiO 3 , respectively. The SrTiO 3 quantum wells contain a high density of mobile electrons (~7 ×10 14 cm −2 ). We show that the longitudinal and transverse magnetoresistance in the structures with GdTiO 3 are consistent with anisotropic magnetoresistance, and thus indicative of induced ferromagnetism in the SrTiO 3 , rather than a nonequilibrium proximity effect. Comparison with the structures with antiferromagnetic SmTiO 3 shows that the properties of thin SrTiO 3 quantum wells can be tuned to obtain magnetic states that do not exist in the bulk material.

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Carrier-Controlled Ferromagnetism inSrTiO3

Cited by 86 publications

References 32 publications

Magnetic and superconducting ordering in one-dimensional nanostructures at the LaAlO3/SrTiO3interface

Magnetic and superconducting ordering in one-dimensional nanostructures at the LaAlO3/SrTiO3interface

Energetic, spatial, and momentum character of the electronic structure at a buried interface: The two-dimensional electron gas between two metal oxides

Interface-induced magnetism in perovskite quantum wells

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