Direct k-Space Mapping of the Electronic Structure in an Oxide-Oxide Interface

被引：136

作者：

Berner, G. ^{[1
,2
]}

Sing, M. ^{[1
,2
]}

Fujiwara, H. ^{[3
]}

Yasui, A. ^{[4
]}

Saitoh, Y. ^{[4
]}

Yamasaki, A. ^{[3
,5
]}

Nishitani, Y. ^{[5
]}

Sekiyama, A.

Pavlenko, N. ^{[6
,7
]}

Kopp, T. ^{[6
]}

Richter, C. ^{[6
,7
]}

Mannhart, J. ^{[7
]}

Suga, S. ^{[8
]}

Claessen, R. ^{[1
,2
]}

机构：

[1] Univ Wurzburg, Inst Phys, D-97074 Wurzburg, Germany

[2] Univ Wurzburg, Rontgen Ctr Complex Mat Syst RCCM, D-97074 Wurzburg, Germany

[3] Osaka Univ, Grad Sch Engn Sci, Div Mat Phys, Osaka 5608531, Japan

[4] Japan Atom Energy Agcy, Condensed Matter Sci Div, Mikazuki, Hyogo 6795148, Japan

[5] Konan Univ, Fac Sci & Engn, Kobe, Hyogo 6588501, Japan

[6] Univ Augsburg, Ctr Elect Correlat & Magnetism, D-86135 Augsburg, Germany

[7] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[8] Osaka Univ, Inst Sci & Ind Res, Ibaraki, Osaka 5670047, Japan

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 24期

关键词：

LAALO3/SRTIO3; SUPERCONDUCTIVITY; FERROMAGNETISM; PHOTOEMISSION; COEXISTENCE; GAS;

D O I：

10.1103/PhysRevLett.110.247601

中图分类号：

O4 [物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

The interface between LaAlO3 and SrTiO3 hosts a two-dimensional electron system of itinerant carriers, although both oxides are band insulators. Interface ferromagnetism coexisting with superconductivity has been found and attributed to local moments. Experimentally, it has been established that Ti 3d electrons are confined to the interface. Using soft x-ray angle-resolved resonant photoelectron spectroscopy we have directly mapped the interface states in k space. Our data demonstrate a charge dichotomy. A mobile fraction contributes to Fermi surface sheets, whereas a localized portion at higher binding energies is tentatively attributed to electrons trapped by O vacancies in the SrTiO3. While photovoltage effects in the polar LaAlO3 layers cannot be excluded, the apparent absence of surface-related Fermi surface sheets could also be fully reconciled in a recently proposed electronic reconstruction picture where the built-in potential in the LaAlO3 is compensated by surface O vacancies serving also as a charge reservoir.

引用

页数：5

共 36 条

[1]

Photoemission study of the metallic state of lightly electron-doped SrTiO3 [J].

Aiura, Y ;

Hase, I ;

Bando, H ;

Yasue, T ;

Saitoh, T ;

Dessau, DS .

SURFACE SCIENCE, 2002, 515 (01) :61-74

[2]

Mapping the spatial distribution of charge carriers in LaAlO3/SrTiO3 heterostructures [J].

Basletic, M. ;

Maurice, J. -L. ;

Carretero, C. ;

Herranz, G. ;

Copie, O. ;

Bibes, M. ;

Jacquet, E. ;

Bouzehouane, K. ;

Fusil, S. ;

Barthelemy, A. .

NATURE MATERIALS, 2008, 7 (08) :621-625

[3]

LaAlO3/SrTiO3 oxide heterostructures studied by resonant inelastic x-ray scattering [J].

Berner, G. ;

Glawion, S. ;

Walde, J. ;

Pfaff, F. ;

Hollmark, H. ;

Duda, L. -C. ;

Paetel, S. ;

Richter, C. ;

Mannhart, J. ;

Sing, M. ;

Claessen, R. .

PHYSICAL REVIEW B, 2010, 82 (24)

[4]

Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface [J].

Bert, Julie A. ;

Kalisky, Beena ;

Bell, Christopher ;

Kim, Minu ;

Hikita, Yasuyuki ;

Hwang, Harold Y. ;

Moler, Kathryn A. .

NATURE PHYSICS, 2011, 7 (10) :767-771

[5]

Magnetic effects at the interface between non-magnetic oxides [J].

Brinkman, A. ;

Huijben, M. ;

Van Zalk, M. ;

Huijben, J. ;

Zeitler, U. ;

Maan, J. C. ;

Van der Wiel, W. G. ;

Rijnders, G. ;

Blank, D. H. A. ;

Hilgenkamp, H. .

NATURE MATERIALS, 2007, 6 (07) :493-496

[6]

Surface defects and conduction in polar oxide heterostructures [J].

Bristowe, N. C. ;

Littlewood, P. B. ;

Artacho, Emilio .

PHYSICAL REVIEW B, 2011, 83 (20)

[7]

Band Alignment, Built-In Potential, and the Absence of Conductivity at the LaCrO3/SrTiO3(001) Heterojunction [J].

Chambers, S. A. ;

Qiao, L. ;

Droubay, T. C. ;

Kaspar, T. C. ;

Arey, B. W. ;

Sushko, P. V. .

PHYSICAL REVIEW LETTERS, 2011, 107 (20)

[8]

Spectroscopic evidence of in-gap states at the SrTiO3/LaAlO3 ultrathin interfaces [J].

Drera, G. ;

Banfi, F. ;

Canova, F. Federici ;

Borghetti, P. ;

Sangaletti, L. ;

Bondino, F. ;

Magnano, E. ;

Huijben, J. ;

Huijben, M. ;

Rijnders, G. ;

Blank, D. H. A. ;

Hilgenkamp, H. ;

Brinkman, A. .

APPLIED PHYSICS LETTERS, 2011, 98 (05)

[9]

QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials [J].

Giannozzi, Paolo ;

Baroni, Stefano ;

Bonini, Nicola ;

Calandra, Matteo ;

Car, Roberto ;

Cavazzoni, Carlo ;

Ceresoli, Davide ;

Chiarotti, Guido L. ;

Cococcioni, Matteo ;

Dabo, Ismaila ;

Dal Corso, Andrea ;

de Gironcoli, Stefano ;

Fabris, Stefano ;

Fratesi, Guido ;

Gebauer, Ralph ;

Gerstmann, Uwe ;

Gougoussis, Christos ;

Kokalj, Anton ;

Lazzeri, Michele ;

Martin-Samos, Layla ;

Marzari, Nicola ;

Mauri, Francesco ;

Mazzarello, Riccardo ;

Paolini, Stefano ;

Pasquarello, Alfredo ;

Paulatto, Lorenzo ;

Sbraccia, Carlo ;

Scandolo, Sandro ;

Sclauzero, Gabriele ;

Seitsonen, Ari P. ;

Smogunov, Alexander ;

Umari, Paolo ;

Wentzcovitch, Renata M. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2009, 21 (39)

[10]

Electronically coupled complementary interfaces between perovskite band insulators [J].

Huijben, Mark ;

Rijnders, Guus ;

Blank, Dave H. A. ;

Bals, Sara ;

Van Aert, Sandra ;

Verbeeck, Jo ;

Van Tendeloo, Gustaaf ;

Brinkman, Alexander ;

Hilgenkamp, Hans .

NATURE MATERIALS, 2006, 5 (07) :556-560

← 1 2 3 4 →