Publication: Anisotropic magnetotransport in SrTiO_3 surface electron gases generated by Ar^+ irradiation
Loading...
Official URL
Full text at PDC
Publication Date
2011-06-23
Authors
Tornos, J.
Gutierrez del Olmo, M.
Sánchez Santolino, G.
Nemes, N.M.
Gárcia Hernández, M.
Méndez Martín, Bianchi
Piqueras de Noriega, Javier
Antorrena, G.
Morellon, L.
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Citations
Exportar
Abstract
Metallic surface layers are fabricated by doping (100) SrTiO_3 (STO) single crystals with oxygen vacancies generated by bombardment with Ar ions from an rf plasma source. The presence of oxygen vacancies is confirmed by cathodoluminescence and x-ray photoemission spectroscopy. This technique produces a surface electron gas with high values of the sheet carrier density (n_(2D) = 2.45x10^17 cm^(-2)). A strong increase (300%) of the low-temperature magnetoresistance is observed when the magnetic field is rotated away from the surface, characteristic of orbital effects of confined electrons. We estimate the width of the confinement region to be in the 200-300 nm range. When a magnetic field is applied in the surface plane and parallel to the current direction, a large negative magnetoresistance is found below the structural transition of the STO, which is discussed in terms of spin-orbit scattering. On further reduction of temperature, there is a change to a positive magnetoresistance regime due to the scattering of charge carriers at the disordered surface region.
Description
©2011 American Physical Society.
This work was supported by Spanish MICINN Grant No. MAT 2008 06517, Consolider Ingenio Grant No. CSD2009-00013 (IMAGINE), and CAM Grant No. S2009-MAT 1756 (PHAMA).
UCM subjects
Unesco subjects
Keywords
Citation
1J. F Shooley, W. R. Hosler, and M. L. Cohen, Phys. Rev. Lett. 12, 474 (1964).
2M. P.Warushawithana, C. Cen, C. R. Sleasman, J. C.Woicik, Y. Li, L. F. Kourkoutis, J. A. Klug, H. Li, P. Ryan, L. P.Wang, M. Bedzyk, D. A. Muller, L. Q. Chen, J. Levy, and D. G. Schlom, Science 324, 367 (2009).
3A. Ohtomo and H. Y. Hwang, Nature (London) 427, 423 (2004).
4N. Reyren, S. Thiel, A. D. Caviglia, L. F. Kourkoutis, G. Hammerl, C. Richter, C. W. Schneider, T. Kopp, A.-S. Ruetschi, D. Jaccard, M. Gabay, D. A. Muller, J.-M. Triscone, and J. Mannhart, Science 317, 1196 (2007).
5A. D. Caviglia, S. Gariglio, N. Reyren, D. Jaccard, T. Schneider, M. Gabay, S. Thiel, G. Hammerl, J. Mannhart, and J.-M. Triscone, Nature (London) 456, 624 (2008).
6G. Herranz, M. Basletic, M. Bibes, C. Carretero, E. Tafra, E. Jacquet, K. Bouzehouane, C. Deranlot, A. Hamzic, J. M. Broto, A. Barthelemy, and A. Fert, Phys. Rev. Lett. 98, 216803 (2007).
7A. Kalabukhov, R. Gunnarsson, J. Borjesson, E. Olsson, T. Claeson, and D. Winkler, Phys. Rev. B 75, 121404 (2007).
8P. R. Willmott, S. A. Pauli, R. Herger, C. M. Schleputz, D. Martoccia, B. D. Patterson, B. Delley, R. Clarke, D. Kumah, C. Cionca, and Y. Yacoby, Phys. Rev. Lett. 99, 155502 (2007).
9D. W. Reagor and V. Y. Butko, Nature Mater. 4, 593 (2005).
10V. Y. Butko, H.Wang, and D. Reagor, Nanotechnology 19, 305401 (2008).
11J. H. Ngai, Y. Segal, D. Su, Y. Zhu, F. J. Walker, S. Ismail-Beigi, K. LeHur, and C. H. Ahn, Phys. Rev. B 81, 241307 (2010).
12G. Koster, B. L. Kropman, G. J. H. M. Rijnders, D. H. A. Blank, and H. Rogalla, Appl. Phys. Lett. 73, 2920 (1998).
13Y. Tokura, Y. Taguchi, Y. Okada, Y. Fujishima, T. Arima, K. Kumagai, and Y. Iye, Phys. Rev. Lett. 70, 2126 (1993).
14M. Basletic, J. L. Maurice, C. Carretero, G. Herranz, O. Copie, M. Bibes, E. Jacquet, K. Bouzehouane, S. Fusil, andA. Barthelemy, Nature Mater. 7, 621 (2008).
15D. Kan, T. Terashima, R. Kanda, A. Masuno, K. Tanaka, S. Chu, H. Kan, A. Ishizumi, Y. Kanemitsu, Y. Shimakawa, andM. Takano, Nature Mater. 4, 816 (2005).
16D. Kan, R. Kanda, Y. Kanemitsu, Y. Shimakawa, and M. Takano, Appl. Phys. Lett. 88, 191916 (2006).
17A. Rubano, D. Paparo, F. Miletto Granozio, U. Scotti di Uccio, and L. Marrucci, J. Appl. Phys. 106, 103515 (2009).
18D. Drouin, A. R. Couture, D. Joly, X. Tastet, V. Aimez, and R. Gauvin, Scanning 29, 92 (2007).
19O. L. Tufte and P. W. Chapman, Phys. Rev. 155, 796 (1967).
20H. P. R. Frederikse, W. R. Thurbe, and W. R. Hosler, Phys. Rev. 134, A442 (1964).
21O. L. Tufte and E. L. Stelzer, Phys. Rev. 173, 775 (1964).
22S. Das Sarma and E. H. Hwang, Phys. Rev. Lett. 84, 5596 (2000).
23M. Ben Shalom, C. W. Tai, Y. Lereah, M. Sachs, E. Levy, D. Rakhmilevitch, A. Palevski, and Y. Dagan, Phys. Rev. B 80, 140403 (2009).
24O. Copie, V. Garcia, C. Bodefeld, C. Carretero, M. Bibes, G. Herranz, E. Jacquet, J. L. Maurice, B. Vinter, S. Fusil, K. Bouzehouane, H. Jaffres, and A. Barthelemy, Phys. Rev. Lett. 102, 216804 (2009).
25H. Yasuda, Y. Yamada, T. Tayagaki, and Y. Kanemitsu, Phys. Rev. B 78, 233202 (2008).
26G. Herranz, O. Copie, A. Gentils, E. Tafra, M. Basletic, F. Fortuna, K. Bouzehouane, S. Fusil, E. Jacquet, C. Carretero, M. Bibes, A. Hamzic, and A. Barthelemy, J. Appl. Phys. 107, 103704 (2010).
27H. Weiss and H. Welter, Z. Phys. 138, 322 (1957).
28G. Bergmann, Phys. Rev. Lett. 48, 1046 (1982).
29A. D. Caviglia, M. Gabay, S. Gariglio, N. Reyren, C. Cancellieri, and J. M. Triscone, Phys. Rev. Lett. 104, 126803 (2010).
30P. A. Lee and T. V. Ramakrishnan, Rev. Mod. Phys. 57, 287 (1985).
31R. P. Khosla and J. R. Fischer, Phys. Rev. B 2, 4084 (1970).
32K. Yosida, Phys. Rev. 107, 396 (1957).
33M. Sawicki, T. Dietl, J. Kossut, J. Igalson, T. Wojtowicz, and W. Plesiewicz, Phys. Rev. Lett. 56, 508 (1986).
34N. E. Phillips, J. C. Ho, D. P. Woody, J. K. Hulm, and C. K. Jones, Phys. Lett. A 29, 356 (1969).
35R. J. Elliott, Phys. Rev. 96, 266 (1954).
36M. Ben Shalom, M. Sachs, D. Rakhmilevitch, A. Palevski, and Y. Dagan, Phys. Rev. Lett. 104, 126802 (2010).
37F. Reuss, S. Frank, C. Kirchner, R. Kling, Th. Gruber, and A.Waag, Appl. Phys. Lett. 87, 112104 (2005).
38L. F. Matthiess, Phys. Rev. B 6, 4740 (1972).
39R. G. Chambers, Proc. R. Soc. London, Ser. A 202, 378 (1950).
40Z. Sefrioui, D. Arias, M. Verela, J. E. Villegas, M. A. Lopez de La Torre, C. Leon, G. D. Loos, and J. Santamaria, Phys. Rev. B 60, 15423 (1999).
41X. J. Chen, H.-U. Habermeier, H. Zhang, G. Gu, M. Verela, J. Santamaria, and C. C. Almasan, Phys. Rev. B 72, 104403 (2005). 245120-