Long-lived near-infrared photoinduced absorption in LaSrAlO4 excited with visible light

被引：6

作者：

Demsar, J.

Gozar, A.

Thorsmolle, V. K.

Taylor, A. J.

Bozovic, I.

机构：

[1] Jozef Stefan Inst, SI-1000 Ljubljana, Slovenia

[2] Brookhaven Natl Lab, Upton, NY 11973 USA

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[4] Ecole Polytech Fed Lausanne, CH-1015 Lausanne, Switzerland

[5] Univ Konstanz, Dept Phys, D-78457 Constance, Germany

来源：

PHYSICAL REVIEW B | 2007年 / 76卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.76.054304

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Here, we report on studies of photoinduced carrier dynamics in LaSrAlO4. In samples annealed in a reductive atmosphere, intense illumination by sub-band-gap photons results in strong photoinduced absorption (PIA) centered at about 0.7 eV. As a function of temperature, PIA disappears above 200 K, but at 4 K, it has a lifetime of several hours. The nonlinear dependence of PIA on light fluence enables "writing" or "erasing" this optical memory effect by using visible and infrared photons, respectively. Our results can be explained within a three-level scheme and are discussed in a scenario that involves trapping of photoexcited electrons at oxygen-vacancy sites.

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页数：6

相关论文

共 25 条

[1] Giant proximity effect in cuprate superconductors [J].

Bozovic, I ;

Logvenov, G ;

Verhoeven, MAJ ;

Caputo, P ;

Goldobin, E ;

Beasley, MR .

PHYSICAL REVIEW LETTERS, 2004, 93 (15) :157002-1

[2] Epitaxial strain and superconductivity in La2-xSrxCuO4 thin films -: art. no. 107001 [J].

Bozovic, I ;

Logvenov, G ;

Belca, I ;

Narimbetov, B ;

Sveklo, I .

PHYSICAL REVIEW LETTERS, 2002, 89 (10) :107001-107001

[3]

BOZOVIC I, 2003, NATURE, V873, P422

[4] LOW-LOSS SUBSTRATE FOR MICROWAVE APPLICATION OF HIGH-TEMPERATURE SUPERCONDUCTOR FILMS [J].

BROWN, R ;

PENDRICK, V ;

KALOKITIS, D ;

CHAI, BHT .

APPLIED PHYSICS LETTERS, 1990, 57 (13) :1351-1353

[5] Far-infrared optical properties of SrLaAlO4 single crystal [J].

Chen, GX ;

Ge, YJ ;

Bi, CZ ;

Qiu, XG ;

Zhao, BR .

JOURNAL OF APPLIED PHYSICS, 2004, 95 (07) :3417-3421

[6] The role of defects in persistent photoconductivity in YBa2Cu3O6+x [J].

Federici, JF ;

Bubb, DM .

JOURNAL OF SUPERCONDUCTIVITY, 2001, 14 (02) :331-340

[7] Light-induced charge transfer and kinetics of the NIR absorption of Nb4+ polarons in SBN crystals at low temperatures [J].

Gao, M ;

Pankrath, R ;

Kapphan, S ;

Vikhnin, V .

APPLIED PHYSICS B-LASERS AND OPTICS, 1999, 68 (05) :849-858

[8] Photodoping effects in high critical temperature superconducting films and Josephson junctions [J].

Gilabert, A ;

Hoffmann, A ;

Medici, MG ;

Schuller, IK .

JOURNAL OF SUPERCONDUCTIVITY, 2000, 13 (01) :1-20

[9] ON THE PREPARATION AND CRYSTAL-GROWTH OF SRLAALO4 [J].

GLOUBOKOV, A ;

JABLONSKI, R ;

RYBAROMANOWSKI, W ;

SASS, J ;

PAJACZKOWSKA, A ;

UECKER, R ;

REICHE, P .

JOURNAL OF CRYSTAL GROWTH, 1995, 147 (1-2) :123-129

[10] Optical anisotropy of SrLaAlO4 and SrLaAl0.75Ga0.25O4 single crystals [J].

Hora, J ;

Navratil, K ;

Humlicek, J ;

Berkowski, M .

PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1996, 195 (02) :625-635