Thickness dependent transport properties and percolative phase separation in polycrystalline manganite thin films

被引：7

作者：

Chen, Y. H. ^{[1
]}

Wu, T. B. ^{[2
]}

机构：

[1] Natl Cheng Kung Univ, Dept Earth Sci, Tainan 701, Taiwan

[2] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 22期

关键词：

atomic force microscopy; electrical conductivity; ferromagnetic materials; grain boundaries; hopping conduction; lanthanum compounds; magnetic thin films; metal-insulator transition; percolation; phase separation; strontium compounds;

D O I：

10.1063/1.3037202

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effects of film thicknesses on the electronic transport and percolative metal-insulator (M-I) transition of La1-xSrxMnO3 (LSMO) films have been investigated. The conductivity increases with the layer thickness; this is regarded as the relaxation of tensile strains and reduction in grain boundaries (fewer scattering centers) as well as shorter hopping distances, which suppresses the Jahn-Teller distortion or enhances the double exchange. It is also observed by conductive atomic force microscopy (CAFM) that metallic and insulating regions coexist in LSMO films. The domains undergo a percolative M-I transition, and TM-I observed by CAFM is consistent with the result of four-point probe measurements.

引用

页数：3

共 17 条

[1] Nanoscale multiphase separation at La2/3Ca1/3MnO3/SrTiO3 interfaces -: art. no. 067210 [J].

Bibes, M ;

Balcells, L ;

Valencia, S ;

Fontcuberta, J ;

Wojcik, M ;

Jedryka, E ;

Nadolski, S .

PHYSICAL REVIEW LETTERS, 2001, 87 (06) :67210-1

[2] Surface electronic structure and magnetic properties of doped manganites [J].

Calderon, MJ ;

Brey, L ;

Guinea, F .

PHYSICAL REVIEW B, 1999, 60 (09) :6698-6704

[3] Colossal magnetoresistant materials: The key role of phase separation [J].

Dagotto, E ;

Hotta, T ;

Moreo, A .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 344 (1-3) :1-153

[4] Oxygen pressure and thickness dependent lattice strain in La0.7Sr0.3MnO3 films [J].

Dho, J ;

Hur, NH ;

Kim, IS ;

Park, YK .

JOURNAL OF APPLIED PHYSICS, 2003, 94 (12) :7670-7674

[5] Phase diagram of tetragonal manganites [J].

Fang, Z ;

Solovyev, IV ;

Terakura, K .

PHYSICAL REVIEW LETTERS, 2000, 84 (14) :3169-3172

[6] The thickness dependence of the effect of pressures on magnetic and electronic properties of thin films of La2/3Ca1/3MnO3 [J].

Jacob, S ;

Roch, T ;

Razavi, FS ;

Gross, GM ;

Habermeier, HU .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (04) :2232-2235

[7] Evolution of strain-dependent transport properties in ultrathin La0.67Sr0.33MnO3 films [J].

Ju, HL ;

Krishnan, KM ;

Lederman, D .

JOURNAL OF APPLIED PHYSICS, 1998, 83 (11) :7073-7075

[8]

LZUMI M, 1998, APPL PHYS LETT, V73, P2497

[9] Mesoscopic texture in manganites [J].

Mathur, N ;

Littlewood, P .

PHYSICS TODAY, 2003, 56 (01) :25-30

[10] Magnetization distribution in the mixed-phase state of hole-doped manganites [J].

Murakami, Y ;

Yoo, JH ;

Shindo, D ;

Atou, T ;

Kikuchi, M .

NATURE, 2003, 423 (6943) :965-968

← 1 2 →