Growth of superconducting MgB2 thin films via postannealing techniques

被引：51

作者：

Kang, WN ^{[1
]}

Choi, EM ^{[1
]}

Kim, HJ ^{[1
]}

Kim, HJ ^{[1
]}

Lee, S ^{[1
]}

机构：

[1] Pohang Univ Sci & Technol, Dept Phys, Natl Creat Res Initiat Ctr Superconduct, Kyungbuk 790784, South Korea

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2003年 / 385卷 / 1-2期

关键词：

thin film growth; annealing; critical current; grain alignment;

D O I：

10.1016/S0921-4534(02)02310-9

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report the effect of annealing on the superconductivity of MgB2 thin films as a function of the postannealing temperature in the range from 700 to 950 degreesC and of the postannealing time in the range from 30 to 120 min. On annealing at 900 degreesC for 30 min, we obtained the best-quality MgB2 films with a transition temperature of 39 K and a critical current density of similar to10(7) A/cm(2). Using scanning electron microscopy, we also investigated the film growth mechanism. The samples annealed at higher temperatures showed larger grain sizes, well-aligned crystal structures with preferential orientation along the c-axis, and smooth surface morphologies. However, a longer annealing time prevented the alignment of grains and reduced superconductivity, indicating a strong interfacial reaction between the substrate and the MgB2 film. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

收藏

页码：24 / 30

页数：7

相关论文

共 36 条

[1] MAGNETIZATION OF HIGH-FIELD SUPERCONDUCTORS [J].

BEAN, CP .

REVIEWS OF MODERN PHYSICS, 1964, 36 (1P1) :31-+

[2] Superconducting quantum interference device based on MgB2 nanobridges [J].

Brinkman, A ;

Veldhuis, D ;

Mijatovic, D ;

Rijnders, G ;

Blank, DHA ;

Hilgenkamp, H ;

Rogalla, H .

APPLIED PHYSICS LETTERS, 2001, 79 (15) :2420-2422

[3] Directly coupled superconducting quantum interference device magnetometer fabricated in magnesium diboride by focused ion beam [J].

Burnell, G ;

Kang, DJ ;

Ansell, DA ;

Lee, HN ;

Moon, SH ;

Tarte, EJ ;

Blamire, MG .

APPLIED PHYSICS LETTERS, 2002, 81 (01) :102-104

[4] High critical current density and enhanced irreversibility field in superconducting MgB2 thin films [J].

Eom, CB ;

Lee, MK ;

Choi, JH ;

Belenky, LJ ;

Song, X ;

Cooley, LD ;

Naus, MT ;

Patnaik, S ;

Jiang, J ;

Rikel, M ;

Polyanskii, A ;

Gurevich, A ;

Cai, XY ;

Bu, SD ;

Babcock, SE ;

Hellstrom, EE ;

Larbalestier, DC ;

Rogado, N ;

Regan, KA ;

Hayward, MA ;

He, T ;

Slusky, JS ;

Inumaru, K ;

Haas, MK ;

Cava, RJ .

NATURE, 2001, 411 (6837) :558-560

[5] Growth of c-oriented MgB2 thin films by pulsed laser deposition:: structural characterization and electronic anisotropy [J].

Ferdeghini, C ;

Ferrando, V ;

Grassano, G ;

Ramadan, W ;

Bellingeri, E ;

Braccini, V ;

Marré, D ;

Manfrinetti, P ;

Palenzona, A ;

Borgatti, F ;

Felici, R ;

Lee, TL .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2001, 14 (11) :952-957

[6] High transport currents in mechanically reinforced MgB2 wires [J].

Goldacker, W ;

Schlachter, SI ;

Zimmer, S ;

Reiner, H .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2001, 14 (09) :787-793

[7] Improvement of critical current in MgB2/Fe superconducting wires by a ferromagnetic sheath [J].

Horvat, J ;

Wang, XL ;

Soltanian, S ;

Dou, SX .

APPLIED PHYSICS LETTERS, 2002, 80 (05) :829-831

[8] High-quality MgB2 films on boron crystals with onset Tc of 41.7 K [J].

Hur, N ;

Sharma, PA ;

Guha, S ;

Cieplak, MZ ;

Werder, DJ ;

Horibe, Y ;

Chen, CH ;

Cheong, SW .

APPLIED PHYSICS LETTERS, 2001, 79 (25) :4180-4182

[9] Two-band superconductivity in MgB2 -: art. no. 187002 [J].

Iavarone, M ;

Karapetrov, G ;

Koshelev, AE ;

Kwok, WK ;

Crabtree, GW ;

Hinks, DG ;

Kang, WN ;

Choi, EM ;

Kim, HJ ;

Kim, HJ ;

Lee, SI .

PHYSICAL REVIEW LETTERS, 2002, 89 (18)

[10] Energy gap, penetration depth, and surface resistance of MgB2 thin films determined by microwave resonator measurements -: art. no. 104521 [J].

Jin, BB ;

Klein, N ;

Kang, WN ;

Kim, HJ ;

Choi, EM ;

Lee, SI ;

Dahm, T ;

Maki, K .

PHYSICAL REVIEW B, 2002, 66 (10) :1045211-1045216

← 1 2 3 4 →