TITLE

Correlation between the superconducting and structural properties in MgB[sub 2] thin films prepared by molecular-beam epitaxy

AUTHOR(S)
Yamazaki, Hiroki; Hikita, Yasuyuki; Hori, Hiroki; Takaqib, Hidenori
PUB. DATE
November 2003
SOURCE
Applied Physics Letters;11/3/2003, Vol. 83 Issue 18, p3740
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Superconducting MgB[sub 2] films were prepared on an Al[sub 2]O[sub 3](0001) substrate by codeposition of Mg and B using the molecular-beam epitaxy technique and the effects of the growth conditions on the structural and the superconducting properties were extensively investigated. The superconducting transition temperature T[sub c] shows a peak as a function of the deposition-rate ratio of Mg to B[sub 2] and the stoichiometric composition is likely realized at the T[sub c] peak. The optimum substrate temperature T[sub s] was found to be 330 °C. Detailed structural characterizations indicate the strong suppression of structural coherence in the stoichiometric and Mg-rich films. This accounts for the fact that optimized T[sub c] (26.6 K) is still lower than bulk T[sub c] like in previous molecular-beam epitaxy studies. We argue that such structural disorder originates from epitaxial strain due to the lattice mismatch between the film and the substrate. © 2003 American Institute of Physics.
ACCESSION #
11210013

 

Related Articles

  • Study of Nb epitaxial growth on Cu(111) at sub-monolayer level. Clavero, Cesar; Guisinger, Nathan P.; Srinivasan, Srivilliputhur G.; Lukaszew, Rosa A. // Journal of Applied Physics;Oct2012, Vol. 112 Issue 7, p074328 

    The epitaxial growth of Nb on Cu(111) is experimentally and theoretically investigated at submonolayer level since the early stages of growth for this system remain unexplored despite its interest in superconducting thin film applications. The growth conditions were optimized to obtain...

  • Magnesium oxide as a candidate high-κ gate dielectric. Yan, L.; Lopez, C. M.; Shrestha, R. P.; Irene, E. A.; Suvorova, A. A.; Saunders, M. // Applied Physics Letters;4/3/2006, Vol. 88 Issue 14, p142901 

    Magnesium oxide (MgO) thin films with sharp interfaces were deposited by sputtering of a Mg target on Si. The film stack was characterized using spectroscopic ellipsometry and transmission electron microscopy and the film static dielectric constant (κ) and interface traps were determined. An...

  • Low-noise YBa[sub 2]Cu[sub 3]O[sub 7]-PrBa[sub 2]Cu[sub 3]O[sub 7] multiturn flux transformers. Keene, M.N.; Goodyear, S.W. // Applied Physics Letters;1/17/1994, Vol. 64 Issue 3, p366 

    Examines the construction of epitaxial yridium compound thin film flux transformers with multiturn input coils on magnesium oxide substrates. Use of PrBA[sub 2]Cu[sub 3]O[sub 7] as an insulator; Role of method integration in magnetometer construction; Depiction of low-frequency noise absence in...

  • Modification of critical current density of MgB[sub 2] films irradiated with 200 MeV Ag ions. Shinde, S.R.; Ogale, S.B.; Higgins, J.; Choudhary, R.J.; Kulkarni, V.N.; Venkatesan, T.; Zheng, H.; Ramesh, R.; Pogrebnyakov, A.V.; Xu, S.Y.; Qi Li; Xi, X.X.; Redwing, J.M.; Kanjilal, D. // Applied Physics Letters;3/29/2004, Vol. 84 Issue 13, p2352 

    The effect of 200 MeV Ag ion irradiation on the temperature and field dependence of critical current density (J[sub C]) of high quality MgB[sub 2] thin films is studied. Substantial increase in J[sub C] is observed over a certain field range for the film irradiated at a dose of 10[sup 12]...

  • Demonstration of all in situ magnesium diboride superconductor thin-film tunnel junctions. Tae Hee Kim; Moodera, Jagadeesh S. // Applied Physics Letters;7/19/2004, Vol. 85 Issue 3, p434 

    High-quality planar tunnel junctions of MgB2 superconductor have been fabricated, all in situ, on Si single crystal substrates with Al2O3 as well as MgO barriers. Two superconducting energy gaps due to the σ and π bands of MgB2 have been unambiguously determined from...

  • Comparative Study on Transport and Magnetic Jc of Textured MgB2 Thin Film. Ding, Y.; Lv, H.; Zhang, Y. X.; Shi, Z. X. // Journal of Superconductivity & Novel Magnetism;Aug2010, Vol. 23 Issue 6, p1031 

    Critical current densities of c-axis-oriented MgB2 thin film were measured comparatively by transport and magnetization measurements. Experimental results manifest that transport critical current densities Jct are quite different from magnetic critical current densities Jcm in both quantity and...

  • Pinning Effects in Nb Thin Films with Artificial Pinning Arrays. Cao, R.; Horng, Lance; Wu, J. C.; Yang, T. J.; Wu, T. C. // Journal of Superconductivity & Novel Magnetism;Aug2010, Vol. 23 Issue 6, p1051 

    We summarize some results on the behavior of vortex dynamics and pinning effects in superconducting films with artificial pinning centers. Superconducting thin films with regular arrays of holes were fabricated using electron-beam lithography and reactive dry etching techniques. Vortex dynamics...

  • Nonlinear optical absorption and refraction of epitaxial Ba0.6Sr0.4TiO3 thin films on (001) MgO substrates. Liu, S. W.; Xu, J.; Guzun, D.; Salamo, G. J.; Chen, C. L.; Lin, Y.; Xiao, Min // Applied Physics B: Lasers & Optics;Mar2006, Vol. 82 Issue 3, p443 

    Highly epitaxial Ba0.6Sr0.4TiO3 (BST) ferroelectric thin films were fabricated on (001) MgOsubstrates by pulsed laser deposition. The nonlinear optical absorption coefficients (β) and refraction indices (γ) of the BST thin films on (001) MgO substrates were investigated using the single...

  • Comment on 'Observation of two in-plane epitaxial states in YBa[sub 2]Cu[sub 3]O[sub 7-delta].... Kwok, Hoi S. // Applied Physics Letters;12/2/1991, Vol. 59 Issue 23, p3059 

    Comments on the observation of two in-plane epitaxial states in YBa[sub 2]Cu[sub 3]O[sub 7-delta] films on yttria-stabilized ZrO[sub 2]. Conditions determining the superconducting properties and texture of thin films; Possibility of obtaining an excellent superconducting film with the same...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics