Anisotropy and critical current density of MgB2 thin films grown in-situ by molecular beam epitaxy

W. Jo, M. R. Beasley, R. H. Hammond

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations


We report transport properties of superconducting MgB2 thin films in-situ grown by molecular beam epitaxy. The MgB2 films show a superconducting transition at 34.5 K with δTc < 1 K. We measure the in-plane electrical resistivity of the films in magnetic field to 8 T and estimate the upper critical field Hc2(0) ∼ 32 T for field oriented along the c-axis and Hc2(0) ∼ 35 T in the plane of the film. We find the zero-temperature coherence lengths ξc(0) ∼ 31 Å and ξab(0) ∼ 36 Å, indicating the field anisotropy ratio is 1.2, comparable with reported in-situ epitaxial thin films, but less than single crystals. The calculated electronic mean free path l = 25 Å is smaller than the coherence length, which places our films in the dirty limit. Estimates of the critical current density, Jc, using magnetic field hysteresis loops and the Bean critical state model give nominal critical current densities on the order of 106 A/cm2 at 15 K and self-field.

Original languageEnglish
Pages (from-to)3257-3260
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2 III
StatePublished - Jun 2003
Event2002 Applied Superconductivity Conference - Houston, TX, United States
Duration: 4 Aug 20029 Aug 2002

Bibliographical note

Funding Information:
Manuscript received August 5, 2002. This work was supported by the Air Force Office of Scientific Research under Grant F49620-01-0103. The authors are with Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305-4045 USA (e-mail: [email protected]; [email protected]; [email protected]). Digital Object Identifier 10.1109/TASC.2003.812216


  • Anisotropy of coherence length
  • Critical current density
  • In-situ growth
  • MgB thin films
  • Molecular beam epitaxy


Dive into the research topics of 'Anisotropy and critical current density of MgB2 thin films grown in-situ by molecular beam epitaxy'. Together they form a unique fingerprint.

Cite this