Effect of disorder in MgB2 thin films

M. Iavarone, R. Di Capua, A. E. Koshelev, W. K. Kwok, F. Chiarella, R. Vaglio, W. N. Kang, E. M. Choi, H. J. Kim, S. I. Lee, A. V. Pogrebnyakov, Joan Marie Redwing, X. X. Xi

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

We report on scanning tunneling spectroscopy studies of magnesium diboride (MgB2) thin films grown by different techniques. The films have critical temperatures ranging between 28 and 41 K with very different upper critical fields. We find that the superconducting gap associated with the σ band decreases almost linearly with decreasing critical temperature while the gap associated with the π band is only very weakly affected in the range of critical temperatures above 30 K. In the sample with the lowest critical temperature (28 K) we observe a small increase of the π gap that can only be explained in terms of an increase in the interband scattering. The tunneling data was analyzed in the framework of the two-band model. The magnetic-field-dependent tunneling spectra and the upper critical field measurements of these disordered samples can be consistently explained in terms of an increase of disorder that mostly affects the π band in samples with reduced critical temperatures.

Original languageEnglish (US)
Article number214502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number21
DOIs
StatePublished - Jun 1 2005

Fingerprint

critical temperature
disorders
Thin films
thin films
Temperature
Magnesium
magnesium
Spectroscopy
Scattering
Magnetic fields
Scanning
scanning
scattering
magnetic fields
spectroscopy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Iavarone, M., Di Capua, R., Koshelev, A. E., Kwok, W. K., Chiarella, F., Vaglio, R., ... Xi, X. X. (2005). Effect of disorder in MgB2 thin films. Physical Review B - Condensed Matter and Materials Physics, 71(21), [214502]. https://doi.org/10.1103/PhysRevB.71.214502
Iavarone, M. ; Di Capua, R. ; Koshelev, A. E. ; Kwok, W. K. ; Chiarella, F. ; Vaglio, R. ; Kang, W. N. ; Choi, E. M. ; Kim, H. J. ; Lee, S. I. ; Pogrebnyakov, A. V. ; Redwing, Joan Marie ; Xi, X. X. / Effect of disorder in MgB2 thin films. In: Physical Review B - Condensed Matter and Materials Physics. 2005 ; Vol. 71, No. 21.
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Iavarone, M, Di Capua, R, Koshelev, AE, Kwok, WK, Chiarella, F, Vaglio, R, Kang, WN, Choi, EM, Kim, HJ, Lee, SI, Pogrebnyakov, AV, Redwing, JM & Xi, XX 2005, 'Effect of disorder in MgB2 thin films', Physical Review B - Condensed Matter and Materials Physics, vol. 71, no. 21, 214502. https://doi.org/10.1103/PhysRevB.71.214502

Effect of disorder in MgB2 thin films. / Iavarone, M.; Di Capua, R.; Koshelev, A. E.; Kwok, W. K.; Chiarella, F.; Vaglio, R.; Kang, W. N.; Choi, E. M.; Kim, H. J.; Lee, S. I.; Pogrebnyakov, A. V.; Redwing, Joan Marie; Xi, X. X.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 71, No. 21, 214502, 01.06.2005.

Research output: Contribution to journalArticle

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AU - Lee, S. I.

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Iavarone M, Di Capua R, Koshelev AE, Kwok WK, Chiarella F, Vaglio R et al. Effect of disorder in MgB2 thin films. Physical Review B - Condensed Matter and Materials Physics. 2005 Jun 1;71(21). 214502. https://doi.org/10.1103/PhysRevB.71.214502