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Phys. Rev. B 70, 014519 (2004) [5 pages]

Absence of a boron isotope effect in the magnetic penetration depth of MgB2

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D. Di Castro1,*, M. Angst1, D. G. Eshchenko1,2, R. Khasanov1,2, J. Roos1, I. M. Savić3, A. Shengelaya1, S. L. Bud’ko4, P. C. Canfield4, K. Conder5, J. Karpinski6, S. M. Kazakov6, R. A. Ribeiro4, and H. Keller1
1Physik-Institut der Universität Zürich, CH-8057 Zürich, Switzerland
2Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
3Faculty of Physics, University of Belgrade, 11001 Belgrade, Yugoslavia
4Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
5Laboratory for Neutron Scattering, ETH Zürich and PSI Villigen, CH-5232 Villigen PSI, Switzerland
6Solid State Physics Laboratory, ETH, CH-8093 Zürich, Switzerland

Received 3 May 2004; published 30 July 2004

The magnetic penetration depth λ(0) in polycrystalline MgB2 for different boron isotopes (10B∕11B) was investigated by transverse field muon spin rotation. No boron isotope effect on the penetration depth λ(0) was found within experimental error: Δλ(0)∕λ(0)=0.8(8)%, suggesting that MgB2 is an adiabaic superconductor. This is in contrast to the substantial oxygen isotope effect on λ(0) observed in cuprate high-temperature superconductors.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.014519
DOI:
10.1103/PhysRevB.70.014519
PACS:
74.70.Ad, 71.38.−k, 76.75.+i, 82.20.Tr

*Email address: dicastro@physik.unizh.ch

 
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