Bo Chen et al 2006 New J. Phys. 8 274 doi:10.1088/1367-2630/8/11/274
Anisotropy and penetration depth of MgB2 from 11B NMR
Bo Chen1, Pratim Sengupta1, W P Halperin1, E E Sigmund2, V F Mitrović3, M H Lee4, K H Kang4, B J Mean4, J Y Kim5 and B K Cho5
Show affiliationsThe 11B NMR spectra in polycrystalline MgB2 were measured for several magnetic fields (1.97 and 3.15 T) as a function of temperature from 5 to 40 K. The composite spectra in the superconducting state can be understood in terms of anisotropy of the upper critical field, γH, which is determined to be 5.4 at low temperature. Using Brandt's algorithm (Brandt 1997 Phys. Rev. Lett. 78 2208) the full spectrum, including satellites, was simulated for the temperature 8 K and a magnetic field of 1.97 T. The penetration depth λ was determined to be 1152 ± 50 Å, and the anisotropy of the penetration depth, γλ, was estimated to be close to one at low temperature. Therefore, our findings establish that there are two different anisotropies for upper critical field and penetration depth at low temperatures.
- PACS
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76.60.-k Nuclear magnetic resonance and relaxation
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
- Subjects
- Dates
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Issue 11 (November 2006)
Received 23 October 2006
Published 16 November 2006
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Anisotropy and penetration depth of MgB2 from 11B NMR
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