Thermoelectric Power of MgB_2 Single Crystals Doped with Holes and Electrons

• Authors: K. Oganisian , K. Rogacki , C. Sulkowski , N. Zhigadlo , S. Katrych , J. Karpinski
• Languages of publication: EN

Abstracts

EN

The thermoelectric power of MgB_2 single crystals, non-substituted, single-substituted with C, and co-substituted with C and Li, was investigated in the temperature range from 10 to 300 K. Both the in-plane (S_ab) and the out-of-plane (S_c) thermoelectric powers are positive for non-substituted crystals and both S_ab and S_c change a sign for crystals doped with electrons when C is substituted for B in the amount larger than 6 at.%. The substitution of C, which supplies electrons mainly into the σ band, reduces the thermoelectric power anisotropy, most likely by increasing the interband scattering. When Li is additionally co-substituted for Mg, S_ab remains unchanged but S_c increases substantially. The Li substitution donates holes into the π band rather than into the σ band and in this way modifies the π band properties, including the possible increase in the intraband scattering.

Keywords

EN

74.25.Fy; 74.70.Ad; 74.62.Dh

Discipline

• 74.62.Dh: Effects of crystal defects, doping and substitution(for specific crystal defects, see 61.72.-y)
• 74.70.Ad: Metals; alloys and binary compounds (including A15, MgB2, etc.)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 114
• Issue: 1
• Pages: 191-195

Dates

published

2008-07

received

2007-11-06

Contributors

author

K. Oganisian

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland

author

K. Rogacki

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland

author

C. Sulkowski

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland

author

N. Zhigadlo

• Laboratory for Solid State Physics, ETH, 8093 Zurich, Switzerland

author

S. Katrych

• Laboratory for Solid State Physics, ETH, 8093 Zurich, Switzerland

author

J. Karpinski

• Laboratory for Solid State Physics, ETH, 8093 Zurich, Switzerland

References

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Identifiers

DOI

10.12693/APhysPolA.114.191