Effect of Magnetic Impurities in a Two-Band Superconductor: A Point-Contact Study of Mn-Substituted MgB₂ Single Crystals

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R. S. Gonnelli,¹ D. Daghero,¹ G. A. Ummarino,¹ A. Calzolari,¹ M. Tortello,¹ V. A. Stepanov,² N. D. Zhigadlo,³ K. Rogacki,³ J. Karpinski,³ F. Bernardini,⁴ and S. Massidda⁴
¹Dipartimento di Fisica and CNISM, Politecnico di Torino, 10129 Torino, Italy
²P.N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia
³Laboratory for Solid State Physics, ETHZ, CH-8093 Zurich, Switzerland
⁴Dipartimento di Fisica, Università di Cagliari, 09042 Monserrato (CA), Italy

Received 12 October 2005; published 19 July 2006

Wepresent the first results of directional point-contact measurements in Mg_1-xMn_xB₂single crystals, with x up to 0.015 and bulk T_cdown to 13.3 K. The order parameters Delta and Delta wereobtained by fitting the conductance curves with the two-band Blonder-Tinkham-Klapwijkmodel. Both Delta and Delta decrease with the critical temperatureof the junctions T <sub>c</sub><sup>A</sup> , but remain clearly distinct up tothe highest Mn content. Once analyzed within the Eliashberg theory,the results indicate that spin-flip scattering is dominant in the sigma band, as also confirmed by first-principles band-structure calculations.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.97.037001
DOI:	10.1103/PhysRevLett.97.037001
PACS:	74.50.+r; 74.45.+c; 74.70.Ad 74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects in superconductors 74.45.+c Proximity effects; Andreev effect; SN and SNS junctions 74.70.Ad Superconducting metals; alloys and binary compounds (including A15, MgB₂, etc.) YEAR: 2006

REFERENCES (18)

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A. Y. Liu, I. I. Mazin, and J. Kortus, Phys. Rev. Lett. 87, 087005 (2001);
A. Brinkman et al., Phys. Rev. B 65, 180517(R) (2002);

Phys. Rev. B 66, 054524 (2002)

K. Rogacki et al., Phys. Rev. B 73, 174520 (2006).
R. S. Gonnelli et al., Phys. Rev. Lett. 89, 247004 (2002).
R. S. Gonnelli et al., Phys. Rev. B 69, 100504(R) (2004).
G. E. Blonder, M. Tinkham, and T. M. Klapwijk, Phys. Rev. B 25, 4515 (1982).
Goutam Sheet, S. Mukhopadhyay, and P. Raychaudhuri, Phys. Rev. B 69, 134507 (2004).
E. Schachinger and J. P. Carbotte, Phys. Rev. B 29, 165 (1984).
C. P. Moca and C. Horea, Phys. Rev. B 66, 052501 (2002).
J. Kortus et al., Phys. Rev. Lett. 94, 027002 (2005).
O. V. Dolgov et al., Phys. Rev. B 72, 024504 (2005).

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Phys. Rev. Lett. 97, 037001 (2006) [4 pages]

Effect of Magnetic Impurities in a Two-Band Superconductor: A Point-Contact Study of Mn-Substituted MgB2 Single Crystals

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Effect of Magnetic Impurities in a Two-Band Superconductor: A Point-Contact Study of Mn-Substituted MgB₂ Single Crystals