Abstract
Magnesium diboride has been thermally treated in the presence of Rb, Cs, and Ba. The magnetic susceptibility shows the possible onsets of superconductivity in the resulting samples at 52 K (Rb), 58 K (Cs), and 45 K (Ba). Room-temperature 11B NMR indicates the cubic symmetry of the electric field gradient at the boron site for the samples reacted with Rb and Cs, in contrast to the axial symmetry in the initial MgB2 and in the sample treated with Ba.
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J. Nagamatsu, N. Nakagawa, T. Muranaka, et al., Nature 401, 63 (2001).
J. Kortus, I. I. Mazin, K. D. Belashchenko, et al., Phys. Rev. Lett. 86, 4656 (2001).
I. I. Mazin and V. P. Antropov, Physica C (Amsterdam) 86, 49 (2003).
T. Takenoby, T. Ito, D. H. Chi, et al., Phys. Rev. Lett. 64, 134513 (2001).
Y. G. Zhao, X. P. Zhang, P. T. Qiao, et al., Physica C (Amsterdam) 361, 91 (2001).
M. R. Cimberle, M. Novak, P. Manifrinetti, and A. Palenzona, cond-mat/0105212 (2001).
I. Felner, Physica C (Amsterdam) 353, 11 (2001).
S. M. Kazakov, M. Angest, J. Karpinski, et al., Solid State Commun. 119, 1 (2001).
J. S. Slusky, N. Rogado, K. A. Regan, et al., Nature 410, 343 (2001).
Y. Zhao, Y. Feng, C. H. Cheng, et al., Appl. Phys. Lett. 79, 1154 (2001).
Y. Moritomo and S. Xu, cond-mat/0104568 (2001).
Y. Moritomo, K. Kato, and A. Nakamura, J. Phys. Soc. Jpn. 70, 1889 (2001).
The curves shown in Fig. 1 are reproducible and retain their shapes after a tenfold increase of the modulation frequency. Therefore, the anomalies on the curves are not experimental artefacts but are related to the ac magnetic response of the samples. The response is diamagnetic upon cooling and its size is comparable with that of the reference sample (curve 1 in Fig. 1). Since no other transitions except the superconducting one are known to give diamagnetic response of this size, the observed anomalies have to be attributed to superconductivity.
A. Gerashenko, K. Mikhalev, S. Verkhovskii, et al., Appl. Magn. Reson. 21, 157 (2001).
S. H. Baek, B. J. Suh, E. Pavarini, et al., Phys. Rev. B 66, 104510 (2002).
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Palnichenko, A.V., Vyaselev, O.M. & Sidorov, N.S. Influence of Rb, Cs, and Ba on the superconductivity of magnesium diboride. Jetp Lett. 86, 272–274 (2007). https://doi.org/10.1134/S0021364007160126
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DOI: https://doi.org/10.1134/S0021364007160126