Terahertz Spectroscopy of Superconductors

Abstract:

We show how synchrotron radiation (SR) in the terahertz (THz) region provides the possibility to measure the properties of conventional and exotic superconductors in their superconducting state. Indeed, through the coupling of SR and a conventional Michelson interferometer, one can obtain in the THz range a signal-to-noise ratio up to 103. We review the application of this technique to superconductors with a different degree of complexity: the single-gap boron-doped diamond BCS isotropic material; CaAlSi, a superconductor isostructural to MgB2 with a slight anisotropy between the gap in the hexagonal planes and that along the orthogonal c axis; and isotropic V3Si, where superconductivity opens two gaps at the Fermi energy.

• Periodical: Advances in Science and Technology (Volume 75)
• Pages: 147-154
• DOI: https://doi.org/10.4028/www.scientific.net/AST.75.147
• Online since: October 2010
• Authors: Stefano Lupi, Leonetta Baldassarre, Paolo Calvani, Paolo Dore, Chiara Mirri, Michele Ortolani, Andrea Perucchi
• Keywords: Superconductivity, Terahertz Spectroscopy

References

[1] Y. Takano, M. Nagao, I. Sakaguchi, M. Tachiki, T. Hatano, K. Kobayashi, H. Umezawa and H. Kawarada, Appl. Phys. Lett. 85 (2004) p.2851.

DOI: 10.1063/1.1802389

[2] A. K. Ghosh, M. Tokunaga, and T. Tamegai, Phys. Rev. B68 (2003) p.054507.

[3] D.N. Basov, S.V. Dordevic, E.J. Singley, W.J. Padilla, K. Burch, J.E. Elenewski, L.H. Greene, J. Morris and R. Schickling, Rev. Sci. Instrum. 74 (2003) p.4703.

DOI: 10.1063/1.1614855

[4] M. Ortolani, P. Calvani, S. Lupi, U. Schade, A. Perla, M. Fujita, and K. Yamada, Phys. Rev. B. 73 (2006) p.184508.

[5] M. Abo-Bakr, J. Feikes, K. Holldack, P. Kuske, W.B. Peatman, U. Schade, G. Wustefeld and H. -W. Hubers , Phys. Rev. Lett. 90 (2003) p.094801.

DOI: 10.1103/physrevlett.90.094801

[6] S. Lupi, A. Nucara, A. Perucchi, P. Calvani, M. Ortolani, L. Quaroni, and M. Kiskinova, JOSA B24, (2007) p.959.

DOI: 10.1364/josab.24.000959

[7] T. Yokoya, T. Nakamura, T. Matsushita, T. Muro, Y. Takano, M. Nagao, T. Takenouchi, H. Kawarada and T. Oguchi, Nature 438, (2005) p.647.

DOI: 10.1038/nature04278

[8] W. Zimmermann, E.H. Brandt, M. Bauer, E. Seider and L. Genzel, Physica C 183, (1991) p.99.

[9] R. Prozorov, T. A. Olheiser, R. W. Giannetta, K. Uozato, and T. Tamegai, Phys. Rev. B 73, (2006) p.184523.

[10] S. Tsuda, T. Yokoya, S. Shin, M. Imai, and I. Hase, Phys. Rev. B69, (2004) p.100506(R).

[11] S. Kuroiwa, H. Takagiwa, M. Yamazawa, J. Akimitsu, K. Ohishi1, A. Koda, W. Higemoto and R. Kadono, J. Phys. Soc. Japan. 73, (2004) p.2631.

DOI: 10.1143/jpsj.73.2631

[12] I.I. Mazin, and V.P. Antropov, Physica C 385, (2003) p.49.

[13] J. Kortus, I.I. Mazin, K.D. Belashchenko, V.P. Antropov, and L.L. Boyer, Phys. Rev. Lett. 86, (2001) p.4656.

[14] A. Perucchi, D. Nicoletti, M. Ortolani,  C. Marini, R.  Sopracase, S. Lupi,  U. Schade, M. Putti, I. Pallecchi, C. Tarantini, M. Ferretti, C. Ferdeghini, M. Monni, F. Bernardini, S. Massidda, P. Dore, Phys. Rev. B 81, (2010) p.092509.

DOI: 10.1103/physrevb.81.092509

[15] Y. A. Nefyodov, A. M. Shuvaev, and M. R. Trunin, EPL 72, 638_(2005).

[16] J. E. Sonier, F. D. Callaghan, R. I. Miller, E. Boaknin, L. Taillefer, R. F. Kiefl, J. H. Brewer, K. F. Poon, and J. D. Brewer, Phys. Rev. Lett. 93, 017002 _(2004).

[17] C. Ferdeghini, E. Bellingeri, C. Fanciulli, M. Ferretti, P. Manfrinetti, I. Pallecchi, M. Putti, C. Tarantini, M. Tropeano, A. Andreone, G. Lamura, and R. Vaglio, IEEE Trans. on Appl. Supercond. 19, (2009) p.2849.

DOI: 10.1109/tasc.2009.2019209