Services on Demand
Journal
Article
Indicators
- Cited by SciELO
- Access statistics
Related links
- Similars in SciELO
Share
Revista mexicana de física
Print version ISSN 0035-001X
Rev. mex. fis. vol.57 n.5 México Oct. 2011
Investigación
Electronic heat transport for a multiband superconducting gap in Sr2RuO4
P.L. Contreras
Departamento de Física, Universidad De Los Andes, Mérida, 5101, Venezuela.
Recibido el 16 de noviembre de 2010;
aceptado el 9 de agosto de 2011
Abstract
This paper gives a detailed numerical study of the superconducting electronic heat transport in the unconventional multiband superconductor Strontium Ruthenate Sr2RuO4. The study demostrates that a model with different nodal structures on different sheets of the Fermi surface is able to describe quantitatively experimental heat transport data. The contribution of the density of states DOS is given for each sheet of the Fermi surface and the total contribution is also calculated. Finally, a discussion of the universal character of the electronic heat transport in unconventional superconductors and its relation to the DOS based on the type of nodal structure of the superconducting gap in Sr2RuO4 is given.
Keywords: Electronic heat transport; unconventional superconductors; gap structure; superconducting density of states; line nodes; point nodes.
Resumen
En este trabajo se presenta un estudio numérico detallado de la termoconductividad electrónica en el superconductor no convencional Rutenato de Estroncio Sr2RuO4. Se muestra que un modelo con diferentes estructuras nodales en diferentes láminas de la superficie de Fermi es capaz de describir cuantitativamente datos de transporte térmico obtenidos experimentalmente. La densidad de estados se calcula para cada lámina de Fermi y se presenta su contribución total. Por último, se discute el carácter universal de la termoconductividad electrónica en los superconductores no convencionales con diferentes estructuras nodales en la brecha superconductora como es el compuesto Sr2RuO4.
Descriptores: Termoconductividad electrónica; superconductores no convencionales; estructura de la brecha; densidad de estados superconductora; nodos puntuales; líneas de nodos.
PACS: 74.20.Rp; 74.70.Pq; 74.25.F-; 74.25.fc
DESCARGAR ARTÍCULO EN FORMATO PDF
Acknowledgments
I thank Dr. M. Tanatar for stimulating discussions and for providing the experimental data in Fig. 2. I also acknowledge discussions with Prof. Michael Walker from the University of Toronto, Prof. Jose Rodriguez at SUPERCOM from la Universidad de Carabobo, and Prof. Rodrigo Casanova. This research was supported by the Grant CDCHTA number C-1479-07-05-AA.
Referencias
1. Y. Maeno et al., Nature 372 (1994) 532. [ Links ]
2. A. Mackenzie and Y. Maeno, Rev. of Modern Physics 75 (2003) 657. [ Links ]
3. M. Zhitomirsky and T. M. Rice, Phys. Rev. Lett. 87 (2001) 057001. [ Links ]
4. D. Agterberg, T. M. Rice, and M. Sigrist, Phys. Rev. Lett. 78 (1997) 3374. [ Links ]
5. M. J. Graf and A. V. Balatsky, Phys. Rev. B 62 (2000) 9697. [ Links ]
6. W. C. Wu and R. Joynt, Phys. Rev. B65 (2002) 104502-1. [ Links ]
7. K. I. Wysokinski, G. Litak, J. F. Annett, and B. L. Gyorffy, Phys. Stat. Sol (b) 236 (2003) 325. [ Links ]
8. Y. Hasegawa, K. Machida, and M. Ozaki, J. Phys. Soc. Jpn. 69 (2000) 336. [ Links ]
9. K. Deguchi, Z. Q. Mao, H. Yaguchi, and Y. Maeno, Phys. Rev. Lett. 92 (2000) 047002-1-4. [ Links ]
10. M. Tanatar, S. Nagai, Z. Q. Mao, Y. Maeno, and T. Ishiguro, Phys. Rev. B63 (2001) 064505. [ Links ]
11 . C. Lupien, W. A. MacFarlane, C. Proust, L. Taillefer, Z. Q. Mao, and Y. Maeno, Phys. Rev. Lett. 86 (2001) 5986. [ Links ]
12. P. Contreras, M. Walker, and K. Samokhin, Phys. Rev. B 70 (2004) 184528. [ Links ]
13. T. M. Rice and M. Sigrist, J. Phys. Condens. Matter 7 (1995) L643. [ Links ]
14. G. M. Luke etal., Nature 394, (1998) 558. [ Links ]
15. M. Walker and P. Contreras, Phys. Rev. B66 (2002) 214508. [ Links ]
16. C. Bergemann, A. P. Mackenzie, S. R. Julian, D. Forsythe, and E. Omichi, Adv. Phys. 53 (2003) 639. [ Links ]
17. I.I. Mazin and D. J. Singh, Phys. Rev. Lett. 79 (1997) 733. [ Links ]
18. M. Walker, M. Smith, and K. Samokhin, Phys. Rev. B65 (2002) 014517. [ Links ]
19. V. P. Mineev and K. V. Samokhin, Introduction to Unconventional Superconductivity (Gordon and Breach, Amsterdam, 1999). [ Links ]
20. M. Zhitomirsky and M. Walker, Phys. Rev. B57 (1998) 8560. [ Links ]
21. S. Schmitt-Rink, K. Miyake, and C. M. Varma, Phys. Rev. Lett. 57 (1986) 2575. [ Links ]
22. M. Tanatar, M. Suzuki, S. Nagai, Z. Q. Mao, Y. Maeno, and T. Ishiguro, Phys. Rev. Lett. 86 (2001) 2649. [ Links ]
23. M. Suzuki, M. Tanatar, N. Kikugawa, Z. Q. Mao, Y. Maeno, and T. Ishiguro, Phys. Rev. Lett. 88 (2002) 227004. [ Links ]