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| Natura: | Artículo científico |
| Lingua: | en |
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Sociedad Mexicana de Física A.C.
2014
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=57031048002 |
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Sommario:
- A numerical calculation of the electronic specific heat for the compound Sr2 RuO4 below its superconducting transition temperature P. Contreras J. Burgos E. Ochoa D. Uzcategui Física, Astronomía y Matemáticas line nodes point nodes gap structure Electronic specific heat unconventional superconductors In this work, a numerical study of the superconducting specific heat of the unconventional multiband superconductor Strontium Ruthenate, Sr2 RuO4 , is performed. Two band gaps models are employed, and the results rendered for each of them are compared. One of the models, previously proposed by one of the authors to explain the experimental temperature behavior of the ultrasound attenuation, considers two gaps with point nodes of different magnitude on different gap surface sheets, while the other one is an isotropic and line node model, reported in the literature for describing quantitatively experimental specific heat data. The Sr2 RuO4 superconducting density of states, DOS, is computed by employing these two models and then, a detailed numerical study of the electronic specific heat, that includes the contribution from the different Fermi sheets, is carried out. It is found that the calculated point node model specific heat temperature behavior shows an excellent agreement with the existent Sr2 RuO4 experimental data at zero field, particularly, it is obtained that the observed specific heat jump at Tc is precisely reproduced. Also, it is found that the sum of the contributions from the different bands fits quantitatively the measured specific heat data. The results in this work evidence that the Sr2 RuO4 superconducting states are of unconventional nature, corresponding to those of a point node superconductor, and show the importance of taking into account the multiband nature of the material when calculating thermodynamic superconducting quantities. 2014 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57031048002 en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.3 Vol.60