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Magnetic field dependence of the density of states in the multiband superconductor β-Bi2Pd

Author
Herrera, E; Guillamón Gómez, Isabeluntranslated; Galvis, Jose A; Correa, A; Fente, A; Luccas, R. F.; Mompeán, Federico J.; Vieira Díaz, Sebastiánuntranslated; Brison, Jean Pascal; García Hernández, Mar M.; Suderow Rodríguez, Hermann Jesúsuntranslated
Entity
UAM. Departamento de Física de la Materia Condensada
Publisher
American Physical Society
Date
2015-08-17
Citation
10.1103/PhysRevB.92.054507
Physical Review B - Condensed Matter and Materials Physics 92.5 (2015): 054507
 
 
 
ISSN
1550-235X (online); 1098-0121 (print)
DOI
10.1103/PhysRevB.92.054507
Funded by
We wish to acknowledge the support of Departamento Administrativo de Ciencia, Tecnología e Innovacion, COLCIENCIAS (Colombia) Programa Doctorados en el Exterior Convocatoria 568-2012. This work was supported by the Spanish Ministerio de Economía y Competitividad (FIS2011-23488, MAT2011-27470-C02-02, and CSD2009- 00013), by the Comunidad de Madrid through programs NANOFRONTMAG-CM (S2013/MIT-2850) and MAD2DCM (S2013/MIT-3007) and by AXA Research Fund. We also acknowledge SEGAINVEX workshop of UAM, Banco Santander as well as PEOPLE, Graphene Flagship, and NMP programs of EU (Grant Agreements FP7-PEOPLE-2013-CIG 618321, 604391 and Nanopyme FP7-NMP-2012_SMALL- 6 NMP3-SL 2012_310516). Furthermore, we acknowledge European Cooperation in Science and Technology MP1201 action, and discussions with P. Samuely. We are indebted with P. C. Canfield for setting up together with us our growth laboratory and teaching us details about crystal growth
Project
Gobierno de España. FIS2011-23488; Gobierno de España. MAT2011-27470-C02-02; Gobierno de España. CSD2009- 00013; Comunidad de Madrid. S2013/MIT-2850/NANOFRONTMAG; Comunidad de Madrid. S2013/MIT-3007/MAD2DCM; info:eu-repo/grantAgreement/EC/FP7/618321; info:eu-repo/grantAgreement/EC/FP7/ 604391; info:eu-repo/grantAgreement/EC/FP7/310516
Editor's Version
http://dx.doi.org/10.1103/PhysRevB.92.054507
Subjects
Física
URI
http://hdl.handle.net/10486/676196
Rights
©2015 American Physical Society

Abstract

We present very low-temperature scanning tunneling microscopy (STM) experiments on single-crystalline samples of the superconductor β-Bi2Pd. We find a single superconducting gap from the zero-field tunneling conductance. However, the magnetic field dependence of the intervortex tunneling conductance is higher than the one expected in a single-gap superconductor. Such an increase in the intervortex tunneling conductance has been found in superconductors with multiple superconducting gaps. We also find that the hexagonal vortex lattice is locked to the square atomic lattice as expected in crystalline superconductors with anisotropic Fermi surfaces. Moreover, we compare the upper critical field Hc2(T) obtained in our sample with previous measurements and find that Hc2(T) does not increase by reducing the mean free path. We fit Hc2(T) and show that multiband Fermi surface is needed to explain the observed behavior. We propose that β-Bi2Pd is a single-gap multiband superconductor. We anticipate that single-gap superconductivity might often occur in compounds with anisotropic multiband Fermi surfaces
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Google™ Scholar:Herrera, E - Guillamón Gómez, Isabel - Galvis, Jose A - Correa, A - Fente, A - Luccas, R. F. - Mompeán, Federico J. - Vieira Díaz, Sebastián - Brison, Jean Pascal - García Hernández, Mar M. - Suderow Rodríguez, Hermann Jesús

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