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Point-contact Andreev-reflection spectroscopy in anisotropic superconductors: the importance of directionality (Review Article)
Репозиторій DSpace/Manakin
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Point-contact Andreev-reflection spectroscopy in anisotropic superconductors: the importance of directionality (Review Article)
Тема:
К 75-летию со дня рождения И. К. Янсона
Інший ID:
PACS: 74.45.+c, 74.70.–b, 74.20.Rp
Посилання:
Point-contact Andreev-reflection spectroscopy
in anisotropic superconductors: the importance
of directionality
(Review Article) / D. Daghero, M. Tortello, P. Pecchio, V.A. Stepanov, R.S. Gonnelli // Физика низких температур. — 2013. — Т. 39, № 3. — С. 261–275. — Бібліогр.: 52 назв. — англ.
Підтримка:
We acknowledge the financial support of the European
Community through to the Collaborative EU-Japan Project
“IRON SEA” (NMP3-SL-2011-283141), and of the Italian
Ministry of Research through the PRIN Project N.
2008XWLWF9-005. Our warmest thanks to all the people
who contributed to the research summarized in this paper:
G.A. Ummarino, S. Galasso, G. Profeta for help in theoretical
analysis and bandstructure calculations; J. Karpinski,
N.D. Zhigadlo, Z. Bukowski, J. Jiang, J.S. Kim, K. Iida
and F. Kurth for providing us with crystals and films used
for PCARS measurements. RSG acknowledges R.K. Kremer
and the Max Planck Institute for Solid State Research
in Stuttgart, where the measurements on Ca(Fe,Co)2As2
were carried out.
Дата:
2013
Переглядів:
735
Завантажень:
837
Анотація:
Point-contact Andreev-reflection spectroscopy (PCARS) has demonstrated to be one of the most effective experimental
tools for the investigation of fundamental properties of superconductors such as the superconducting
gap and the electron–phonon (or, more generally, electron–boson) coupling. By reviewing relevant examples reported
in literature and presenting new results, in this paper we show that when the direction of the interface with
respect to the crystallographic axes can be controlled (as in single crystals and epitaxial films) PCARS can provide
invaluable information about the anisotropy of the pairing wavefunction or — in the case of multiband superconductors
— on the number, amplitude and symmetry of the energy gaps. Moreover, the analysis of PCARS
results within a suitable 3D generalization of the BTK model allows obtaining qualitative information about the
topology of the Fermi surface.
