Impurity scattering effect on charge transport in high-Tc cuprate junctions
It is known that the zero-bias conductance peak (ZBCP) is expected in tunneling spectra of normal-metal/high-Tc cuprate junctions because of the formation of the midgap Andreev resonant states (MARS) at junction interfaces. In the present review, we report the recent theoretical study of impur...
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2004
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Impurity scattering effect on charge transport in high-Tc cuprate junctions / Y. Tanaka, Y. Asano, S. Kashiwaya // Физика низких температур. — 2004. — Т. 30, № 7-8. — С. 770-784. — Бібліогр.: 137 назв. — англ. |
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Tanaka, Y. Asano, Y. Kashiwaya, S. 2017-06-10T06:48:49Z 2017-06-10T06:48:49Z 2004 Impurity scattering effect on charge transport in high-Tc cuprate junctions / Y. Tanaka, Y. Asano, S. Kashiwaya // Физика низких температур. — 2004. — Т. 30, № 7-8. — С. 770-784. — Бібліогр.: 137 назв. — англ. 0132-6414 PACS: 74.25.Fy, 74.25.Dw, 74.76.Bz https://nasplib.isofts.kiev.ua/handle/123456789/119832 It is known that the zero-bias conductance peak (ZBCP) is expected in tunneling spectra of normal-metal/high-Tc cuprate junctions because of the formation of the midgap Andreev resonant states (MARS) at junction interfaces. In the present review, we report the recent theoretical study of impurity scattering effects on the tunneling spectroscopy. In the former part of the present paper, we discuss impurity effects in normal metal. We calculate tunneling conductance for diffusive normal metal (DN)/high Tc cuprate junctions based on the Keldysh Green's function technique. Besides the ZBCP due to the MARS, we can expect ZBCP caused by the different origin, i.e., the coherent Andreev reflection (CAR) assisted by the proximity effect in DN. Their relative importance depends on the angle α between the interface normal and the crystal axis of high-Tc superconductors. At α = 0, we find the ZBCP by the CAR for low transparent junctions with small Thouless energies in DN; this is similar to the case of diffusive normal metal/insulator/s-wave superconductor junctions. Under increase of α from zero to π/4, the contribution of MARS to ZBCP becomes more prominent and the effect of the CAR is gradually suppressed. Such complex spectral features would be observable in conductance spectra of high-Tc junctions at very low temperatures. In the latter part of our paper, we study impurity effects in superconductors. We consider impurities near the junction interface on the superconductor side. The conductance is calculated from the Andreev and the normal reflection coefficients which are estimated by using the single-site approximation in an analytic calculation and by the recursive Green function method in a numerical simulation. We find splitting of the ZBCP in the presence of the time reversal symmetry. Thus the zero-field splitting of ZBCP in the experiment does not perfectly prove an existence of broken time reversal symmetry state. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Сверхпроводимость и мезоскопические структуры Impurity scattering effect on charge transport in high-Tc cuprate junctions Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Impurity scattering effect on charge transport in high-Tc cuprate junctions |
| spellingShingle |
Impurity scattering effect on charge transport in high-Tc cuprate junctions Tanaka, Y. Asano, Y. Kashiwaya, S. Сверхпроводимость и мезоскопические структуры |
| title_short |
Impurity scattering effect on charge transport in high-Tc cuprate junctions |
| title_full |
Impurity scattering effect on charge transport in high-Tc cuprate junctions |
| title_fullStr |
Impurity scattering effect on charge transport in high-Tc cuprate junctions |
| title_full_unstemmed |
Impurity scattering effect on charge transport in high-Tc cuprate junctions |
| title_sort |
impurity scattering effect on charge transport in high-tc cuprate junctions |
| author |
Tanaka, Y. Asano, Y. Kashiwaya, S. |
| author_facet |
Tanaka, Y. Asano, Y. Kashiwaya, S. |
| topic |
Сверхпроводимость и мезоскопические структуры |
| topic_facet |
Сверхпроводимость и мезоскопические структуры |
| publishDate |
2004 |
| language |
English |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
It is known that the zero-bias conductance peak (ZBCP) is expected in tunneling spectra of
normal-metal/high-Tc cuprate junctions because of the formation of the midgap Andreev resonant
states (MARS) at junction interfaces. In the present review, we report the recent theoretical study
of impurity scattering effects on the tunneling spectroscopy. In the former part of the present paper,
we discuss impurity effects in normal metal. We calculate tunneling conductance for diffusive
normal metal (DN)/high Tc cuprate junctions based on the Keldysh Green's function technique.
Besides the ZBCP due to the MARS, we can expect ZBCP caused by the different origin, i.e., the
coherent Andreev reflection (CAR) assisted by the proximity effect in DN. Their relative importance
depends on the angle α between the interface normal and the crystal axis of high-Tc superconductors.
At α = 0, we find the ZBCP by the CAR for low transparent junctions with small Thouless
energies in DN; this is similar to the case of diffusive normal metal/insulator/s-wave superconductor
junctions. Under increase of α from zero to π/4, the contribution of MARS to ZBCP becomes
more prominent and the effect of the CAR is gradually suppressed. Such complex spectral
features would be observable in conductance spectra of high-Tc junctions at very low temperatures.
In the latter part of our paper, we study impurity effects in superconductors. We consider impurities
near the junction interface on the superconductor side. The conductance is calculated from the
Andreev and the normal reflection coefficients which are estimated by using the single-site approximation
in an analytic calculation and by the recursive Green function method in a numerical simulation.
We find splitting of the ZBCP in the presence of the time reversal symmetry. Thus the
zero-field splitting of ZBCP in the experiment does not perfectly prove an existence of broken time
reversal symmetry state.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/119832 |
| citation_txt |
Impurity scattering effect on charge transport in high-Tc cuprate junctions / Y. Tanaka, Y. Asano, S. Kashiwaya // Физика низких температур. — 2004. — Т. 30, № 7-8. — С. 770-784. — Бібліогр.: 137 назв. — англ. |
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| first_indexed |
2025-12-07T20:35:15Z |
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2025-12-07T20:35:15Z |
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