Properties of tunnel junctions with [103]YBa/sub 2/Cu/sub 3/O/sub y//SrTiO/sub 3//[013]YBa/sub 2/Cu/sub 3/O/sub y/ layered structure

Matsui, Toshiyuki; Suzuki, Takeshi; Kimura, Hiroshi; Yamaguchi, D.; Ueda, Atsushi; Kamijo, Hiroshi

doi:10.1109/77.403065

Cited by 2 publications

(1 citation statement)

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“…The presence of these zero-bias anomalies ͑ZBA͒ has been reported in point contact 10 and scanning tunneling microscopy ͑STM͒ measurements 11 as well as in film-oriented YBa 2 Cu 3 O 7 junctions. [12][13][14] Splitting of the low-energy peak has been observed in magnetic fields of a few tesla or in zero field at low temperatures. 15 Recently, one of the authors of the present study ͑A.M.C.͒ has discussed the different behavior of the ZBCP due to unconventional symmetry of the superconducting order parameter or to Kondo-type scattering from isolated magnetic moments at the tunnel barrier.…”

Section: Introductionmentioning

confidence: 97%

Effects of quasiparticle bound states in the tunneling characteristics ofYBa2Cu3O
Cucolo
¹
,
Bobba
²
,
Akimenko
³

2000
Phys. Rev. B
10
2
7
0
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By carefully adjusting the distance between the two fractured electrodes, we have investigated the in-plane conductance characteristics of YBa 2 Cu 3 O 7 break junctions in different tunneling regimes. In the q-p regime we have found that the conductance spectra strongly depend on the misorientation angle between the tunneling current and the YBa 2 Cu 3 O 7 crystal axis. When the tunneling current along the a-a or b-b axis was favored, conductance maxima and shoulders around Ϯ40 and Ϯ 20 mV have been measured at low temperatures. For different misorientation angles, we have found the presence of a zero bias conductance peak ͑ZBCP͒ that develops at the junction T c as well as gap related structures at about Ϯ 20 mV. The amplitude of the ZBCP diverges as 1/T for temperatures below 40 K. All these features are consistent with a d-wave model for the high-T c superconductors.

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Section: Introductionmentioning

confidence: 97%

Effects of quasiparticle bound states in the tunneling characteristics ofYBa2Cu3O
Cucolo
¹
,
Bobba
²
,
Akimenko
³

2000
Phys. Rev. B
10
2
7
0
View full text Add to dashboard Cite

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Transport properties of ultrathin SrTiO3 barriers for high-temperature superconductor electronics applications

Morán

Hott

Schneider

et al. 2003

Journal of Applied Physics

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Current transport through ultrathin SrTiO3 (STO) barriers has been studied systematically with respect to its dependence on barrier thickness d=2–30 nm, temperature T, and voltage V in state-of-the-art planar YBa2Cu3O7−x/SrTiO3/Au (YBCO/STO/Au) heterojunctions with c-axis oriented YBCO layer. We identified different transport regimes: Elastic tunneling was observed for samples with a nominal barrier thickness of 2 nm, which represents our experimental minimum for obtaining insulating transport characteristics. Already for slightly thicker STO barriers, resonant tunneling and hopping via a small number of localized states begins to dominate the transport behavior. For d>20 nm, a crossover to variable range hopping behavior is observed in the high-bias voltage regime as well as in the high temperature regime. A localization length of ∼0.46 nm indicating the spread of the localized states can be derived from these experiments. This value is close to the STO lattice constant and corresponds to a high density of localized states of nL∼6×1019(eV)−1 cm−3. In a free electron tunneling model, this corresponds to an average tunnel barrier height of ∼0.4 eV.

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Properties of tunnel junctions with [103]YBa/sub 2/Cu/sub 3/O/sub y//SrTiO/sub 3//[013]YBa/sub 2/Cu/sub 3/O/sub y/ layered structure

Cited by 2 publications

References 5 publications

Effects of quasiparticle bound states in the tunneling characteristics ofYBa2Cu3O
Cucolo
¹
,
Bobba
²
,
Akimenko
³

2000
Phys. Rev. B
10
2
7
0
View full text Add to dashboard Cite

Effects of quasiparticle bound states in the tunneling characteristics ofYBa2Cu3O
Cucolo
¹
,
Bobba
²
,
Akimenko
³

2000
Phys. Rev. B
10
2
7
0
View full text Add to dashboard Cite

Transport properties of ultrathin SrTiO3 barriers for high-temperature superconductor electronics applications

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Properties of tunnel junctions with [103]YBa/sub 2/Cu/sub 3/O/sub y//SrTiO/sub 3//[013]YBa/sub 2/Cu/sub 3/O/sub y/ layered structure

Cited by 2 publications

References 5 publications

Effects of quasiparticle bound states in the tunneling characteristics ofYBa2Cu3OCucolo1, Bobba2, Akimenko3 2000Phys. Rev. B10270View full textAdd to dashboardCite

Effects of quasiparticle bound states in the tunneling characteristics ofYBa2Cu3OCucolo1, Bobba2, Akimenko3 2000Phys. Rev. B10270View full textAdd to dashboardCite

Transport properties of ultrathin SrTiO3 barriers for high-temperature superconductor electronics applications

Contact Info

Product

Resources

About

Effects of quasiparticle bound states in the tunneling characteristics ofYBa2Cu3O
Cucolo
¹
,
Bobba
²
,
Akimenko
³

2000
Phys. Rev. B
10
2
7
0
View full text Add to dashboard Cite

Effects of quasiparticle bound states in the tunneling characteristics ofYBa2Cu3O
Cucolo
¹
,
Bobba
²
,
Akimenko
³

2000
Phys. Rev. B
10
2
7
0
View full text Add to dashboard Cite