Quasiparticle-injection effect in YBa2Cu3Ox-based planar structures

Boguslavskij, Y.M.; Joosse, K.; Roesthuis, F.J.G.; Gerritsma, G.J.; Rogalla, Horst

doi:10.1016/0921-4526(94)90372-7

Cited by 5 publications

(4 citation statements)

References 2 publications

(3 reference statements)

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“…[126]. Therefore, the current summation conjecture remains unsubstantiated, contrary to the assertion in Ref.…”

Section: "Current Summation"contrasting

confidence: 54%

“…[126] gave rise to a branch imbalance effect associated with the injection of charged quasiparticles [45], as discussed in Chapter 2. That is, reversing the polarity of the injection gate current actually changed the injected quasiparticles from predominately electron-like to hole-like in character, or vice versa.…”

Section: "Current Summation"mentioning

confidence: 99%

“…In an earlier study of an N-I-S heterostructure [126,127], a suppression of J + c obtained was attributed to the effect of current summation in Ref. [125].…”

Section: "Current Summation"mentioning

confidence: 99%

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Spin-polarized quasiparticle transport in cuprate superconductors

Huang

Yeh

2002

Phys. Rev. B

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The effects of spin-polarized quasiparticle transport in superconducting YBa 2 Cu 3 O 7Ϫ␦ ͑YBCO͒ epitaxial films are investigated by means of current injection into perovskite ferromagnet-insulator-superconductor ͑F-I-S͒ heterostructures. These effects are compared with the injection of simple quasiparticles into control samples of perovskite nonmagnetic metal-insulator-superconductor ͑N-I-S͒. Systematic studies of the critical current density (J c ) as a function of the injection current density (J in j ), temperature (T), and the thickness ͑d͒ of the superconductor reveal drastic differences between the F-I-S and N-I-S heterostructures, with strong suppression of J c and a rapidly increasing characteristic transport length near the superconducting transition temperature T c only in the F-I-S samples. The temperature dependence of the efficiency (ϵ⌬J c /J in j ; ⌬J c : the suppression of critical current due to finite J in j ͒ in the F-I-S samples is also in sharp contrast to that in the N-I-S samples, suggesting significant redistribution of quasiparticles in F-I-S due to the longer lifetime of spin-polarized quasiparticles. Application of conventional theory for nonequilibrium superconductivity to these data further reveal that a substantial chemical potential shift * in F-I-S samples must be invoked to account for the experimental observation, whereas no discernible chemical potential shift exists in the N-I-S samples, suggesting strong effects of spin-polarized quasiparticles on cuprate superconductivity. The characteristic times estimated from our studies are suggestive of anisotropic spin relaxation processes, possibly with spin-orbit interaction dominating the c-axis spin transport and exchange interaction prevailing within the CuO 2 planes. Several alternative scenarios attempted to account for the suppression of critical currents in F-I-S samples are also critically examined, and are found to be neither compatible with experimental data nor with the established theory of nonequilibrium superconductivity.

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“…[126]. Therefore, the current summation conjecture remains unsubstantiated, contrary to the assertion in Ref.…”

Section: "Current Summation"contrasting

confidence: 54%

Section: "Current Summation"mentioning

confidence: 99%

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Spin-polarized quasiparticle transport in cuprate superconductors

Huang

Yeh

2002

Phys. Rev. B

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“…If one could prepare continuous PBCO barriers thinner than the average hopping length of about 6 For all devices using PBCO on (001)-oriented "20, the current gain was less than one at the lowest temperature measured. The same was observed for a 3 nm thick PBCO barrier on (100) YBCO and for 5 nm thick Ga-doped PBCO barriers on (001)-oriented YBCO (see Figure 4).…”

Section: Pbco and Ga-doped Pbco Barriermentioning

confidence: 92%

Material aspects for preparing HTS quasiparticle injection devices

Schneider

Moerman

Roesthuis

et al. 1997

IEEE Trans. Appl. Supercond.

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Quasiparticle (QP) injection devices based on HTS could play an important role in future superconducting applications if material aspects can be better controlled. One reason why this kind of device received little attention in the past is the lack of an appropriate barrier for QP tunnelling. In a series of experiments, we used different barriers to test if they are suitable, i. e. if a current and possibly a voltage gain can be achieved. We improved the performance of planar YBCOhatural barrierlAu devices and a current gain of more than 6 at 40K was observed. Most devices, however, showed signs of heating effects. Another barrier material was SrTiQ, with layers of 5 -6 nm thickness. Current-voltage characteristics showed that the barriers were continuous and we observed current gains of up to 3 at 60 K. PrBa2Cu3O7., is an interesting candidate if one could overcome the problem of resonant inelastic tunnelling for QP. In a series of experiments we demonstrated that, even for 3 nm thin PBCO barriers on a-and c-axis oriented YBazCus07.,, most devices showed at best a current gain of 1. However, we have indications that a current gain of 10 could be possible with unity voltage gain.

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Three-terminal Devices

Mannhart¹,

Hilgenkamp²

2001

Encyclopedia of Materials: Science and Technology

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Quasiparticle-injection effect in YBa2Cu3Ox-based planar structures

Cited by 5 publications

References 2 publications

Spin-polarized quasiparticle transport in cuprate superconductors

Spin-polarized quasiparticle transport in cuprate superconductors

Material aspects for preparing HTS quasiparticle injection devices

Three-terminal Devices

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