Observation of Josephson plasma in orientation and carrier-controlled YBa2Cu3O7-δ films

A. K. Sarin Kumar; H. Koinuma; M. Iwasaki; X. G. Qiu; Y. Segawa; T. Itoh; M. Kawasaki; E. Saitoh; Y. Tokura

doi:10.1016/S0921-4534(01)00659-1

Observation of Josephson plasma in orientation and carrier-controlled YBa₂Cu₃O_7-δ films

A. K. Sarin Kumar, H. Koinuma, M. Iwasaki, X. G. Qiu, Y. Segawa, T. Itoh, M. Kawasaki, E. Saitoh, Y. Tokura

Research output: Contribution to journal › Article › peer-review

Abstract

In-plane c-axis aligned YBa₂Cu₃O_7-δ(110) has been deposited on SrTiO₃(110) substrates by pulsed laser deposition using a self-template technique. The films were highly crystalline. The oxygen deficiencies of the films were adjusted by controlling the oxygen partial pressure during in situ annealing. We carried out c-axis far-infrared reflectivity measurement on these films and it was found that in the normal state the carriers are confined in the Cu-O planes and their transport along c-axis is incoherent. A pseudogap developed in the normal state at temperatures well above the superconducting transition temperature, T_c, and it persisted in the superconducting state. When the temperature decreased below T_c, coherence is built up for carrier transport along the c-axis and a reflectivity edge associated with Josephson plasma was observed at around 110 cm^-1 (∼14 meV).

Original language	English
Pages (from-to)	134-137
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	362
Issue number	1-4
DOIs	https://doi.org/10.1016/S0921-4534(01)00659-1
Publication status	Published - 2001 Sep
Externally published	Yes

Keywords

Far-infrared spectra
Josephson effect
Pseudo gap
Thin films

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4534(01)00659-1

Cite this

Observation of Josephson plasma in orientation and carrier-controlled YBa₂Cu₃O_7-δ films. / Sarin Kumar, A. K.; Koinuma, H.; Iwasaki, M.; Qiu, X. G.; Segawa, Y.; Itoh, T.; Kawasaki, M.; Saitoh, E.; Tokura, Y.

In: Physica C: Superconductivity and its applications, Vol. 362, No. 1-4, 09.2001, p. 134-137.

Research output: Contribution to journal › Article › peer-review

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title = "Observation of Josephson plasma in orientation and carrier-controlled YBa2Cu3O7-δ films",

abstract = "In-plane c-axis aligned YBa2Cu3O7-δ(110) has been deposited on SrTiO3(110) substrates by pulsed laser deposition using a self-template technique. The films were highly crystalline. The oxygen deficiencies of the films were adjusted by controlling the oxygen partial pressure during in situ annealing. We carried out c-axis far-infrared reflectivity measurement on these films and it was found that in the normal state the carriers are confined in the Cu-O planes and their transport along c-axis is incoherent. A pseudogap developed in the normal state at temperatures well above the superconducting transition temperature, Tc, and it persisted in the superconducting state. When the temperature decreased below Tc, coherence is built up for carrier transport along the c-axis and a reflectivity edge associated with Josephson plasma was observed at around 110 cm-1 (∼14 meV).",

keywords = "Far-infrared spectra, Josephson effect, Pseudo gap, Thin films",

author = "{Sarin Kumar}, {A. K.} and H. Koinuma and M. Iwasaki and Qiu, {X. G.} and Y. Segawa and T. Itoh and M. Kawasaki and E. Saitoh and Y. Tokura",

note = "Funding Information: This work was supported by JSPS Research for the future program in the area of atomic-scale surface and interface dynamics (JSPS-RFTF-96P00205). One of the authors (Sarin Kumar A.K.) would like to thank the Ministry of Education, Science and Culture of Japan for financial support.",

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AU - Segawa, Y.

AU - Itoh, T.

AU - Kawasaki, M.

AU - Saitoh, E.

AU - Tokura, Y.

N1 - Funding Information: This work was supported by JSPS Research for the future program in the area of atomic-scale surface and interface dynamics (JSPS-RFTF-96P00205). One of the authors (Sarin Kumar A.K.) would like to thank the Ministry of Education, Science and Culture of Japan for financial support.

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N2 - In-plane c-axis aligned YBa2Cu3O7-δ(110) has been deposited on SrTiO3(110) substrates by pulsed laser deposition using a self-template technique. The films were highly crystalline. The oxygen deficiencies of the films were adjusted by controlling the oxygen partial pressure during in situ annealing. We carried out c-axis far-infrared reflectivity measurement on these films and it was found that in the normal state the carriers are confined in the Cu-O planes and their transport along c-axis is incoherent. A pseudogap developed in the normal state at temperatures well above the superconducting transition temperature, Tc, and it persisted in the superconducting state. When the temperature decreased below Tc, coherence is built up for carrier transport along the c-axis and a reflectivity edge associated with Josephson plasma was observed at around 110 cm-1 (∼14 meV).

AB - In-plane c-axis aligned YBa2Cu3O7-δ(110) has been deposited on SrTiO3(110) substrates by pulsed laser deposition using a self-template technique. The films were highly crystalline. The oxygen deficiencies of the films were adjusted by controlling the oxygen partial pressure during in situ annealing. We carried out c-axis far-infrared reflectivity measurement on these films and it was found that in the normal state the carriers are confined in the Cu-O planes and their transport along c-axis is incoherent. A pseudogap developed in the normal state at temperatures well above the superconducting transition temperature, Tc, and it persisted in the superconducting state. When the temperature decreased below Tc, coherence is built up for carrier transport along the c-axis and a reflectivity edge associated with Josephson plasma was observed at around 110 cm-1 (∼14 meV).

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