Photoinduced nanodots and pinning effects in Bi2Sr2CaCu2O8+d

M. Osada; M. Kakihana; H. Yasuoka; M. Käll; L. Börjesson

doi:10.1016/j.physc.2006.04.034

Photoinduced nanodots and pinning effects in Bi₂Sr₂CaCu₂O_8+d

M. Osada^*, M. Kakihana, H. Yasuoka, M. Käll, L. Börjesson

^*Corresponding author for this work

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

Abstract

We report a fabrication of high-density nanodots by photodoping in overdoped Bi₂Sr₂CaCu₂O_8+d thin film (T_c = 80 K). A scanning near-field optical microscope probe is used to locally excite carrier and photodoped region is associated with lower T_c phase (T_c = 75 K) via overdoping. Nanoscale characterizations with optical reflectivity reveal that nanodots (30-nm-diameter) are regularly distributed in 50 nm step. The resultant films with photoinduced nanodots enhance J_c (at least 5 times larger than the initial one), a situation being similar to strong pinning effects observed in films modified by either ion irradiation or sputtered nanoparticles. These results suggest that photoinduced nanodots with lower T_c act as effective pinning centers.

Original language	English
Pages (from-to)	443-446
Number of pages	4
Journal	Physica C: Superconductivity and its Applications
Volume	445-448
Issue number	1-2
DOIs	https://doi.org/10.1016/j.physc.2006.04.034
Publication status	Published - 2006 Oct 1
Externally published	Yes

Keywords

BiSrCaCuO
Nanodots
Photoinduced effect
Pinning effect

ASJC Scopus subject areas

Condensed Matter Physics

Access to Document

10.1016/j.physc.2006.04.034

Cite this

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title = "Photoinduced nanodots and pinning effects in Bi2Sr2CaCu2O8+d",

abstract = "We report a fabrication of high-density nanodots by photodoping in overdoped Bi2Sr2CaCu2O8+d thin film (Tc = 80 K). A scanning near-field optical microscope probe is used to locally excite carrier and photodoped region is associated with lower Tc phase (Tc = 75 K) via overdoping. Nanoscale characterizations with optical reflectivity reveal that nanodots (30-nm-diameter) are regularly distributed in 50 nm step. The resultant films with photoinduced nanodots enhance Jc (at least 5 times larger than the initial one), a situation being similar to strong pinning effects observed in films modified by either ion irradiation or sputtered nanoparticles. These results suggest that photoinduced nanodots with lower Tc act as effective pinning centers.",

keywords = "BiSrCaCuO, Nanodots, Photoinduced effect, Pinning effect",

author = "M. Osada and M. Kakihana and H. Yasuoka and M. K{\"a}ll and L. B{\"o}rjesson",

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T1 - Photoinduced nanodots and pinning effects in Bi2Sr2CaCu2O8+d

AU - Osada, M.

AU - Kakihana, M.

AU - Yasuoka, H.

AU - Käll, M.

AU - Börjesson, L.

PY - 2006/10/1

Y1 - 2006/10/1

N2 - We report a fabrication of high-density nanodots by photodoping in overdoped Bi2Sr2CaCu2O8+d thin film (Tc = 80 K). A scanning near-field optical microscope probe is used to locally excite carrier and photodoped region is associated with lower Tc phase (Tc = 75 K) via overdoping. Nanoscale characterizations with optical reflectivity reveal that nanodots (30-nm-diameter) are regularly distributed in 50 nm step. The resultant films with photoinduced nanodots enhance Jc (at least 5 times larger than the initial one), a situation being similar to strong pinning effects observed in films modified by either ion irradiation or sputtered nanoparticles. These results suggest that photoinduced nanodots with lower Tc act as effective pinning centers.

AB - We report a fabrication of high-density nanodots by photodoping in overdoped Bi2Sr2CaCu2O8+d thin film (Tc = 80 K). A scanning near-field optical microscope probe is used to locally excite carrier and photodoped region is associated with lower Tc phase (Tc = 75 K) via overdoping. Nanoscale characterizations with optical reflectivity reveal that nanodots (30-nm-diameter) are regularly distributed in 50 nm step. The resultant films with photoinduced nanodots enhance Jc (at least 5 times larger than the initial one), a situation being similar to strong pinning effects observed in films modified by either ion irradiation or sputtered nanoparticles. These results suggest that photoinduced nanodots with lower Tc act as effective pinning centers.

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KW - Nanodots

KW - Photoinduced effect

KW - Pinning effect

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