Observation of compositional fluctuation by scanning superconducting quantum interference device (SQUID) microscope in superconducting La 1.8Sr0.2CuO4

Junpei Kasai; Noriaki Okazaki; Tetsuya Hasegawa; Yoshihiko Togawa; Takao Sasagawa; Jun Ichi Shimoyama; Kohji Kishio; Makoto Ohtani; Tomoteru Fukumura; Masashi Kawasaki; Hideomi Koinuma

doi:10.1143/JJAP.43.L1327

Observation of compositional fluctuation by scanning superconducting quantum interference device (SQUID) microscope in superconducting La _1.8Sr_0.2CuO₄

Junpei Kasai, Noriaki Okazaki, Tetsuya Hasegawa, Yoshihiko Togawa, Takao Sasagawa, Jun Ichi Shimoyama, Kohji Kishio, Makoto Ohtani, Tomoteru Fukumura, Masashi Kawasaki, Hideomi Koinuma

SCI - Chemistry

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

2 Citations (Scopus)

Abstract

In order to visualize spatial distributions of vortices strongly pinned in La_1.8Sr_0.2CuO₄, we have performed scanning superconducting quantum interference device (SQUID) microscopic (SSM) measurements near T_C. The obtained SSM images have revealed that stripe-shaped regions with higher T_c run in an arbitrary direction with respect to crystallographic axes. Vortices tend to align in a one-dimensional fashion, negotiating around the higher T_c regions. High-resolution electron probe micro-analysis confirmed that the spatial variation in T_c corresponds well to the modulation of Sr/La composition. We also found that small-angle grain boundaries with tilt angles of 1-3 degrees are less effective in trapping vortices, indicating that superconductivity is not degraded very much.

Original language	English
Pages (from-to)	L1327-L1329
Journal	Japanese Journal of Applied Physics, Part 2: Letters
Volume	43
Issue number	10 B
DOIs	https://doi.org/10.1143/JJAP.43.L1327
Publication status	Published - 2004 Oct 15

Keywords

Compositional fluctuation
LaSr CuO
Overdoped regime
Pinning state
Scanning SQUID microscope

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/JJAP.43.L1327

Cite this

Kasai, J., Okazaki, N., Hasegawa, T., Togawa, Y., Sasagawa, T., Shimoyama, J. I., Kishio, K., Ohtani, M., Fukumura, T., Kawasaki, M., & Koinuma, H. (2004). Observation of compositional fluctuation by scanning superconducting quantum interference device (SQUID) microscope in superconducting La _1.8Sr_0.2CuO₄. Japanese Journal of Applied Physics, Part 2: Letters, 43(10 B), L1327-L1329. https://doi.org/10.1143/JJAP.43.L1327

Observation of compositional fluctuation by scanning superconducting quantum interference device (SQUID) microscope in superconducting La _1.8Sr_0.2CuO₄. / Kasai, Junpei; Okazaki, Noriaki; Hasegawa, Tetsuya et al.
In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 43, No. 10 B, 15.10.2004, p. L1327-L1329.

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

Kasai, J, Okazaki, N, Hasegawa, T, Togawa, Y, Sasagawa, T, Shimoyama, JI, Kishio, K, Ohtani, M, Fukumura, T, Kawasaki, M & Koinuma, H 2004, 'Observation of compositional fluctuation by scanning superconducting quantum interference device (SQUID) microscope in superconducting La _1.8Sr_0.2CuO₄', Japanese Journal of Applied Physics, Part 2: Letters, vol. 43, no. 10 B, pp. L1327-L1329. https://doi.org/10.1143/JJAP.43.L1327

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abstract = "In order to visualize spatial distributions of vortices strongly pinned in La1.8Sr0.2CuO4, we have performed scanning superconducting quantum interference device (SQUID) microscopic (SSM) measurements near TC. The obtained SSM images have revealed that stripe-shaped regions with higher Tc run in an arbitrary direction with respect to crystallographic axes. Vortices tend to align in a one-dimensional fashion, negotiating around the higher Tc regions. High-resolution electron probe micro-analysis confirmed that the spatial variation in Tc corresponds well to the modulation of Sr/La composition. We also found that small-angle grain boundaries with tilt angles of 1-3 degrees are less effective in trapping vortices, indicating that superconductivity is not degraded very much.",

keywords = "Compositional fluctuation, LaSr CuO, Overdoped regime, Pinning state, Scanning SQUID microscope",

author = "Junpei Kasai and Noriaki Okazaki and Tetsuya Hasegawa and Yoshihiko Togawa and Takao Sasagawa and Shimoyama, {Jun Ichi} and Kohji Kishio and Makoto Ohtani and Tomoteru Fukumura and Masashi Kawasaki and Hideomi Koinuma",

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AU - Kasai, Junpei

AU - Okazaki, Noriaki

AU - Hasegawa, Tetsuya

AU - Togawa, Yoshihiko

AU - Sasagawa, Takao

AU - Shimoyama, Jun Ichi

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AB - In order to visualize spatial distributions of vortices strongly pinned in La1.8Sr0.2CuO4, we have performed scanning superconducting quantum interference device (SQUID) microscopic (SSM) measurements near TC. The obtained SSM images have revealed that stripe-shaped regions with higher Tc run in an arbitrary direction with respect to crystallographic axes. Vortices tend to align in a one-dimensional fashion, negotiating around the higher Tc regions. High-resolution electron probe micro-analysis confirmed that the spatial variation in Tc corresponds well to the modulation of Sr/La composition. We also found that small-angle grain boundaries with tilt angles of 1-3 degrees are less effective in trapping vortices, indicating that superconductivity is not degraded very much.

KW - Compositional fluctuation

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