TY - JOUR
T1 - Surface Diffusion Constants and Supersaturations in SmBCO Films Prepared by Pulsed Laser Deposition Method
AU - Ichino, Yutaka
AU - Shimazaki, Naoto
AU - Miura, Shun
AU - Tsuchiya, Yuji
AU - Yoshida, Yutaka
N1 - Funding Information:
Manuscript received September 14, 2017; accepted January 25, 2018. Date of publication January 31, 2018; date of current version February 20, 2018. This work was supported in part by the Grant-in-Aid for Scientific Research (23226014, 25289358, 15H04252, 15K14301, 15K14302, and 16H04512) and in part by the ALCA project of the Japan Science and Technology Agency. (Corresponding author: Yutaka Ichino.) Y. Ichino, N. Shimazaki, Y. Tsuchiya, and Y. Yoshida are with the Department of Energy Engineering and Science, Nagoya University, Nagoya 464-8603, Japan (e-mail: ichino@nuee.nagoya-u.ac.jp).
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2018/6
Y1 - 2018/6
N2 - REBa2Cu3Oy (REBCO, RE = rare earth) coated conductors are required for high current carrying capability. Self-organization of Ba-M-O (BMO, M = Zr, Sn, Hf...) is available to improve critical current density (Jc) in magnetic field, and suppression of a-axis grain growth contributes to enhance Jc. The former and latter are affected by the surface diffusion of adatoms and supersaturation in the REBCO film growth, respectively. We focused on surface morphologies of SmBa2Cu3Oy (SmBCO) films deposited by the pulsed laser deposition method in this paper, and estimated surface diffusion constant and supersaturation from the surface morphologies. As a result, an activation energy of the surface diffusion was approximately 2.2 eV and the value is somewhat smaller than 2.5 eV for YBCO films. Additionally, we found that a-axis grains appeared when supersaturation (Δμ) became higher than a threshold Δμ. Interestingly, a seed layer consisting of c-axis oriented SmBCO suppressed a -axis grain growth. These findings are useful to improve Jc in REBCO coated conductors.
AB - REBa2Cu3Oy (REBCO, RE = rare earth) coated conductors are required for high current carrying capability. Self-organization of Ba-M-O (BMO, M = Zr, Sn, Hf...) is available to improve critical current density (Jc) in magnetic field, and suppression of a-axis grain growth contributes to enhance Jc. The former and latter are affected by the surface diffusion of adatoms and supersaturation in the REBCO film growth, respectively. We focused on surface morphologies of SmBa2Cu3Oy (SmBCO) films deposited by the pulsed laser deposition method in this paper, and estimated surface diffusion constant and supersaturation from the surface morphologies. As a result, an activation energy of the surface diffusion was approximately 2.2 eV and the value is somewhat smaller than 2.5 eV for YBCO films. Additionally, we found that a-axis grains appeared when supersaturation (Δμ) became higher than a threshold Δμ. Interestingly, a seed layer consisting of c-axis oriented SmBCO suppressed a -axis grain growth. These findings are useful to improve Jc in REBCO coated conductors.
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U2 - 10.1109/TASC.2018.2800078
DO - 10.1109/TASC.2018.2800078
M3 - Article
AN - SCOPUS:85041410385
VL - 28
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 4
M1 - 7500304
ER -