Crystallinity of a-axis oriented YBa2Cu3O7−δ thin films epitaxially grown on NdGaO3 (110) and SrTiO3 (100)

Homma, Norio; Okayama, S.; Takahashi, H.; Kawamoto, Shinji; Yoshida, Isao; Kamei, Motohiro; Morishita, Tadataka; Haga, T.; Yamaya, K.

doi:10.1016/s0921-4534(05)80025-5

Cited by 12 publications

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“…YBCO buffer layers deposited at lower temperature on (100) SrTiO 3 and LaAlO 3 substrates [8,9] resulted in good quality but twinned a-axis films. The best reports refer instead to a-axis films grown on a PrBa 2 Cu 3 O 7−δ (PBCO) buffer layer on (100) SrLaGaO 4 (SLGO) substrates [10][11][12][13][14][15][16][17], that are also * floriana.lombardi@chalmers.se untwinned. Moreover, a-axis films have much smaller grains than c-axis films [2], which can give rise to rougher surfaces and complications in the realization of multilayer structures.…”

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confidence: 99%

Study of in-plane electrical transport anisotropy of a -axis oriented YBa2Cu3O7−δ nanodevices

et al. 2017

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In the present work, we report the growth of fully untwinned high-quality a-axis-oriented YBa 2 Cu 3 O 7−δ films on (100) SrLaGaO 4 substrates by using PrBa 2 Cu 3 O 7−δ as a buffer layer. We also fabricated nanowires at different angles γ with respect to the [0,1,0] direction of the substrate and studied the in-plane anisotropy of the critical current density, which we explained by considering the anisotropy in the coherence length ξ and London penetration depth λ L . Finally, half-integer Shapiro-like steps measured in slightly underdoped c-axis oriented (γ = 90• ) nanowires point towards a different transport regime, which could shed light on intriguing issues of high-critical-temperature superconductors.

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