[논문]<tex>$BaHfO_3$</tex> 완충층을 사용한 IBAD MgO 기판 위에 제조된 고임계전류밀도의 <tex>$GdBa_2Cu_3O_y$</tex> 박막

고경필; 이정우; 고락길; 문승현; 오상수; 유상임

doi:10.9714/psac.2011.13.1.006

$BaHfO_3$ 완충층을 사용한 IBAD MgO 기판 위에 제조된 고임계전류밀도의 $GdBa_2Cu_3O_y$ 박막
High-$J_c$ $GdBa_2Cu_3O_y$ films on $BaHfO_3$ buffered IBAD MgO template 원문보기

한국초전도·저온공학회논문지 = Superconductivity and cryogenics, v.13 no.1, 2011년, pp.6 - 11

고경필 (포스코 기술연구원) , 이정우 (서울대학교 재료공학부) , 고락길 (한국전기 연구원 초전도연구센터) , 문승현 ((주)서남) , 오상수 (한국전기 연구원 초전도연구센터) , 유상임 (서울대학교 재료공학부)

Abstract ▼ AI-Helper

The $BaHfO_3$ (BHO) buffer layer on the IBAD MgO template was turned to be effective for a successful fabrication of $GdBa_2Cu_3O_{7-{\delta}}$ (GdBCO) films with high critical current density ($J_c$). Both the BHO buffer layers and GdBCO films were prepared by pulsed laser deposition (PLD). The effects of the PLD conditions, including substrate temperature ($T_s$), oxygen partial pressure ($PO_2$), and deposition time on the in-plane texture, surface roughness, and microstructures of the BHO buffer layers on the IBAD MgO template were systematically studied for processing optimization. The c-axis oriented growth of BHO layers was insensitive to the deposition temperature and the film thickness, while the in-plane texture and surface roughness of those were improved with increasing $T_s$ from 700 to $800^{\circ}C$. On the optimally processed BHO buffer layer, the highest $J_c$ value (77 K, self-field) of 3.68 $MA/cm^2$ could be obtained from GdBCO film deposited at $780^{\circ}C$, representing that BHO is a strong candidate for the buffer layer on the IBAD MgO template.

주제어

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가설 설정

As can be seen in Fig. 4(d), a-axis-free GdBCO film could b연 obtained at of 800℃. Therefore, the substrate temperature of 800℃ is required for obtaining only c~axis oriented GdBCO film on the BHO buffer layer.

제안 방법

5(d)). In order to identify this phase, we performed EPMA analysis for GdBCO sample deposited at Ts of 800℃. From the SEM image of Fig.

이론/모형

The atomic element distributions in the GdBCO film were analyzed by an electron probe micro analyzer (EPMA, JXA-8900R). The critical temperature, Tc and the critical current, Ic values of GdBCO films were measured by the standard four-probe method using 1 pV/cm criterion.

후속연구

MgO template. However, further study to develop a new effective buffer layer is still required for the IBAD MgO template. In this 아負dy, we have selected BaHfOa as a potential buffer layer on the IBAD MgO template since it shows an excellent chemical compatibility with YBCO and also a very small lattice-mismatch with MgO (定0.

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