Vortex pinning at low temperature under high magnetic field in SmBa2Cu3Oy superconducting films with high number density and small size of BaHfO3 nano-rods
Vortex pinning at low temperature under high magnetic field in SmBa2Cu3Oy superconducting films with high number density and small size of BaHfO3 nano-rods
复制标题
BaHfO3纳米棒高数密度小尺寸SmBa2Cu3Oy超导薄膜低温强磁场涡旋钉扎
DOI：
10.1088/0953-2048/28/11/114006
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
S. Awaji
中科院分区：
文献类型：
--
作者：
S. Miura;Y. Yoshida;Y. Ichino;A. Tsuruta;K. Matsumoto;A. Ichinose;S. Awaji
采用带种子层的低温生长(LTG)技术，在750℃的低衬底温度下制备了体积分数为5.6%BaHfO(BHO)掺杂的SmBCO薄膜。利用LTG技术，即使在较低的生长温度下，也可以得到纯c轴取向的SmBCO薄膜。LTG技术还大大提高了BHO纳米棒的数密度。薄膜中BHO纳米棒的尺寸和匹配场分别为5.4 nm和9.9T，通过输运测量，得到了较高的不可逆场(Birr)和较强的磁通钉扎力密度(Fp)。在77K时，B/c的Birr为15.1T。在40K时，测量了10T时407GN m−3的最大Fp，在20K时测量了9T到17T时的770GN m−3的最大Fp。我们认为，低温热重分析技术对于改善掺杂BAMO_3(BMO：M=Zr，Sn和Hf)的SmBCO涂层导体的磁通钉扎性能具有重要意义。
We have fabricated 5.6 vol.% BaHfO 3 (BHO)-doped SmBa 2 Cu 3 O y (SmBCO) films at a low substrate temperature of 750 C by using the low temperature growth (LTG) technique with a seed layer. Using the LTG technique, we can obtain a purely c-axis oriented SmBCO film even at low growth temperatures. The LTG technique also greatly increases the number density of BHO nanorods. The size and matching field of the BHO nanorods in the films were 5.4 nm and 9.9 T. Transport measurements were carried out, and a high irreversibility field (B irr) and strong flux pinning force density (F p) were obtained. The B irr was 15.1 T at 77 K for B//c. The maximum F p of 407 GN m− 3 in 10 T at 40 K and 770 GN m− 3 from 9 to 17 T at 20 K have been measured. We believe that the LTG technique can be considered as important for improving of flux pinning performance in BaMO 3 (BMO: M= Zr, Sn and Hf)-doped SmBCO coated conductors.