講演情報
[8a-N404-3]Understanding the Structural Evolution in Y-doped Ba0.6K0.4Fe2As2 Superconductor
〇(D)Nur Rahmawati Ayukaryana1, Fumiya Shimoyama1, Akiyasu Yamamoto1 (1.Tokyo Univ. of Agri. and Tech.)
キーワード：
Iron based superconductor、Yttrium doping、Structural evolution
The K-doped BaFe2As2 (K-Ba122) compound is a leading candidate for the next generation superconducting materials due to the high critical temperature of 38 K and strong robustness against high magnetic fields with upper critical field value of more than 50 T[1][2]. The presence of FeAs and Ba-O wetting phase formations at grain boundaries inhibits the superconducting current flow, thereby hindering its development for practical applications[3][4]. While the mechanism of such wetting phases remains unknown[4], we reported the reduction of FeAs phases through thermodynamically driven strategy to control oxygen by introducing yttrium (Figure 1)[5]. On the other hand, the introduction of yttrium caused systematic lattice parameter changes as shown in Figure 2.
Herein, we investigate the structural and physical properties of Y-doped K-Ba122 bulks by tuning the milling energy[6] and synthesizing Y-doped BaFe2As2 compound to distinguish their contribution to the lattice distortion profile. Mechanical alloying by high-energy ball milling and heat treatment by spark plasma sintering[7] were employed to fabricate the bulk samples. Material characterizations including XRD analysis, SEM-EDX observation, resistivity and magnetization measurements through PPMS-VSM were conducted.
Herein, we investigate the structural and physical properties of Y-doped K-Ba122 bulks by tuning the milling energy[6] and synthesizing Y-doped BaFe2As2 compound to distinguish their contribution to the lattice distortion profile. Mechanical alloying by high-energy ball milling and heat treatment by spark plasma sintering[7] were employed to fabricate the bulk samples. Material characterizations including XRD analysis, SEM-EDX observation, resistivity and magnetization measurements through PPMS-VSM were conducted.