Evolution of superconducting and transport properties in annealed FeTe1−xSex (0.1 ≤ x ≤ 0.4) multiband superconductors
Evolution of superconducting and transport properties in annealed FeTe1−xSex (0.1 ≤ x ≤ 0.4) multiband superconductors
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DOI：
10.1088/0953-2048/28/4/044002
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发表时间：
2015-02
影响因子：
3.6
通讯作者：
Yue Sun;T. Taen;Tatsuhiro Yamada;Y. Tsuchiya;S. Pyon;T. Tamegai
中科院分区：
文献类型：
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作者：
Yue Sun;T. Taen;Tatsuhiro Yamada;Y. Tsuchiya;S. Pyon;T. Tamegai
我们研究了fete1−x ?的超导和输运性质。>性别(0.1≤？> x≤？用o2退火法制备> 0.4)单晶。在磁化测量中观察到的明显的超导转变宽度和较小的残余电阻率证明了晶体的高质量。所有晶体均表现出大的、均匀的、各向同性的临界电流密度Jc，在2k下自场值超过105 a cm−2。大且场稳健的临界电流密度证明了FeTe 1−x ？>性别(0.1≤？> x≤？>.4)是散装性质的。不同硒掺杂水平晶体的各向异性参数值均在2 ~ 3之间。霍尔系数RH在高温下保持正且几乎恒定，在达到Tc之前突然减小，这表明电子型载流子在低温下占主导地位。随着硒的掺入，相对湿度骤降的特征温度逐渐升高。
We investigated the superconducting and transport properties in FeTe 1 − x ?> Sex (0.1 ≤ ?> x ≤ ?> 0.4) single crystals prepared by O2-annealing. The sharp superconducting transition width observed in the magnetization measurement and the small residual resistivity prove the high quality of the crystals. All the crystals manifest large, homogeneous, and isotropic critical current density Jc with a self-field value over 105 A cm−2 at 2 K. The large and field-robust critical current densities prove that the superconductivity in FeTe 1 − x ?> Sex (0.1 ≤ ?> x ≤ ?> 0.4) is in bulk nature. The values of anisotropy parameter close to Tc for crystals with different Se doping levels all reside in the range of 2–3. Hall coefficients RH remain positive and at an almost constant value at high temperatures, followed by a sudden decrease before reaching Tc, which indicates that the electron-type charge carriers become dominant at low temperatures. Furthermore, the characteristic temperature for the sudden decrease in RH gradually increases with Se doping.