TY - JOUR
T1 - Possible Kondo scattering and its signature in Seebeck coefficient in topological superconductor Fe1+yTe0.55Se0.45
AU - Yang, Yusen
AU - Tang, Guoxiong
AU - Yao, Chao
AU - Yan, Xiaoxian
AU - Wang, Yu
AU - Xu, Xiangfan
AU - Mao, Zhiqiang
AU - Xing, Hui
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/12/15
Y1 - 2022/12/15
N2 - Fe1+yTe1-xSex is an iconic topological superconductor with Majorana zero mode in the Abrikosov vortex core, holding potential for topological quantum computing. However, the presence of interstitial iron impurities in this system induces spontaneous magnetization, which often hinders access to the intrinsic behavior. Here, we show that in high-quality Fe1+yTe0.55Se0.45 single crystals, no trace of spontaneous magnetization can be found using the highly sensitive Nernst measurement. Instead, a negative magnetoresistance with intriguing temperature and field dependences is observed, with corresponding signatures also found in the magneto Seebeck effect. These observations point to possible Kondo scattering in the normal state of the superconductor originating from the fluctuating magnetic moment of the interstitial irons, which constitute a non-negligible factor in interpreting the low-temperature transport behaviors.
AB - Fe1+yTe1-xSex is an iconic topological superconductor with Majorana zero mode in the Abrikosov vortex core, holding potential for topological quantum computing. However, the presence of interstitial iron impurities in this system induces spontaneous magnetization, which often hinders access to the intrinsic behavior. Here, we show that in high-quality Fe1+yTe0.55Se0.45 single crystals, no trace of spontaneous magnetization can be found using the highly sensitive Nernst measurement. Instead, a negative magnetoresistance with intriguing temperature and field dependences is observed, with corresponding signatures also found in the magneto Seebeck effect. These observations point to possible Kondo scattering in the normal state of the superconductor originating from the fluctuating magnetic moment of the interstitial irons, which constitute a non-negligible factor in interpreting the low-temperature transport behaviors.
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U2 - 10.1016/j.jmmm.2022.170126
DO - 10.1016/j.jmmm.2022.170126
M3 - Article
AN - SCOPUS:85141284223
SN - 0304-8853
VL - 564
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
M1 - 170126
ER -