Bulk Bi-Sb polycrystals underpinned by high electron/phonon mean free path ratio enabling thermoelectric cooling under 77 K by Xiaowei Wu, Zhen Fan, Hangtian Zhu, Tianyu Wang, Meng Liu, Jun Li, Nan Chen, Qiulin Liu, Zhen Lu, Guodong Li, Xin Qian, Te-Huan Liu, Ronggui Yang, Xiaoyan Niu, Qi Zhao, Zhiliang Li, Shufang Wang, Huaizhou Zhao

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