Remarkable Thermochromism in the Double Perovskite Cs₂NaFeCl₆

Fuxiang Ji, Johan Klarbring, Bin Zhang, Feng Wang, Linqin Wang, Xiaohe Miao, Weihua Ning, Muyi Zhang, Xinyi Cai, Babak Bakhit, Martin Magnuson, Xiaoming Ren, Licheng Sun, Mats Fahlman, Irina A. Buyanova, Weimin M. Chen, Sergei I. Simak, Igor A. Abrikosov, Feng Gao