Anomalous low-temperature heat capacity in antiperovskite compounds

Guo Xin-Ge^{1, 2}, Lin Jian-Chao¹, Tong Peng^{1, †}, Lin Shuai¹, Yang Cheng¹, Lu Wen-Jian¹, Song Wen-Hai¹, Sun Yu-Ping^{1, 3, 4}

(color online) Plots of (C − γT)/T ³ versus T with a combination of both Debye and Einstein models for GaNMn₃ (a) and Ag_0.6NMn_3.4 (b). The solid line refers to the total contribution from both models, and the dashed-dotted and dotted lines represent the individual contributions from Debye (C _D) and Einstein (C _E) terms, respectively. The open circles denote the experimental data.