反钙钛矿锰氮化物Ag1-xNMn3 +x（0<x<0.6）中与反铁磁有序演化相关的可调负热膨胀
Tunable negative thermal expansion related with the gradual evolution of antiferromagnetic ordering in antiperovskite manganese nitrides Ag1-xNMn3+x (0<x<0.6)
摘要：
本文报道了反钙钛矿型锰氮化物Ag_（1-x）NMn_（3 +x）的热膨胀和磁性。Mn对Ag的替代有效地拓宽了负热膨胀的温度范围并将其驱动到低温。随着x的增加，顺磁（PM）到反铁磁（AFM）的相变温度（TN）降低。在x~0.2处，PM-AFM转变与AFM到玻璃状状态转变重叠。在x=0.2以上，观察到两个新的明显的磁性转变：一个发生在室温以上从PM到铁磁（FM），另一个在较低的温度（T*）下，AFM和FM有序参与。进一步的电子自旋共振测量表明，在T* 附近的增宽体积变化与原子力显微镜（AFM）的Γ5g有序度的演化密切相关。
英文摘要：
The thermal expansion and magnetic properties of antiperovskite manganese nitrides Ag1-xNMn3+x were reported. The substitution of Mn for Ag effectively broadens the temperature range of negative thermal expansion and drives it to cryogenic temperatures. As x increases, the paramagnetic (PM) to antiferromagnetic (AFM) phase transition temperature (TN) decreases. At x~0.2, the PM-AFM transition overlaps with the AFM to glass-like state transition. Above x=0.2, two new distinct magnetic transitions were observed: one occurs above room temperature from PM to ferromagnetic (FM), and the other one evolves at a lower temperature (T*) below which both AFM and FM orderings are involved. Further electron spin resonance measurement suggests that the broadened volume change near T* is closely related with the evolution of Γ5g AFM ordering.
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