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• W2951572167 abstract "NaSn2As2 is mechanically exfoliable layered van der Waals (vdW) Zintl phase that is getting interesting due to its low thermal conductivity and recently observed superconductivity. Here, we have investigated the temperature dependent local structure of NaSn2As2 by a combined analysis of As K-edge and Sn K-edge extended x-ray absorption fine structure measurements. The system is intrinsically disordered with the interatomic distances largely consistent to those estimated by average structure measurements. The stretching force constants of different bond distances have been determined using temperature dependent mean square relative displacements. The Sn–As distance is the strongest bond in this system, having covalent nature, unlike the weaker interlayer distances which are characterized by vdW type bonding. Among them, As–Na distance is slightly weaker than Sn–Sn(i) below ∼200 K and tends to get stronger above this temperature. The anomalous behavior of As–Na bond suggests that the mechanical exfoliation in this system is likely to be temperature dependent. The anomaly in the interlayer atomic correlations may be due to a charge density wave-like instability around this temperature, indicated by earlier experiments. The local structure and disorder are discussed in relation to the physical properties of NaSn2As2." @default.
• W2951572167 created "2019-06-27" @default.
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• W2951572167 date "2019-07-23" @default.
• W2951572167 modified "2023-10-15" @default.
• W2951572167 title "Temperature dependent local atomic displacements in NaSn2As2 system" @default.
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• W2951572167 doi "https://doi.org/10.1088/1361-648x/ab2bd4" @default.
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