Giant Negative Linear Compressibility in Orthorhombic Copper Cyanide

2024/10/29 by Swayam Kesari, Alka B. Garg, Kesari, Swayam +5
Engineering · Materials Science · #Boron and Carbon Nanomaterials Research #Elasticity and Material Modeling #Engineering Structural Analysis Methods #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci)

paper · pdf · doi:10.48550/arxiv.2410.21623

openalex publication_date 2024/10/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Most reported negative linear compressibility (NLC) materials exhibit either a small NLC over a large pressure range or a high NLC over a very small pressure range. Here, we report the remarkable discovery of giant NLC in the low-temperature form of CuCN (LT-CuCN) over an unusually large pressure range. High-pressure XRD studies on LT-CuCN observed the NLC of -20.5 TPa-1 along the a-axis at zero pressure, and the ambient orthorhombic phase remained stable up to 9.8 GPa. Pressure and temperature-dependent Raman studies identified the phonon vibrations responsible for NLC and negative thermal expansion (NTE).

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