Giant Negative Linear Compressibility in Orthorhombic Copper Cyanide
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).
Authors
- Swayam Kesari (ORCID: https://orcid.org/0000-0002-5597-4406)
- Nilesh P. Salke (ORCID: https://orcid.org/0000-0001-8662-9210)
- Alka B. Garg (ORCID: https://orcid.org/0000-0003-4050-8469)
- Rekha Rao (ORCID: https://orcid.org/0000-0002-1848-6171)
Institutions
- Bhabha Atomic Research Centre (IN)
- Homi Bhabha National Institute (IN)
- University of Illinois Chicago (US)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-03-26
- DOI
- https://doi.org/10.1103/physrevlett.134.126102
- Citations
- 4
- Primary Topic
- Thermal Expansion and Ionic Conductivity
- Type
- article
- Field-Weighted Citation Impact
- 2.07
Funders
- National Science Foundation
- U.S. Department of Energy
- Department of Science and Technology, Ministry of Science and Technology, India
- Bhabha Atomic Research Centre