上海科技大学知识管理系统

The negative compressibility effect with the exotic compression-expansion behavior has attracted extensive attention. Here, we present a giant negative area compressibility (NAC) with a magnitude of-157.6 TPa-1 in layered superconductor Sn4P3, which is driven by a pressure-induced isostructural phase transition that preserves the pristine R (3) over bar m symmetry. Sn4P3 is the first intrinsic superconductor that hosts NAC and manifests the largest NAC coefficient to date. Furthermore, the superconducting transition temperature (T-c) is significantly enhanced accompanied by NAC, reaching a maximum value of similar to 7.85 K. The formation of dimerized P1-P3 in the high-pressure isostructural phase (HP-R (3) over barm) improves the density of states of P atoms around the Fermi level, which is vital for the increment of T-c. Moreover, in the frame of electron-phonon coupling, the coupling of P-phonon modes and Sn-p electrons is responsible for the superconducting state in the HP-R (3) over bar m phase. Our work not only enriches the NAC material family but also facilitates the understanding of the impact of NAC on superconducting properties.