Suppression of Peierls Instability in a Metal−Halide Porous Framework

Abstract

ABSTRACT Peierls distortion is a lattice instability in low‐dimensional materials driven by electron–phonon coupling, which opens an energy gap at the Fermi level and induces a metal–insulator transition. Suppressing this distortion is crucial for stabilizing metallic and superconducting states in low‐dimensional systems, yet achieving such suppression remains challenging without external chemical doping or high‐pressure conditions. Metal–organic framework (MOF) forms a periodic porous structure with well‐defined channels and functional sites. In this work, we harness the intrinsic periodic electrostatic potential of a porous framework to suppress the Peierls instability in one‐dimensional platinum−halide (Pt−X) chains. By integrating Pt−X chains into the ordered nanochannels of the porous material, we achieved suppression of detectable Peierls distortion, as evidenced by the absence of lattice distortion and an approximately four‐order‐of‐magnitude enhancement in its electrical conductivity (from 4.8 × 10 −6 to 4.3 × 10 −2 S/cm) compared to the distorted counterparts. This study demonstrates an example where the intrinsic periodic electrostatic potential of a porous framework can be employed to suppress the Peierls distortion, providing new insight for achieving controllable electronic properties in low‐dimensional electronic materials.