Tuning the Hysteresis of a Metal-Insulator Transition via Lattice Compatibility

Abstract

Structural phase transitions serve as the basis for many functional applications including shape memory alloys (SMAs), switches based on metal-insulator transitions (MITs), etc. In such materials, lattice incompatibility between phases often results in a thermal hysteresis, which is intimately tied to degradation of reversibility of the transformation. The non-linear theory of martensite suggests that the hysteresis of a martensitic phase transformation is solely determined by the lattice constants, and the conditions proposed for geometrical compatibility have been successfully applied to minimizing the hysteresis in SMAs. In this work, we apply the non-linear theory to a strongly correlated oxide system (W doped VO2), and show that the hysteresis of the MIT in the system can be directly tuned by adjusting the lattice constants of the phases. The results underscore the profound influence structural compatibility has on intrinsic electronic properties, and indicate that the theory provides a universal guidance for optimizing phase transforming materials.

5 figures plus supplementary materials

References in corpus (5)

• Evidence for a Structurally-driven Insulator-to-metal Transition in VO2: a View from the Ultrafast Timescale
• Measurement of a solid-state triple point at the metal-insulator transition in VO2
• Study of the cofactor conditions: conditions of supercompatibility between phases
• Signature of persistent metallic domains in FORC measurements of the VO${}_2$ metal-insulator transition
• Direct evidence of tungsten clustering in W${}_{\text{0.02}}$V${}_{\text{0.98}}$O${}_{\text{2}}$ thin films and its effect on the metal-to-insulator transition

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• Ionic liquid gating induced two superconductor-insulator phase transitions in spinel oxide Li${}_{1\pm x}$Ti${}_2$O${}_{4-\delta }$
• Energy conversion from heat to electricity by highly reversible phase-transforming ferroelectrics
• Superconducting memory and trapped magnetic flux in ternary lanthanum polyhydrides