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Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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Mott transition in a valence-bond solid insulator with a triangular lattice.

Y Shimizu¹, H Akimoto, H Tsujii

¹RIKEN, Wako, Saitama 351-0198, Japan.

Physical Review Letters

|February 1, 2008

Summary

This study explores the Mott transition in a spin-frustrated material, revealing a valence-bond solid phase near superconductivity. Unlike other Mott insulators, its metallic phase shows unusual resistivity, rho=rho{0}+AT(2.5).

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Area of Science:

Condensed matter physics
Materials science
Quantum magnetism

Background:

Mott insulators are materials that should be metallic based on band theory but are insulating due to electron-electron interactions.
Understanding Mott transitions is crucial for developing novel electronic materials.
Spin frustration in a triangular lattice can lead to exotic electronic phases.

Purpose of the Study:

To investigate the Mott transition in a quasi-two-dimensional Mott insulator, EtMe3P[Pd(dmit)2]2, under hydrostatic pressure and magnetic fields.
To map the pressure-temperature (P-T) phase diagram and identify emergent phases.
To characterize the electronic transport properties, particularly resistivity, in the metallic phase.

Main Methods:

Synthesis and characterization of the quasi-two-dimensional Mott insulator EtMe3P[Pd(dmit)2]2.
Application of hydrostatic pressure and magnetic fields to induce and control phase transitions.
Electrical resistivity measurements as a function of temperature and pressure.

Main Results:

A valence-bond solid phase was identified adjacent to the superconductor and metal phases at low temperatures in the P-T phase diagram.
The observed phase diagram shares similarities with Mott insulators exhibiting antiferromagnetic order.
The metallic phase displays anomalous temperature-dependent resistivity: rho=rho{0}+AT(2.5), deviating from typical antiferromagnetic Mott insulators.

Conclusions:

The compound EtMe3P[Pd(dmit)2]2 exhibits a complex phase diagram featuring a valence-bond solid phase.
The anomalous resistivity in the metallic phase suggests unique electronic correlations beyond simple antiferromagnetism.
Further research is needed to fully understand the nature of the spin frustration and its impact on the Mott transition in this system.