Electronic band structure and Fermi surfaces of the quasi–two-dimensional monophosphate tungsten bronze, P₄W₁₂O₄₄

¹ Department of Physical Sciences, Indian Institute of Science Education and Research-Kolkata, Mohanpur Campus Nadia 741252, India
² Department of Physics, Tohoku University - Sendai 980-8578, Japan
³ Solid State and Structural Chemistry Unit, Indian Institute of Science - Bangalore 560 012, India
⁴ WPI Research Center, Advanced Institute for Materials Research, Tohoku University - Sendai 980-8577, Japan
⁵ Department of Chemistry and Chemical Biology, The State University of New Jersey - 610 Taylor Road, Piscataway, NJ LLL08854, USA

^(a) raj@iiserkol.ac.in

Received: 10 January 2014
Accepted: 6 February 2014

Abstract

The electronic structure of quasi-two-dimensional monophosphate tungsten bronze, P₄W₁₂O₄₄, has been investigated by high-resolution angle-resolved photoemission spectroscopy and density functional theoretical calculations. Experimental electron-like bands around point and Fermi surfaces have similar shapes as predicted by calculations. Fermi surface mapping at different temperatures shows a depletion of density of states at low temperature in certain flat portions of the Fermi surfaces. These flat portions of the Fermi surfaces satisfy the partial nesting condition with incommensurate nesting vectors and , which leads to the formation of charge density waves in this phosphate tungsten bronzes. The setting up of charge density wave in these bronzes can well explain the anomaly observed in its transport properties.