Electronic structure near the quantum critical point in V-doped Cr —A high-resolution photoemission study

Department of Condensed Matter Physics and Materials' Science, Tata Institute of Fundamental Research Homi Bhabha Road, Colaba, Mumbai - 400 005, India

^(a) kbmaiti@tifr.res.in

Received: 26 April 2012
Accepted: 13 July 2012

Abstract

We studied the evolution of the electronic structure across the quantum critical point in V-doped Cr employing high-resolution photoemission spectroscopy. Experimental results exhibit signatures of pseudogap and orbital Kondo resonance peak at low temperatures for all the compositions studied. The pseudogap and the Kondo peak reduce with V doping but remain finite across the quantum critical point indicating their relevance in widely discussed quantum phases in correlated electron systems. The spectral lineshape near the Fermi level exhibit (ϵ_F  − ϵ)^0.25 dependence evidencing deviation from Fermi-liquid behavior.