2021/02/05 by Rafikul Ali Saha, Abhisek Bandyopadhyay, A. Bandyopadhyay +5
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Charge (physics) #Charge ordering #Chemistry #Colossal magnetoresistance #Condensed matter physics #Electric field #Electronic and Structural Properties of Oxides #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetoresistance #Materials science #Metal #Metal–insulator transition #Physics #Transition metal #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.104.045149
arxiv created 2021/02/05 · openalex created_date 2021/02/15 · openalex publication_date 2021/07/29 · arxiv updated 2021/08/11 · openalex updated_date 2026/08/05
Colossal electroresistance (CER) in manganites, i.e., a large change in electrical resistance as a function of varying applied electric field or applied electric current, has often been described as complimentary to the colossal magnetoresistance (CMR) effect. Mixed valence vanadates with active t2g and empty eg orbitals, unlike manganites, have not naturally been discussed in this context, as double exchange based CMR is not realizable in them. However, presence of coupled spin and orbital degrees of freedom, metal-insulator transition (MIT) accompanied by orbital order-disorder transition, still make the vanadates important. Here we probe a Fe-doped hollandite lead vanadate PbFe1.75V4.25O11 (PFVO), which exhibits a clear MIT as a function of temperature. Most importantly, a giant fall in the resistivity, indicative of a CER, as well as a systematic shift in the MIT towards higher temperatures are observed with increasing applied current. Detailed structural, magnetic, thermodynamic, and transport studies point towards a complex interplay between the structural distortion, orbital order/disorder effect, and the resultant MIT and magnetic ordering in this system.