Mesoscopic phase separation in NaxCoO2 (0.65 CARRETTA, PIETRO;MARIANI, MANUEL;C. B. Azzoni;MOZZATI, MARIA CRISTINA;I. Bradaric;I. Savic;A. Feher;J. Sebek 2004-01-01 Abstract Nuclear magnetic resonace sNMRd, EPR and magnetization measurements in NaxCoO2 for 0.65 Scheda breve Scheda completa Scheda completa (DC) Anno 2004 Tematica The Physics category includes resources of a broad, general nature that contain materials from all areas of physics, The category also includes resources specifically concerned with the following physics sub-fields: mathematical physics, particle and nuclear physics, physics of fluids and plasmas, quantum physics, and theoretical physics. Rivista su cui è pubblicata l'opera PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS Pubblicazione ISI sì Codice ISI WOS:000222996600042 Codice Scopus EID 2-s2.0-42749101176 Referee Esperti anonimi Lingua/e Inglese Rilevanza Internazionale Formato STAMPA Volume 70 Da pagina 024409 Presenza di coautori internazionali sì Numero autori 8 Tipologia info:eu-repo/semantics/article Tipologia sito docente 262 Tutti gli autori Carretta, Pietro; Mariani, Manuel; C. B., Azzoni; Mozzati, MARIA CRISTINA; I., Bradaric; I., Savic; A., Feher; J., Sebek var reduxStatus="expanded"; var peopleText="<em>Carretta, Pietro; Mariani, Manuel; C. B., Azzoni; Mozzati, MARIA CRISTINA; I., Bradaric; I., Savic; A., Feher; J., Sebek</em>"; var peopleReduxSize="150"; var peopleTextReduced="Carretta, Pietro; Mariani, Manuel; C. B., Azzoni; Mozzati, MARIA CRISTINA; I., Bradaric; I., Savic; A., Feher; J., Sebek"; //var firstPeopleButton=false; //document.getElementById("dc.description.allpeople_inner").addEventListener('load',function(){ function init(){ if(peopleText.length<=peopleReduxSize){ peopleReduxText=peopleText; }else{ //peopleReduxText=peopleText.substring(peopleText,0,peopleReduxSize); //document.getElementById("dc.description.allpeople_inner").innerHtml=peopleReduxText; //reduxStatus="reduxed"; //document.getElementById("dc.description.allpeople_redux").innerHTML="... <button type='button' class='btn btn-success' onclick='init()'><b>+</b></button>"; if(reduxStatus=="reduxed"){ document.getElementById("dc.description.allpeople_inner").innerHTML=peopleText; reduxStatus="expanded"; firstPeopleButton=true; document.getElementById("dc.description.allpeople_redux").innerHTML="<span style='cursor:pointer' onclick='init()'> <u>comprimi</u></span>"; } else if(reduxStatus=="expanded"){ document.getElementById("dc.description.allpeople_inner").innerHTML=peopleTextReduced; reduxStatus="reduxed"; firstPeopleButton=true; document.getElementById("dc.description.allpeople_redux").innerHTML="...<span style='cursor:pointer' onclick='init()'><u>espandi</u></span>"; } } } //,false); //init(); Tipologia 1 Contributo su Rivista::1.1 Articolo in rivista Fulltext none Appare nelle tipologie: 1.1 Articolo in rivista

Nuclear magnetic resonace sNMRd, EPR and magnetization measurements in NaxCoO2 for 0.65<x<0.75 are presented. While the EPR signal arises from Co4+ magnetic moments ordering at Tc.26 K, 59Co NMR signal originates from cobalt nuclei in metallic regions with no long range magnetic order and characterized by a generalized susceptibility typical of strongly correlated metallic systems. This phase separation in metallic and magnetic insulating regions is argued to occur below T*(x) (220–270 K). Above T* an anomalous decrease in the intensity of the EPR signal is observed and associated with the delocalization of the electrons which for T<T* were localized on Co4+ dz2 orbitals. It is pointed out that the in-plane antiferromagnetic coupling J <<T* cannot be the driving force for the phase separation.