EPR and NMR measurements in LixM(Pc,Nc) (M=Zn,Mg; Pc=phthalocyanine, Nc=naphthalocyanine) are presented. The changes of the electronic properties induced by the substitution of the metal M and by the expansion of the organic core are discussed for the half filling of the conduction band, i.e. for x around 2. The comparison with Li2ZnPc, which behaves as a Fermi liquid, suggests that the substitution of Zn with Mg does not lead to substantial effects. On the contrary in Li2:2MgNc, where a more two-dimensional packing of the molecules is attained, a stronger tendency to localization and a low temperature phase transition towards a spin density wave ground state are observed.
Strong electronic correlations in LixM(Pc,Nc) organic conductors near half flling
FILIBIAN, MARTA;Bordonali L;CARRETTA, PIETRO;MOZZATI, MARIA CRISTINA;GHIGNA, PAOLO;
2010-01-01
Abstract
EPR and NMR measurements in LixM(Pc,Nc) (M=Zn,Mg; Pc=phthalocyanine, Nc=naphthalocyanine) are presented. The changes of the electronic properties induced by the substitution of the metal M and by the expansion of the organic core are discussed for the half filling of the conduction band, i.e. for x around 2. The comparison with Li2ZnPc, which behaves as a Fermi liquid, suggests that the substitution of Zn with Mg does not lead to substantial effects. On the contrary in Li2:2MgNc, where a more two-dimensional packing of the molecules is attained, a stronger tendency to localization and a low temperature phase transition towards a spin density wave ground state are observed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
