Mesoscopic phase separation in NaxCoO2 (0.65 LT = x LT = 0.75)
Апстракт
Nuclear magnetic resonace (NMR), EPR and magnetization measurements in NaxCoO2 for 0.65less than or equal toxless than or equal to0.75 are presented. While the EPR signal arises from Co4+ magnetic moments ordering at T(c)similar or equal to26 K, Co-59 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 LT T-* were localized on Co4+ d(z)(2) orbitals. It is pointed out that the in-plane antiferromagnetic coupling JT(*) cannot be the driving force for the phase separation.
Извор:
Physical Review B: Condensed Matter and Materials Physics, 2004, 70, 2
DOI: 10.1103/PhysRevB.70.024409
ISSN: 1098-0121
WoS: 000222996600042
Scopus: 2-s2.0-42749101176
Колекције
Институција/група
VinčaTY - JOUR AU - Carretta, P AU - Mariani, M AU - Azzoni, CB AU - Mozzati, MC AU - Bradarić, Ivica AU - Savić, Ilija AU - Feher, A AU - Sebek, J PY - 2004 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2793 AB - Nuclear magnetic resonace (NMR), EPR and magnetization measurements in NaxCoO2 for 0.65less than or equal toxless than or equal to0.75 are presented. While the EPR signal arises from Co4+ magnetic moments ordering at T(c)similar or equal to26 K, Co-59 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 LT T-* were localized on Co4+ d(z)(2) orbitals. It is pointed out that the in-plane antiferromagnetic coupling JT(*) cannot be the driving force for the phase separation. T2 - Physical Review B: Condensed Matter and Materials Physics T1 - Mesoscopic phase separation in NaxCoO2 (0.65 LT = x LT = 0.75) VL - 70 IS - 2 DO - 10.1103/PhysRevB.70.024409 ER -
@article{ author = "Carretta, P and Mariani, M and Azzoni, CB and Mozzati, MC and Bradarić, Ivica and Savić, Ilija and Feher, A and Sebek, J", year = "2004", abstract = "Nuclear magnetic resonace (NMR), EPR and magnetization measurements in NaxCoO2 for 0.65less than or equal toxless than or equal to0.75 are presented. While the EPR signal arises from Co4+ magnetic moments ordering at T(c)similar or equal to26 K, Co-59 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 LT T-* were localized on Co4+ d(z)(2) orbitals. It is pointed out that the in-plane antiferromagnetic coupling JT(*) cannot be the driving force for the phase separation.", journal = "Physical Review B: Condensed Matter and Materials Physics", title = "Mesoscopic phase separation in NaxCoO2 (0.65 LT = x LT = 0.75)", volume = "70", number = "2", doi = "10.1103/PhysRevB.70.024409" }
Carretta, P., Mariani, M., Azzoni, C., Mozzati, M., Bradarić, I., Savić, I., Feher, A.,& Sebek, J.. (2004). Mesoscopic phase separation in NaxCoO2 (0.65 LT = x LT = 0.75). in Physical Review B: Condensed Matter and Materials Physics, 70(2). https://doi.org/10.1103/PhysRevB.70.024409
Carretta P, Mariani M, Azzoni C, Mozzati M, Bradarić I, Savić I, Feher A, Sebek J. Mesoscopic phase separation in NaxCoO2 (0.65 LT = x LT = 0.75). in Physical Review B: Condensed Matter and Materials Physics. 2004;70(2). doi:10.1103/PhysRevB.70.024409 .
Carretta, P, Mariani, M, Azzoni, CB, Mozzati, MC, Bradarić, Ivica, Savić, Ilija, Feher, A, Sebek, J, "Mesoscopic phase separation in NaxCoO2 (0.65 LT = x LT = 0.75)" in Physical Review B: Condensed Matter and Materials Physics, 70, no. 2 (2004), https://doi.org/10.1103/PhysRevB.70.024409 . .