Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-08-13
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1103/PhysRevB.77.060403
Frequency shifts and nuclear relaxations of 13C NMR of the metal-insulator alternating material, (Me-3,5-DIP)[Ni(dmit)2]2, are presented. The NMR absorption lines originating from metallic and insulating layers are well resolved, which evidences the coexistence of localized spins (\pi_loc) and conduction \pi-electrons. The insulating layer is newly found to undergo antiferromagnetic long range order at about 2.5 K, suggesting emergence of S=1/2 Mott insulator. In the metallic layer, we found significant suppressions of static and dynamical susceptibilities of conduction electrons below 35 K, where antiferromagnetic correlation in the insulating layer evolves. We propose a dynamical effect through strong \pi-\pi_loc coupling between the metallic and insulating layers as an origin of the reduction of the density of states.
Fujiyama Shigeki
Kanoda Kazushi
Kato Reizo
Kosaka Y.
Shitade Atsuo
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