Electronic states in Rb 1 C 60 studied by EPR under pressure: 3D Mott-Hubbard system
Physical Review B(2000)
摘要
Electron paramagnetic resonance (EPR) is applied to orthorhombic ${\mathrm{Rb}}_{1}{\mathrm{C}}_{60}$ 1D polymer under hydrostatic pressure. The EPR linewidth is interpreted in terms of Elliott mechanism. EPR signal intensity provides us the antiferromagnetic transition temperature ${T}_{\mathrm{N}}$ where the intensity drops suddenly. Finally, a phase diagram of the electronic states in $o{\ensuremath{-}\mathrm{R}\mathrm{b}}_{1}{\mathrm{C}}_{60}$ is constructed from ${T}_{\mathrm{N}}$ vs pressure diagram, along with the resistivity under pressure, reported by Khazeni et al. [Phys. Rev. B 56, 6627 (1997)]. From this diagram we can definitely conclude that $o{\ensuremath{-}\mathrm{R}\mathrm{b}}_{1}{\mathrm{C}}_{60}$ is not a SDW system typical for 1D electronic band, but a 3D Mott-Hubbard insulator near a border of the transition.
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关键词
electronic states,epr,mott-hubbard
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