Evidence for Insulating Behavior in the Electric Conduction of (NH$_3$)K$_3$C$_{60}$ Systems

Details Evidence for Insulating Behavior in the Electric Conduction of (NH$_3$)K$_3$C$_{60}$ Systems Evidence for Insulating Behavior in the Electric Conduction of (NH$_3$)K$_3$C$_{60}$ Systems

2002-01-29

arxiv.org/abs/cond-mat/0201525v1

Phys. Rev. Lett. 88, 096401 (2002)

Physics

Condensed Matter

Superconductivity

accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.88.096401

Microwave study using cavity perturbation technique revealed that the conductivity of antiferromagnet (NH$_3$)K$_{3-x}$Rb$_x$C$_{60}$ at 200K is already 3-4 orders of magnitude smaller than those of superconductors, K$_3$C$_{60}$ and (NH$_3$)$_x$NaRb$_2$C$_{60}$, and that the antiferromagnetic compounds are {\it insulators} below 250K without metal-insulator transitions. The striking difference in the magnitude of the conductivity between these materials strongly suggests that the Mott-Hubbard transition in the ammoniated alkali fullerides is driven by a reduction of lattice symmetry from face-centered-cubic to face-centered-orthorhombic, rather than by the magnetic ordering.

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