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

H. Kitano; R. Matsuo; K. Miwa; A. Maeda; T. Takenobu; Y. Iwasa; T. Mitani

doi:10.1103/PhysRevLett.88.096401

paper

Evidence for Insulating Behavior in the Electric Conduction of (NH $_{3}$ )K $_{3}$ C $_{60}$ Systems

arXiv:cond-mat/0201525 · doi:10.1103/PhysRevLett.88.096401

Abstract

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.

accepted for publication in PRL

References in corpus (1)

Role of dynamic Jahn-Teller distortions in Na2C60 and Na2CsC60 studied by NMR

Evidence for Insulating Behavior in the Electric Conduction of (NH3​)K3​C60​ Systems

Abstract

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Evidence for Insulating Behavior in the Electric Conduction of (NH $_{3}$ )K $_{3}$ C $_{60}$ Systems