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Universality of the Mott–Ioffe–Regel limit in metals

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Hussey ‖, N. E., Takenaka, K., Takagi, H.·2004·Philosophical Magazine

Abstract

The absence of resistivity saturation in many strongly correlated metals, including the high-temperature superconductors, is critically examined from the viewpoint of optical conductivity measurements. Coherent quasiparticle conductivity, in the form of a Drude peak centred at zero frequency, is found to disappear as the mean free path (at ω = 0) becomes comparable with the interatomic spacing. This basic loss of coherence at the so-called Mott–Ioffe–Regel (MIR) limit suggests that the universality of the MIR criterion is preserved even in the presence of strong electron correlations. We argue that the shedding of spectral weight at low frequencies, induced by strong correlation effects, is the primary origin of the extended positive slope of the resistivity to high temperatures observed in all so-called ‘bad metals’. Moreover, in common with those metals which exhibit resistivity saturation at high temperatures, the scattering rate itself, as extracted from optical spectra, saturates at a value consistent with the MIR limit. We consider possible implications that this ceiling in the scattering rate may have for our understanding of transport within a wide variety of bad metals and suggest a better method for analysing their optical response.

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Metadata

Authors
Hussey ‖, N. E., Takenaka, K., & Takagi, H.
Venue
Philosophical Magazine
Published
2004-09-21
Volume
84
Issue
27
Pages
2847-2864
ISSN
  • 1478-6433 (ISSN-L)
  • 1478-6435
  • 1478-6443
OpenAlex
W1968738923
Cited by
352
References
33
FWCI
2.74
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Universality of the Mott–Ioffe–Regel limit in metals. https://app.cochat.ai/papers/10.1080/14786430410001716944
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Hussey ‖, N. E., Takenaka, K., & Takagi, H. (2004). Universality of the Mott–Ioffe–Regel limit in metals. Philosophical Magazine. https://doi.org/10.1080/14786430410001716944

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