tag:blogger.com,1999:blog-5439168179960787195.post3047664415435494023..comments2024-03-28T17:13:01.117+10:00Comments on Condensed concepts: How good metals turn badRoss H. McKenziehttp://www.blogger.com/profile/09950455939572097456noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-5439168179960787195.post-21503393328578146392012-10-18T16:48:52.611+10:002012-10-18T16:48:52.611+10:00Hi Andrew,
This is a good question.
For the organi...Hi Andrew,<br />This is a good question.<br />For the organics I think the relevant temperature ranges are<br />T < 20 K<br />Fermi liquid with T^2 resistivity<br />20 K < T < 50 K<br />Resilient quasi-particles<br />Drude peak in optical conductivity<br />Thermopower increases monotonically with temperature<br />Resistivity increases rapidly with temperature, faster than T^2<br />50 K < T < 100 K<br />bad metal<br />No Drude peak in optical conductivity<br />Thermopower DEcreases monotonically with temperature<br />Resistivity is larger than Mott-Ioffe-Regel limit<br /><br />What causes the peak in resistivity at 100 K in the organics is controversial. <br />Some sample dependence is observed.<br />But DMFT calculations do give such a peak when close to the Mott transition Ross H. McKenziehttps://www.blogger.com/profile/09950455939572097456noreply@blogger.comtag:blogger.com,1999:blog-5439168179960787195.post-45275490610496050372012-10-18T13:26:01.358+10:002012-10-18T13:26:01.358+10:00That is a really interesting observation. Does it ...That is a really interesting observation. Does it mean in simple words there is a state between "good metal" (fermi liquid) and "bad metal" state: "resilient quasiparticles" state? And very naive connection with resistivity plot for organic superconductors: a hump ~100K is bad metal-resilient quasiparticles transition, and starting rho~T^2 (~50K) is a resilient quasiparticles-fermi liquid transition, am I wrong?<br /><br />/Andrew BardinAndrey Alex Bardinhttps://www.blogger.com/profile/05835477921979485079noreply@blogger.com