tag:blogger.com,1999:blog-5439168179960787195.post815207277857756825..comments2024-03-28T17:13:01.117+10:00Comments on Condensed concepts: Deconstructing electron-doped cupratesRoss H. McKenziehttp://www.blogger.com/profile/09950455939572097456noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-5439168179960787195.post-29402817427341134892011-08-10T00:32:46.907+10:002011-08-10T00:32:46.907+10:00Concerning "In particular there appears to be...Concerning "In particular there appears to be no pseudogap in the electron-doped materials and they are not as strongly correlated."<br /><br />I would add to Peter Armitage's comment that even at weak coupling a pseudogap can appear at finite T in two dimensions. In e-doped cuprates the optical pseudogap appears when the antiferromagnetic correlation length equals the thermal de Broglie wave length. A clear signature of the origin of the phenomenon. <br /><br />For the experiment see<br />http://www.nature.com/nature/journal/v445/n7124/full/nature05437.html<br /><br />AM TremblayAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-5439168179960787195.post-13964814235896464472011-08-08T13:27:13.921+10:002011-08-08T13:27:13.921+10:00Ross wrote:
"In particular there appears to ...Ross wrote:<br /><br />"In particular there appears to be no pseudogap in the electron-doped materials..."<br /><br />I wouldn't say this is really true, but to be precise it depends on what you mean by pseudogap. It is clear that there is a tremendous of low energy spectral weight suppression that seems to derive from p,p AFism (or other p,p order). If one associates similar PG features with density wave order (broadly construed) on the hole doped side, then there is a remarkable symmetry between the physics of two sides of the phase diagram.<br /><br />But it is true that there does not seem to be any signs of the "spin-gap"-type pseudogap of the sort found via the suppression of the spin susceptibility at high temperatures via NMR. It also looks that signs of scing fluctuations are weaker on the e-doped side of the phase diagram.<br /><br />There is a recent RMP that discusses alot of these issues in reasonable detail. :)<br /><br />http://rmp.aps.org/abstract/RMP/v82/i3/p2421_1Peter Armitagehttps://www.blogger.com/profile/11567089164372083820noreply@blogger.com