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DESCRIPTION:Stephen Wilson\, Boston College\n\nAn unusual manifestation of
Mott physics dependent on strong spin-orbit interactions has recently been
identified in a growing number of classes of 5d transition metal oxides b
uilt from Ir4+ ions. Instead of the naively expected increased
itinerancy of these iridates due to the larger orbital extent of their 5d
valence electrons\, the interplay between the amplified relativistic spin-
orbit interaction (intrinsic to large Z iridium cations) and their residua
l on-site Coulomb interaction U\, conspires to stabilize a novel class of
spin-orbit assisted Mott insulators with a proposed Jeff=1/2 gr
ound state wavefunction. The identification of this novel spin-orbit Mott
state has been the focus of recent interest due to its potential of hostin
g a variety of new phases driven by correlated electron phenomena (such as
high temperature superconductivity or enhanced ferroic behavior) in a str
ongly spin-orbit coupled setting. Currently\, however\, there remains very
little understanding of how spin-orbit Mott phases respond to carrier dop
ing and\, more specifically\, how relevant U remains for the charge carrie
rs of a spin-orbit Mott phase once the bandwidth is increased. Here I will
present our group’s recent experimental work exploring carrier doping a
nd the resulting electronic phase behavior in one such spin-orbit driven M
ott material\, Sr3Ir2O7\, with the ultima
te goal of determining the relevance of U and electron correlation effects
within the doped system’s ground state. Our results reveal the stabiliz
ation of an electronically phase separated ground state in B-site doped Sr
3Ir2O7\, suggestive of an extended regime
of localization of in-plane doped carriers within the spin-orbit Mott pha
se. This results in a percolative metal-to-insulator transition with a nov
el\, global\, antiferromagnetic order. The electronic response of B-site d
oping in Sr3Ir2O7 will then be compared w
ith recent results exploring A-site doping of electrons into the system an
d the resulting electronic phase diagrams discussed.
DTSTART:20140417T193000Z
LOCATION:Physics Building\, Room 204
SUMMARY:Looking beyond the spin-orbit Mott phase
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