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DESCRIPTION:Zhiqiang Mao \, Tulane University \n\n Perovskite ruthenates (S
r\,Ca) n+1 Ru n O 3n+1 exhibit a ric
h variety of fascinating ordered ground states. Spin-triplet superconducti
vity\, metamagnetic quantum criticality\, itinerant ferromagnetism\, antif
erromagnetic Mott insulating\, and half-metallic behavior were all found i
n close proximity to one another. These diverse ground states originate fr
om the strong interplay of charge\, spin\, lattice\, and orbital degrees o
f freedom. They offer a unique opportunity to tune the system and study t
he physics of novel quantum phases. In this talk\, I will first give a bri
ef overview on studies in this area\, and then present our recent work on
double layered ruthenates (Sr 1-x Ca x ) 3
Ru 2 O 7 (0 ≤\; x ≤\; 1). We h
ave established a magnetic phase diagram for this system using the high qu
ality single crystals grown by the floating-zone technique\; this phase di
agram exhibits significant new phenomena. We find a very unique magnetic s
tate in close proximity to a two-dimensional ferromagnet with T c
sub> =0 K for 0.1 < x < 0.4. This state exhibits a surprisingly large Wils
on ratio RW (e.g. R W ≈\; 700 for x = 0.2)\; it freezes
into a cluster glass (CG) at low temperatures. Furthermore\, we observe e
vidence of non-Fermi liquid behavior as the frozen temperature of the CG p
hase approaches zero near x = 0.1. The origin of such a state will be dis
cussed. \n\n
DTSTART:20080320T200000Z
LOCATION:Physics Building\, Room 204
SUMMARY:Fascinating Exotic Phenomena in Layered Ruthenates
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