Observation of competing order in a high-Tc superconductor using femtosecond optical pulses.
We present studies of the photoexcited quasiparticle dynamics in Tl(2)Ba(2)Ca(2)Cu(3)O(y) (Tl-2223) using femtosecond optical techniques. Deep into the superconducting state (below 40 K), a dramatic change occurs in the temporal dynamics associated with photoexcited quasiparticles rejoining the condensate. This is suggestive of entry into a coexistence phase which, as our analysis reveals, opens a gap in the density of states (in addition to the superconducting gap), and furthermore, competes with superconductivity resulting in a depression of the superconducting gap.
Chia
Elbert E M
EE
MPA-CINT and T-11, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Zhu
Jian-Xin
JX
Talbayev
D
D
Averitt
R D
RD
Taylor
A J
AJ
Oh
Kyu-Hwan
KH
Jo
In-Sun
IS
Lee
S-I
SI