Novel dielectric anomaly in the hole-doped La(2)Cu(1-x)Li(x)O(4) and La(2-x)Sr(x)NiO(4) insulators: signature of an electronic glassy state.
The low-frequency dielectric response of hole-doped insulators La(2)Cu(1-x)Li(x)O(4) and La(2-x)Sr(x)NiO(4) shows a large dielectric constant epsilon(') at high temperature and a steplike drop by a factor of 100 at a material-dependent low temperature T(f). T(f) increases with frequency, and the dielectric response shows universal scaling in a Cole-Cole plot, suggesting that a charge-glass state is realized both in the cuprates and in the nickelates.
Park
Tuson
T
Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Nussinov
Z
Z
Hazzard
K R A
KR
Sidorov
V A
VA
Balatsky
A V
AV
Sarrao
J L
JL
Cheong
S-W
SW
Hundley
M F
MF
Lee
Jang-Sik
JS
Jia
Q X
QX
Thompson
J D
JD