TY - JOUR
T1 - Electron-phonon anomaly related to charge stripes
T2 - Static stripe phase versus optimally doped superconducting La 1.85Sr 0.15 CuO 4
AU - Reznik, Dmitri
AU - Pintschovius, L.
AU - Fujita, M.
AU - Yamada, K.
AU - Gu, G. D.
AU - Tranquada, J. M.
N1 - Funding Information:
Work at Brookhaven is supported by the Office of Science, U.S. Department of Energy, under Contract No. DE-AC02-98CH10886.
PY - 2007/5
Y1 - 2007/5
N2 - Inelastic neutron scattering was used to study the Cu-O bond-stretching vibrations in optimally doped La 1.85Sr 0.15 CuO 4(T c = 35 K) and in two other cuprates showing static stripe order at low temperatures, i.e., La 1.48 Nd 0.4Sr 0.12CuO 4 and La 1.875 Ba 0.125CuO 4. All three compounds exhibit a very similar phonon anomaly, which is not predicted by conventional band theory. It is argued that the phonon anomaly reflects a coupling to charge inhomogeneities in the form of stripes, which remain dynamic in superconducting La 1.85Sr 0.15CuO 4 down to the lowest temperatures. These results show that the phonon effect indicating stripe formation is not restricted to a narrow region of the phase diagram around the so-called 1/8 anomaly but occurs in optimally doped samples as well.
AB - Inelastic neutron scattering was used to study the Cu-O bond-stretching vibrations in optimally doped La 1.85Sr 0.15 CuO 4(T c = 35 K) and in two other cuprates showing static stripe order at low temperatures, i.e., La 1.48 Nd 0.4Sr 0.12CuO 4 and La 1.875 Ba 0.125CuO 4. All three compounds exhibit a very similar phonon anomaly, which is not predicted by conventional band theory. It is argued that the phonon anomaly reflects a coupling to charge inhomogeneities in the form of stripes, which remain dynamic in superconducting La 1.85Sr 0.15CuO 4 down to the lowest temperatures. These results show that the phonon effect indicating stripe formation is not restricted to a narrow region of the phase diagram around the so-called 1/8 anomaly but occurs in optimally doped samples as well.
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U2 - 10.1007/s10909-007-9318-9
DO - 10.1007/s10909-007-9318-9
M3 - Article
AN - SCOPUS:33947631428
VL - 147
SP - 353
EP - 364
JO - Journal of Low Temperature Physics
JF - Journal of Low Temperature Physics
SN - 0022-2291
IS - 3-4
ER -