Low Temperature Physics: 28, 510 (2002); https://doi.org/10.1063/1.1496659 (6 pages)
Физика Низких Температур: Том 28, Выпуск 7 (Июль 2002), c. 716-723    ( к оглавлению , назад )

Electronic Raman scattering through a stripe ordering transition in La2-xSrxNiO4

V. P. Gnezdilov, Yu. G. Pashkevich2

B. Verkin Institute for Low Temperature Physics and Engineering of the NAS of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
2A. Galkin Donetsk Physico-Technical Institute of the NAS of Ukraine 72 R. Luxemburg Str., Donetsk 83114, Ukraine
E-mail: gnezdilov@ilt.kharkov.ua

A. V. Yeremenko

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine

P. Lemmens

Physikalisches Institut, RWTH Aachen, Aachen 52056, Germany

G. Güntherodt4, J. M. Tranquada4, D. J. Buttrey5, and K. Nakajima6

4Brookhaven National Laboratory, Upton, NY 11973
5University of Delaware, Newark, Delaware 19716
6Neutron Scattering Laboratory ISSP, University of Tokyo, Tokai, Ibaraki, Japan

Received February 28, 2002

Аннотация

We describe the results of electronic Raman scattering experiments in two differently doped single crystals of La2-xSrx NiO4 (x = 0.225 and 1/3). In B1g symmetry a crossover from weakly interacting to pseudogap-like behavior is observed at a charge-ordering temperature Tco. In B2g symmetry a redistribution of electronic continua with decreasing temperature is accompanied by a loss of spectral weight below Tco in the low-frequency region due to opening of a pseudogap. The slope of the Raman response at vanishing frequencies is investigated, too. Its temperature behavior in B2g symmetry, which predominantly selects charge carriers with momenta along the diagonals of the NiO2 bonds, provides clear evidence for one-dimensional charge transport in the charge-ordered phase.

PACS:
78.30.-j - Infrared and Raman spectra (for vibrational states in crystals and disordered systems, see 63.20.-e and 63.50.+x respectively)