Regensburg 2002 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Tiefe Temperaturen

TT 22: Postersitzung III: Syst. korr. Elektr.: Theorie II (1-15), Metall-Isol.- und Phasenüberg
änge (16-33), SL: Massivmat., Bandl., Pinning, Vortexdyn., Transport, Korngr. (34-43), Niedrigdim. Syst., Magnetotransport (44-63)

TT 22.32: Poster

Donnerstag, 14. März 2002, 14:00–17:30, A

Stripe conductivity in La2−xSrxNiO4 obtained from electronic Raman scattering — •P. Lemmens3,4, V. Gnezdilov1, Yu. Pashkevich2, K.-Y. Choi4, G. Güntherodt4, J.M. Tranquada5, D.J. Buttrey6, and K. Nakajima71B.I. Verkin Inst. for Low Temp. Physics NASU, Kharkov, Ukraine — 2A.A.Galkin Donetsk Phystech NASU, Donetsk, Ukraine — 3IMNF, TU Braunschweig, Mendelsohnstr. 3, Braunschweig, Germany — 42. Phys. Inst. RWTH Aachen, Aachen Germany — 5BNL, Upton, NY, USA — 6Univ. of Delaware, Newark, Delaware, USA — 7ISSP Tokyo, Tokai, Ibaraki, Japan

We report the results of electronic Raman scattering experiments on La2−xSrxNiO4 with x = 1/3 and x=0.225 that exhibit commensurate and incommensurate charge-stripe order with one or less than 1 hole per Ni site along the stripe, respectively. Markedly different Raman response is observed in the B2g symmetry component. A charge ordering induced shift of spectral weight and pseudo gap formation is investigated. It is used to pinpoint a remnant conductivity along the charge threads in the incommensurate stripe-ordered state.
We acknowledge support by DFG SPP1073, NATO and INTAS.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2002 > Regensburg