Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Superconductivity: Properties and Electronic Structure

TT 17.10: Vortrag

Montag, 16. März 2015, 17:30–17:45, H 2053

Charge density wave fluctuations in La_2−xSr_xCuO₄ and their competition with superconductivity — •Thomas Croft¹, Christopher Lester¹, Alessandro Bombardi², Mark Senn², and Stephen Hayden¹ — ¹H. H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, United Kingdom — ²Diamond Light Source Ltd., Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom

The recent observations of charge and stripe correlations in YBa₂Cu₃O_6+x and La_2−xBa_xCuO₄ has reinvigorated interest in their role in influencing the superconductivity of the cuprates. However, structural complications of these systems makes it difficult to isolate the effect the lattice has in inducing the charge order.

Here, we report hard x-ray diffraction measurements on three compositions (x=0.11,0.12,0.13) of the high-temperature superconductor La_2−xSr_xCuO₄, a canonical example of HTS with T_c≈ 35 K and a simple crystal structure. All samples show charge-density-wave (CDW) order with onset temperatures in the range 51-80 K and ordering wavevectors close to (0.23,0,0.5). We present a phase diagram of La_2−xSr_xCuO₄ including the pseudogap phase, CDW and magnetic order.