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Charge density wave fluctuations in La2-xSrxCuO4 and their competition with superconductivity

DOI: 10.1103/PhysRevB.89.224513 DOI Help

Authors: Tom Croft (University of Bristol) , Christopher Lester (University of Bristol) , Mark Senn (Diamond Light Source) , Alessandro Bombardi (Diamond Light Source) , Stephen Hayden (University of Bristol)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 89 (22)

State: Published (Approved)
Published: June 2014

Abstract: We report hard (14 keV) x-ray diffraction measurements on three compositions (x=0.11,0.12,0.13) of the high-temperature superconductor La2-xSrxCuO4. 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). The CDW is strongest with the longest in-plane correlation length near 1/8 doping. On entering the superconducting state the CDW is suppressed, demonstrating the strong competition between the charge order and superconductivity. CDW order coexists with incommensurate magnetic order and wavevectors of the two modulations have the simple relationship $\delta_{charge}= 2\delta_{spin}$. The intensity of the CDW Bragg peak tracks the intensity of the low-energy (quasi-elastic) spin fluctuations. We present a phase diagram of La2-xSrxCuO4 including the pseudogap phase, CDW and magnetic order.

Subject Areas: Physics


Instruments: I16-Materials and Magnetism