Electron scattering, charge order, and pseudogap physics inLa1.6−xNd0.4SrxCuO4: An angle-resolved photoemission spectroscopy s

Abstract

We report an angle-resolved photoemission study of the charge stripe ordered La1.6−xNd0.4SrxCuO4 system.A comparative and quantitative line shape analysis is presented as the system evolves from the overdoped regime into the charge ordered phase. On the overdoped side (x = 0.20), a normal state anti-nodal spectral gap opens upon cooling below 80 K. In this process spectral weight is preserved but redistributed to larger energies. A correlation between this spectral gap and electron scattering is found. A different lineshape is observed in the antinodal region of charge ordered Nd-LSCO x = 1/8. Significant low-energy spectral weight appears to be lost. These observations are discussed in terms of spectral weight redistribution and gapping originating from charge stripe ordering.

Fermi-surface transformation across the pseudogap critical point of the cuprate superconductor La1.6−xNd0.4SrxCuO4

“…At p = 0.24, Matt et al observe no gap at all, confirming that the pseudogap phase begins below p = 0.24 [29]. Again, this is perfectly consistent with transport data (Fig.…”

“…Recently, Matt et al reported ARPES measurements on Nd-LSCO that confirm this interpretation [29]. They observe a partial anti-nodal gap at p = 0.20, in the normal state just above T c .…”

“…The red square at p = 0.20 is the onset temperature for the opening of the pseudogap in Nd-LSCO, as measured by ARPES [29]. At p = 0.24, the same ARPES study detects no pseudogap, down to Tc [29]. We can therefore identify the red dashed line as the pseudogap temperature T , and p (red diamond) as the T = 0 critical point of the pseudogap phase.…”

“…4). The red square at p = 0.20 is the onset temperature for the opening of the pseudogap in Nd-LSCO, as measured by ARPES [29]. At p = 0.24, the same ARPES study detects no pseudogap, down to Tc [29].…”

“…As we shall see, this is really what proves that the upturns are due to a loss of carrier density. An important advantage of Nd-LSCO is that the opening of the pseudogap measured spectroscopically (by ARPES) [29] coincides with the start of the upturn in ρ(T ) [27], as a function of doping and temperature, thereby linking the transport anomalies directly to the pseudogap phase (Fig. 1).…”