Electron scattering, charge order, and pseudogap physics in ${\mathrm{La}}_{1.6\ensuremath{-}x}{\mathrm{Nd}}_{0.4}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$: An angle-resolved photoemission spectroscopy study

Electron scattering, charge order, and pseudogap physics in ${La}_{1.6 - x} {Nd}_{0.4} {Sr}_{x} {CuO}_{4}$ : An angle-resolved photoemission spectroscopy study

C. E. Matt et al.

Phys. Rev. B 92, 134524 – Published 27 October 2015

Abstract

We report an angle-resolved photoemission study of the charge stripe ordered ${La}_{1.6 - x} {Nd}_{0.4} {Sr}_{x} {CuO}_{4}$ (Nd-LSCO) 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 antinodal 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 line shape 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.

Received 7 August 2014
Revised 24 August 2015

DOI:https://doi.org/10.1103/PhysRevB.92.134524

Authors & Affiliations

Click to Expand

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 92, Iss. 13 — 1 October 2015

Reuse & Permissions

Access Options

Article Available via CHORUS

Download Accepted Manuscript

Author publication services for translation and copyediting assistance advertisement

Images

Figure 1
(a) Temperature-doping phase diagram of ${La}_{1.6 - x} {Nd}_{0.4} {Sr}_{x} {CuO}_{4}$ (Nd-LSCO), established by diffraction and resistivity experiments [31, 34, 35, 36, 37]. The temperature scale $T_{ρ}$ is determined by the deviation from high-temperature linear resistivity [34]. The charge ordering temperature ( $T_{c h}$ ) is obtained from x-ray diffraction [31, 36, 37]. All lines are guides to the eye. (b) Charge stripe order parameter $Δ_{c h}$ , derived from hard x-ray diffraction experiments on ${La}_{2 - x} {Ba}_{x} {CuO}_{4}$ (LBCO) [38]. (c) Leading edge gap of LBCO vs doping, from Ref. [39].
Reuse & Permissions
Figure 2
(a)–(d) Antinodal angle-resolved photoemission spectra, taken in the normal state of ${La}_{1.6 - x} {Nd}_{0.4} {Sr}_{x} {CuO}_{4}$ for different dopings $p = x$ as indicated. Solid white points are momentum distribution curves at the Fermi level, indicated by horizontal dashed lines. Top panels schematically show the Fermi-surface topology for each of the doping concentrations. The red lines indicate the trajectory along which the antinodal spectra were recorded. Solid black points indicate the underlying Fermi momenta at which symmetrized EDCs are shown in Figs. 3 and 3.
Reuse & Permissions
Figure 3
Symmetrized normal-state energy-distribution curves (EDCs) recorded on ${La}_{2 - x} {Sr}_{x} {CuO}_{4}$ (LSCO) and ${La}_{1.6 - x} {Nd}_{0.4} {Sr}_{x} {CuO}_{4}$ (Nd-LSCO). All spectra were taken just above $T_{c}$ . (a)–(f) Raw symmetrized spectra; (g)–(l) background-subtracted spectra. (a),(b) Symmetrized EDCs taken in the antinodal region, for doping concentrations of LSCO and Nd-LSCO as indicated. ARPES data on LSCO $x = 0.105$ and 0.145 were previously presented in Refs. [51, 52, 53] and all LSCO samples were characterized by neutron-scattering experiments [54, 55, 56]. (c),(d) Momentum dependence of symmetrized energy-distribution curves (EDCs) taken at $k_{F}$ moving from antinodal (bottom) to nodal (top) region for Nd-LSCO $p = 0.12$ and 0.20. (e),(f) Temperature dependence of antinodal symmetrized EDCs recorded on Nd-LSCO $p = 0.12$ and 0.20. For clarity, each spectrum has been given an arbitrary vertical shift. Solid lines in bottom panels are fits; see text for an explanation.
Reuse & Permissions
Figure 4
Comparison of antinodal spectra at $T \sim 20$ K (blue) and 75 K (red). (a),(b) Raw energy-distribution curves recorded at $k_{F}$ on Nd-LSCO $p = 0.12$ and 0.20 with the respective background intensities, measured at momenta far from $k_{F}$ . (c),(d) The respective background-subtracted curves are compared.
Reuse & Permissions
Figure 5
Normal-state gap $Δ$ vs the scattering rate $Γ$ . Both quantities were extracted by fitting background-subtracted symmetrized energy-distribution curves along the underlying Fermi surface of Nd-LSCO $p = 0.12$ , 0.20, and 0.24, as well as antinodal spectra vs temperature. The fitting procedure is explained in the text. Gray shaded area indicates schematically the correlation between the normal-state gap and the electron scattering.
Reuse & Permissions
Figure 6
Comparison of antinodal spectra recorded on different surfaces of Nd-LSCO $p = 0.12$ at $T = 80$ K. (a) Raw spectra at $k_{F}$ and at momentum $k_{B G}$ , representing the extrinsic background. Intensities have been normalized so that the background intensities match across different experiments. In this fashion, it is shown how the same spectral line shape can appear different due to a different signal-to-background ratio. Spectra, at $T \sim 80$ K, were taken after cleaving at $T = 20$ K (black) and at 80 K (red). (b) Background-subtracted spectra, scaled by an arbitrary constant.
Reuse & Permissions

Physical Review B

covering condensed matter and materials physics

Electron scattering, charge order, and pseudogap physics in ${La}_{1.6 - x} {Nd}_{0.4} {Sr}_{x} {CuO}_{4}$ : An angle-resolved photoemission spectroscopy study

C. E. Matt et al.

Phys. Rev. B 92, 134524 – Published 27 October 2015

Abstract

Authors & Affiliations

Article Text (Subscription Required)

References (Subscription Required)

Issue

Access Options

Physical Review B

covering condensed matter and materials physics

Electron scattering, charge order, and pseudogap physics in La1.6−xNd0.4SrxCuO4: An angle-resolved photoemission spectroscopy study

C. E. Matt et al.

Phys. Rev. B 92, 134524 – Published 27 October 2015

Abstract

Authors & Affiliations

Article Text (Subscription Required)

References (Subscription Required)

Issue

Access Options

Authorization Required

Other Options

Download & Share

Images

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Log In

Search

Article Lookup

Paste a citation or DOI

Enter a citation

Electron scattering, charge order, and pseudogap physics in ${La}_{1.6 - x} {Nd}_{0.4} {Sr}_{x} {CuO}_{4}$ : An angle-resolved photoemission spectroscopy study