Two-Dimensional Orbital-Like Magnetic Order in the High-Temperature ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ Superconductor

Two-Dimensional Orbital-Like Magnetic Order in the High-Temperature ${La}_{2 - x} {Sr}_{x} {CuO}_{4}$ Superconductor

V. Balédent, B. Fauqué, Y. Sidis, N. B. Christensen, S. Pailhès, K. Conder, E. Pomjakushina, J. Mesot, and P. Bourges

Phys. Rev. Lett. 105, 027004 – Published 7 July 2010

Abstract

In high-temperature copper oxide superconductors, a novel magnetic order associated with the pseudogap phase has been identified in two different cuprate families over a wide region of temperature and doping. We report here the observation below 120 K of a similar magnetic ordering in the archetypal cuprate ${La}_{2 - x} {Sr}_{x} {CuO}_{4}$ (LSCO) system for $x = 0.085$ . In contrast with the previous reports, the magnetic ordering in LSCO is only short range with an in-plane correlation length of $\sim 10 Å$ and is bidimensional (2D). Such a less pronounced order suggests an interaction with other electronic instabilities. In particular, LSCO also exhibits a strong tendency towards stripes ordering at the expense of the superconducting state.

Received 19 March 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.027004

Authors & Affiliations

V. Balédent¹, B. Fauqué^1,†, Y. Sidis¹, N. B. Christensen², S. Pailhès^1,2, K. Conder², E. Pomjakushina², J. Mesot², and P. Bourges^1,*

¹Laboratoire Léon Brillouin, CEA-CNRS, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
²ETH Zurich and Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

^*To whom correspondence should be addressed. philippe.bourges@cea.fr
^†Present address: LPEM (UPMC-CNRS), ESPCI, 75005 Paris, France.

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Vol. 105, Iss. 2 — 9 July 2010

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Figure 1
Raw data in the spin-flip (SF) channel for a neutron polarization $H ∥ Q$ . (a) diagonal scans along the (1, $- 1$ ) direction around $Q = (1, 0, L)$ at different temperatures for $L = 0$ and $L = 0.5$ . (b) longitudinal scans along the (1,0) direction around $Q = (1, 0, 0.45)$ . (c) Temperature dependence of neutron intensity (SF) at $Q = (1, 0, 0.5)$ (red circles) and at a background position $Q = (0.8, 0.2, 0.5)$ (black dots). For all figures, yellow areas represent the magnetic signal. The typical counting time is about 1 h per point in order to get sufficient statistics.Reuse & Permissions
Figure 2
Difference of measurements performed at 30 K and 120 K for a neutron polarization $H ∥ Q$ . (a)–(c) Scans in the spin-flip channel: (a) Around $Q = (1, 0, 0)$ along a diagonal direction (1, $- 1$ ), (b) around $Q = (1, 0, 0.93)$ along $a^{*}$ . are Gaussian fits, a slight shift of the peak maximum to 1.03 is typically obtained. (c) Around $Q = (0, 0, 3.65)$ along $a^{*}$ . (d) Scan in the non-spin-flip channel around $Q = (1, 0, 0.5)$ along the diagonal direction (1, $- 1$ ). (e) $L$ dependence of the magnetic intensity (background substracted) determined from the various $Q$ scans measured across the $Q = (1, 0, L)$ in the SF channel. The line across the points is a guide to the eye.Reuse & Permissions
Figure 3
(a) Polarization analysis of the difference of scans measured at 30 and 120 K in the spin-flip channel around $Q = (1, 0, 0)$ along a diagonal direction (1, $- 1$ ). The neutron polarization is applied successively along three different directions $H_{α}$ . The label $α$ correspond to the Cartesian axis ${x, y, z}$ , so that the $x$ axis is parallel to $Q$ , while the $z$ axis stands for the direction perpendicular to the scattering plane. (b) Temperature dependence of $Q$ -integrated magnetic intensity, $S_{mag}$ .Reuse & Permissions
Figure 4
Unpolarized inelastic neutron scattering measurements of the IC magnetic fluctuations around $Q_{IC} = Q_{AF} \pm (δ, 0)$ : (a) Temperature dependence of the spin susceptibility at an energy of 4 meV: $Im χ (Q_{IC}, ℏ ω = 4 meV)$ . The inset represents the location of the different magnetic response in the a-b plane: $Q = 0$ AFO and IC spin fluctuations are shown in red and black, respectively. (b) Temperature dependence of the IC parameter $δ$ . In (a) and (b), the vertical dashed line indicates $\sim T_{mag}$ . (c) Typical $H$ -scans across IC spin excitations at $ℏ ω = 4 meV$ . The figure shows the imaginary part of the dynamical magnetic susceptibility $Im χ (Q, ℏ ω)$ at 30 K (full circles) and at 150 K (open triangles). (d) Schematic picture of the ${CuO}_{2}$ plane for a hole doping of $1 / 12$ based on the bond centered stripes model discussed in ref. [12].Reuse & Permissions

Physical Review Letters

Two-Dimensional Orbital-Like Magnetic Order in the High-Temperature La2−xSrxCuO4 Superconductor

V. Balédent, B. Fauqué, Y. Sidis, N. B. Christensen, S. Pailhès, K. Conder, E. Pomjakushina, J. Mesot, and P. Bourges

Phys. Rev. Lett. 105, 027004 – Published 7 July 2010

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Two-Dimensional Orbital-Like Magnetic Order in the High-Temperature ${La}_{2 - x} {Sr}_{x} {CuO}_{4}$ Superconductor