Local magnetic order in La2CuO4 seen via μ+SR spectroscopy

13th International Conference on Muon Spin Rotation, Relaxation and Resonance

Storchak, V.G.^1 ; Brewer, J.H.^2 ; Eshchenko, D.G.^3 ; Mengyan, P.W.^4 ; Parfenov, O.E.^1 ; Tokmachev, A.M.^1 ; Dosanjh, P.^2 ; Barilo, S.N.^5

Kurchatov Institute, Kurchatov Sq. 1, Moscow

123182, Russia^1

Department of Physics and Astronomy, University of British Columbia, Vancouver

BC

V6T 1Z1, Canada^2

Bruker BioSpin AG, Industriestrasse 26, Fallanden

8117, Switzerland^3

Department of Physics, Texas Tech University, Lubbock

TX

79409-1051, United States^4

Institute of Solid State and Semiconductor Physics, National Academy of Sciences of Belarus, Minsk

220072, Belarus^5

关键词: Antiferromagnetics;    Circulating current;    High magnetic fields;    High-Tc superconductivity;    Line splittings;    Magnetic orders;    Orbital magnetic moment;    Polarized neutron diffraction;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/551/1/012024/pdf
DOI  :  10.1088/1742-6596/551/1/012024

来源: IOP

【 摘 要 】

The origin of a pseudogap in the underdoped phase of cuprates has become one of the leading issues in understanding the mechanism(s) of high-Tc superconductivity. Several experiments (i.e. polarized neutron diffraction studies) support theoretical models based on the circulating current (CC) picture. These CC models suggest a novel ordered phase formed by orbital magnetic moments caused by spontaneous orbital currents. However to date, μSR experiments in cuprate superconductors have not revealed any magnetic field higher than 0.2 G associated with orbital moments. Here we present high magnetic field μSR spectroscopy of a stoichiometric La2CuO4 crystal which shows antiferromagnetic splittings and additional 45 G line splittings, consistent with orbital currents.