Titel: LOREA: the ARPES beamline at ALBA Synchrotron
Abstract:
LOREA (flower in basque language), started its operation in 2021 and is dedicated to electronic structure investigation of quantum materials by means of Angle Resolved Photo-Emission Spectroscopy (ARPES).
The beamline covers the photon energy range of 10-1000 eV, with continuously variable polarization, resolving power of more than 104 in the whole range, and a spot size of about 10x10 μm2. The beamline allows to perform high resolution VUV ARPES as well as Soft X-ray ARPES and resonant PES. The MBS A-1 hemispherical electron analyser can be used in the deflector map mode to get isoenergy maps in the energy range 10-600eV, while ARPES is available in the 10-850eV range. The analyser includes an MBS spin manipulator and a Focus-VLEED spin detector to perform Spin-Resolved ARPES in all 6 components at once.
The 6-axes cryo-manipulator can reach low temperatures better than 7.5K and is provided with 4 electrical contacts for characterizing the ARPES samples with transport measurements and to perform "operando" experiments on simple devices with dimensions of the order of about 20 micrometers. The beam positioning is facilitated by a microscope looking at the sample surface in the direction collinear with the beam and with a spatial resolution of about 10μm.
The two preparation chambers allow to sputter clean surfaces and to deposit thin films of a wide range of materials, from noble metals to alkali, organic and rare earth elements. The presence of a plasma source gives a further possibility of cleaning surfaces and to grow oxides or nitrides. Atomic layer deposition (ALD) of oxides is also possible thanks to a customised ALD reactor attached to the main preparation chamber.
Although LOREA is a “young” beamline, an upgrade towards “nano-ARPES” is planned for the next years, when there will be the upgrade of ALBA to the 4th generation synchrotron ALBA-II. In this presentation I will show recent results, as well as the future plans.
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