Ultrahigh vacuum three-axis cryogenic sample manipulator for angle-resolved photoelectron spectroscopy

Abstract

An ultrahigh vacuum three-axis cryogenic sample manipulator suitable for angle-resolved photoelectron spectroscopy experiments was developed. The sample manipulator is constructed by combining three modules with translation, polar rotation, and azimuthal-tilt rotation capabilities. Polar rotation and the azimuthal-tilt rotation are performed using a differentially pumped rotary stage and a sample goniometer, respectively. Continuous 360° rotation around the polar axis is possible. The sample goniometer is capable of azimuthal rotation of up to ±180° and tilt rotation from +95° to −5°, measured from the plane normal to the polar axis. Nonmagnetic materials are used near the sample holder of the goniometer. The sample holder can be cooled using a continuous-flow cryostat. To serve as a radiation shield, the lower portion of the goniometer surrounding the sample holder is cooled separately by another cell filled with liquid nitrogen. With liquid nitrogen or liquid helium for the cryostat, the sample holder can be cooled down to 90 or 12.5 K, respectively.

Differences in the high-energy kink between hole- and electron-doped high-Tcsuperconductors

“…The T c of NCCO was ∼22 K. The ARPES measurements were performed at beamline 28A of Photon Factory (PF), Institute of Materials Structure Science, High Energy Accelerators Research Organization (KEK), using circularlypolarized light with energies of 55 eV and 100 eV. We used a SCIENTA SES-2002 electron-energy analyzer and a five-axis manipulator [29]. The total energy resolution and angular resolution were 15-60 meV and 0.2…”

Orbital selectivity of the kink in the dispersion ofSr2RuO4

“…The sample goniometer provides independent polar and tilt rotations of the sample (R-Dec Co. Ltd., i GONIO LT). 30 The beamline is equipped with a high-resolution, hemispherical electron analyzer (SCIENTA ESCA200). In order to obtain clean surfaces, 19 we cleaved the samples in situ in ultrahigh vacuum better than 1 × 10 −10 Torr at 10 K. A surface state near the M point due to the rotation of RuO 6 octahedra at the surface was observed for the fresh surface, 25,26 but was almost eliminated by aging the sample surface in situ.…”

High-resolution angle-resolved photoemission study of bulk electronic states in

“…ARPES measurements have been done using a VG-SCIENTA SES2002 spectrometer with a 5-axis manipulator (R-Dec, i GONIO) [19] at a newly developed BL28 beamline in Photon Factory (PF), KEK, Tsukuba. We used circularly polarized lights.…”