Scientific Review: HEiDi: Single Crystal Diffractometer at the Hot Source of the FRM II

Determination of the magnetic order and the crystal symmetry in the multiferroic ground state of Ba2CoGe2O7Hutanu1, Sazonov2, Meven3 et al. 2012Phys. Rev. BSelf Cite342370View full textAdd to dashboardCite

“…15 This sample was studied at the neutron source Heinz Maier-Leibnitz (FRM II) on the hot four circle diffractometer HEiDi. 17 Using a Cu-(220) monochromator, one obtains a short wavelength of 0.87Å with a high flux density of >4.5 × 10 6 neutrons s −1 cm −2 . The extinction as a typical source of systematic errors is negligible small at this wavelength.…”

Temperature-dependent neutron diffraction studies on iron pnictide single crystals

“…Opechowski-Guccione-like symbols of magnetic space groups. Hans Grimmer, Laboratory for Developments and Methods, Research with Neutrons and Muons, Paul Scherrer Institut, Villigen, Switzerland E-mail: Hans.Grimmer@psi.ch For the magnetic space group types with black and white lattice two sets of symbols have been proposed: the BNS symbols [1] and the OG symbols [2]. Whereas generators of the group can be read off the BNS symbol, the International Tables for X-Ray Crystallography (1952) must be consulted to interpret the OG symbols in the cases where the black and white lattice is centred.…”

Structural, magnetic and magnetocaloric effect in the off-stoichimetric Gd5Ge2.05−xSi1.95−xMn2xalloys

“…Practical applications of the MCE, therefore, have the potential to reduce the global energy consumption and eliminate or minimize the use of ozonedepleting alloys, greenhouse gases, and precarious. After the discovery of the giant magnetocaloric effect in the Gd 5 Si 2 Ge 2 alloy, there has been much interest in the Gd 5 (Si x Ge 1-x ) 4 family alloys [1]. As seen in earlier studies, the stoichiometric Gd 5 Si 2 Ge 2 with doping alloys have not won with the appropriate of magnetocaloric features.…”

“…A complete recovery of the initial martensite state may bring about magnetoelasticity (two-way magnetic shape memory effect), while the irreversible magnetostructural transition would result in magnetoplasticity (one-way magnetic shape memory effect). We showed that the effects of the irreversibility of the magnetostructural transitions on magnetocaloric effect in the (Ni-Cu)-Mn-Sn compounds was very important by magnetic and resistance measurements under magnetic field [1]. The magnetic entropy change of the Ni 50-x Cu x Mn 36 Sn 14 (x=2 and 4) compounds are estimated by using Maxwell equation and the M(H) curves obtained from noncontinuous heating method.…”

“…The magnetic entropy changes are also estimated from DSC analysis for each alloy. The single crystal diffractometer (SCD) HEiDi at the hot source of the research neutron source Heinz Maier-Leibnitz (FRM II) was developed as a co-operation of the RWTH Aachen and the TU München [1]. The short neutron wavelengths (0,4 Å < λ < 1,2 Å) of the instrument allow detailed studies of nuclear structures and the magnetic order of compounds with similar or highly absorbing elements.…”