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Instruments / Technical Area	Publication Details	Published
I16-Materials and Magnetism	Precise control of J eff = 1/2 magnetic properties in Sr2IrO4 epitaxial thin films by variation of strain and thin film thickness Stephan Geprags , Bjorn Erik Skovdal , Monika Scheufele , Matthias Opel , Didier Wermeille , Paul Thompson , Alessandro Bombardi , Virginie Simonet , Stephane Grenier , Pascal Lejay , Gilbert Andre Chahine , Diana Lucia Quintero-Castro , Rudolf Gross , Danny Mannix Physical Review B 102 DOI: 10.1103/PhysRevB.102.214402 Diamond Proposal Number(s): [12770] Show Abstract ▼ Abstract: We report on a comprehensive investigation of the effects of strain and film thickness on the structural and magnetic properties of epitaxial thin films of the prototypal J eff = 1 / 2 compound Sr 2 IrO 4 by advanced x-ray scattering. We find that the Sr 2 IrO 4 thin films can be grown fully strained up to a thickness of 108 nm. By using x-ray resonant scattering, we show that the out-of-plane magnetic correlation length is strongly dependent on the thin film thickness, but independent of the strain state of the thin films. This can be used as a finely tuned dial to adjust the out-of-plane magnetic correlation length and transform the magnetic anisotropy from two-dimensional to three-dimensional behavior by incrementing film thickness. These results provide a clearer picture for the systematic control of the magnetic degrees of freedom in epitaxial thin films of Sr 2 IrO 4 and bring to light the potential for a rich playground to explore the physics of 5 d transition-metal compounds.	Dec 2020
	Resonant x-ray scattering investigation of magnetic ordering in NpAs1 − xSex (x = 0.05, 0.10) V. H. Rodriguez , J. A. Paixao , M. M. R. Costa , D. Mannix , A. Bombardi , J. Rebizant , G. H. Lander Journal Of Physics: Condensed Matter 23 (2) DOI: 10.1088/0953-8984/23/2/026002 Show Abstract ▼ Abstract: A resonant x-ray scattering investigation of the NpAs1 − xSex system with single crystals of 5 and 10% Se content is reported. The main features of the magnetic phase diagram previously studied by neutron scattering were confirmed. The coexistence within a single domain of ferro- and antiferro-components in the low-T ferrimagnetic phase was established, as well as the single-k character of the incommensurate phase and of the antiferromagnetic component of the ferrimagnetic phase. A tetragonal lattice distortion was found in the ferro- and ferrimagnetic phases which is not compatible with the proposed model for the ferromagnetic phase. The study of ferromagnetism was carried out using polarization analysis of the diffracted beam to separate the scattering intensities originating from magnetism and charge, which are superimposed in reciprocal space. The magnetic character of the ferromagnetic signal calculated from the measured intensities in the polarization analysis σπ and σσ channels was confirmed by analysis of the corresponding temperature dependence.	Dec 2010
	Evidence for two mechanisms of temperature-dependent "forbidden" resonant diffraction in ZnO S. P. Collins , D. Laundy , V. E. Dmitrienko , D. Mannix , P. Thompson Physica Scripta DOI: 10.1238/Physica.Topical.115a01065 Show Abstract ▼ Abstract: The resonance spectrum of glide-plane forbidden X-ray diffraction have been measured for different temperatures in hexagonal ZnO near the zinc K-edge. This diffraction appears exclusively owing to anisotropy of the Zn atomic scattering factor induced either by thermal motion or by a temperature-independent dipole-quadrupole amplitude. The results provide the first evidence for a complex line shape in the spectrum of thermal motion induced scattering, and the first observation of a dramatic change in resonance spectrum with temperature. The measurements are in excellent agreement with a phenomenological model, based on a combination of constant and a temperature-dependent amplitudes. This model has provided a means of extracting amplitude spectra of each component, and their relative phase. We find that the strongest spectral feature of the room-temperature resonance spectrum arises from a sudden phase change between the two resonant processes. These results are of great importance for better understanding of the temperature effect on the excited electronic states in crystals like hybridization of different orbitals, etc.	Jan 2005

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