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The magnetization dynamics in diluted magnetic semiconductor heterostructures based on (Zn,Mn)Se and (Cd,Mn)Te has been studied experimentally by optical methods and simulated numerically. In the samples with nonhomogeneous magnetic ion…

Mesoscale and Nanoscale Physics · Physics 2015-05-19 A. A. Maksimov , D. R. Yakovlev , J. Debus , I. I. Tartakovskii , A. Waag , G. Karczewski , T. Wojtowicz , J. Kossut , M. Bayer

The magnetic susceptibility, crystal and magnetic structures, and electronic structure of double perovskite Sr2ScOsO6 are reported. Using both neutron and x-ray powder diffraction we find that the crystal structure is monoclinic P21/n from…

Strongly Correlated Electrons · Physics 2015-04-06 A. E. Taylor , R. Morrow , D. J. Singh , S. Calder , M. D. Lumsden , P. M. Woodward , A. D. Christianson

The magnetoelectric behavior of BiFeO$_3$ has been explored on the basis of accurate density functional calculations. The structural, electronic, magnetic, and ferroelectric properties of BiFeO$_3$ are predicted correctly without including…

Materials Science · Physics 2007-05-23 P. Ravindran , R. Vidya , A. Kjekshus , H. Fjellvåg , O. Eriksson

Using local-probe magnetic-characterization techniques of muon spin relaxation ($\mu$SR) and electron spin resonance (ESR) we have investigated the Mn-induced magnetism of the wide-bandgap perovskite SrTiO$_3$. Our results clearly…

Strongly Correlated Electrons · Physics 2014-03-25 Andrej Zorko , Matej Pregelj , Hubertus Luetkens , Anna-Karin Axelsson , Matjaz Valant

We report the observation of a magnetic polarization of the O\,$2p$-states in YMn$_2$O$_5$ through the use of soft X-ray resonant scattering at the oxygen $K$-edge. Remarkably, we find that the temperature dependence of the integrated…

Strongly Correlated Electrons · Physics 2015-03-19 S. Partzsch , S. B. Wilkins , J. P. Hill , E. Schierle , E. Weschke , D. Souptel , B. Büchner , J. Geck

Magnetometry, x-ray, and neutron scattering have been used to study the structural and magnetic properties of a TbMnO3 thin film grown on a [001] SrTiO3 substrate by pulsed laser deposition. Although bulk TbMnO3 is a low temperature…

Materials Science · Physics 2009-11-13 B. J. Kirby , D. Kan , A. Luykx , M. Murakami , D. Kundaliya , I. Takeuchi

The high temperature ferromagnetism in Sr3YCo4O10+delta perovskite, whose origin has been the subject of a considerable debate, has been studied by neutron powder diffraction and synchrotron X-ray diffraction measurements. Oxygen vacancy…

We have investigated the electronic states and spin polarization of half-metallic ferromagnet CrO$_2$ (100) epitaxial films by bulk-sensitive spin-resolved photoemission spectroscopy with a focus on non-quasiparticle (NQP) states derived…

Strongly Correlated Electrons · Physics 2017-11-07 Hirokazu Fujiwara , Masanori Sunagawa , Kensei Terashima , Tomoko Kittaka , Takanori Wakita , Yuji Muraoka , Takayoshi Yokoya

Magnetoresistance measurements on the magnetic semiconductor (In,Mn)Sb suggest that magnetic scattering in this material is dominated by isolated Mn$^{2+}$ ions located outside the ferromagnetically-ordered regions when the system is below…

Other Condensed Matter · Physics 2009-11-11 M. Csontos , T. Wojtowicz , X. Liu , M. Dobrowolska B. Jankó , J. K. Furdyna , G. Mihály

Neutron scattering studies and measurements of the dielectric susceptibility and ferroelectric polarization P have been carried out in various magnetic fields H for single-crystal samples of the multiferroic system LiVCuO4 with quasi…

Strongly Correlated Electrons · Physics 2015-05-13 Yukio Yasui , Yutaka Naito , Kenji Sato , Taketo Moyoshi , Masatoshi Sato* , Kazuhisa Kakurai

We present a new member of the multiferroic oxides, Lu$_2$MnCoO$_6$, which we have investigated using X-ray diffraction, neutron diffraction, specific heat, magnetization, electric polarization, and dielectric constant measurements. This…

We report on microscopic study of the ferromagnetism enhancement in the Ru doped ferromagnetic superconductor (FM SC) UCoGe. For that purpose, two single crystals with composition UCo0.97Ru0.03Ge and UCo0.88Ru0.12Ge were prepared. Both…

We present a thorough $^{77}$Se NMR study of a single crystal of the magnetoelectric compound Cu$_2$OSeO$_3$. The temperature dependence of the local electronic moments extracted from the NMR data is fully consistent with a magnetic phase…

Strongly Correlated Electrons · Physics 2010-09-17 M. Belesi , I. Rousochatzakis , H. C. Wu , H. Berger , I. V. Shvets , F. Mila , J. P. Ansermet

We report on the quantum criticality of Pr$_3$Ru$_4$Sn$_{13}$ revealed by our new material research. Pr$_3$Ru$_4$Sn$_{13}$ has been synthesized by flux growth and characterized by single X-ray, powder X-ray, and powder neutron diffraction…

With a combined ab initio density functional and model Hamiltonian approach we establish that in the recently discovered multiferroic phase of the manganite Sr$_{1/2}$Ba$_{1/2}$MnO$_{3}$ the polar distortion of Mn and O ions is stabilized…

Materials Science · Physics 2015-03-09 Gianluca Giovannetti , Sanjeev Kumar , Carmine Ortix , Massimo Capone , Jeroen van den Brink

The electron spin polarization on half-metallic double-perovskites is usually conditioned to the ordered rock-salt arrangement of the transition-metal ions along the lattice. In this work, we investigate a polycrystalline sample of the…

Ab initio calculations of the electric polarization of correlation-driven insulating materials, namely Mott insulators, have not been possible so far. Using a combination of density functional theory and dynamical-mean-field theory we study…

Materials Science · Physics 2014-12-11 R. Nourafkan , G. Kotliar , A. -M. S. Tremblay

Ferroelectric Ising chain magnet Ca$_3$Co$_{2-x}$Mn$_x$O$_6$ ($x\simeq$0.96) was studied in magnetic fields up to 33 T. Magnetization and neutron scattering measurements reveal successive metamagnetic transitions from the zero-field…

Strongly Correlated Electrons · Physics 2009-11-13 Y. J. Jo , Seongsu Lee , E. S. Choi , H. T. Yi , W. Ratcliff , Y. J. Choi , V. Kiryukhin , S. W. Cheong , L. Balicas

We report the observation of magnetic superstructure in a magnetization plateau state of SrCu2(BO3)2, a frustrated quasi-two-dimensional quantum spin system. The Cu and B nuclear magnetic resonance (NMR) spectra at 35 mllikelvin indicate an…

Strongly Correlated Electrons · Physics 2009-11-07 K. Kodama , M. Takigawa , M. Horvatic , C. Berthier , H. Kageyama , Y. Ueda , S. Miyahara , F. Becca , F. Mila

We present a study of the magnetic and crystallographic structure of TbMnO$_3$ in the presence of crossed electric and magnetic fields using circularly polarised X-ray non-resonant scattering. A comprehensive account is presented of the…

Strongly Correlated Electrons · Physics 2014-01-13 H. C. Walker , F. Fabrizi , L. Paolasini , F. de Bergevin , D. Prabhakaran , A. T. Boothroyd , D. F. McMorrow