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Volkov, N V,Eremin, E V,Tsikalov, V S,Patrin, G S,Kim, P D,Seong-Cho, Yu,Kim, Dong-Hyun,Chau, Nguyen Institute of Physics [etc.] 2009 Journal of Physics. D, Applied Physics Vol.42 No.6
<P>The transport and magnetotransport properties of a newly fabricated tunnel structure <I>manganite/depletion layer/manganese silicide</I> have been studied in the current-in-plane (CIP) geometry. A manganite depletion layer in the structure forms a potential barrier sandwiched between two conducting layers, one of manganite and the other of manganese silicide. The voltage–current characteristics of the structure are nonlinear due to switching conducting channels from an upper manganite film to a bottom, more conductive MnSi layer with an increase in the current applied to the structure. Bias current assists tunnelling of a carrier across the depletion layer; thus, a low-resistance contact between the current-carrying electrodes and the bottom layer is established. Below 30 K, both conducting layers are in the ferromagnetic state (magnetic tunnel junction), which allows control of the resistance of the tunnel junction and, consequently, switching of the conducting channels by the magnetic field. This provides a fundamentally new mechanism of magnetoresistance (MR) implementation in the magnetic layered structure with CIP geometry. MR of the structure under study depends on the bias current and can reach values greater than 400% in a magnetic field lower than 1 kOe. A positive MR value is related to peculiarities of the spin-polarized electronic structures of manganites and manganese silicides.</P>
Kamble, Bhaskar,Akbari, Alireza,Eremin, Ilya IOP Publishing - Europhysics Letters 2016 Europhysics letters Vol.114 No.1
<P>We employ a five-orbital tight-binding model to develop the mean-field solution for various possible spin density wave states in the iron-chalcogenides. The quasiparticle interference (QPI) technique is applied to detect signatures of these states due to scatterings arising from non-magnetic impurities. Apart from the experimentally observed double-striped structure with ordering vector (pi/2, pi/2), the QPI method is investigated for the extended-stripe as well as the orthogonal double-stripe phase. We discuss QPI as a possible tool to detect and classify various magnetic structures with different electronic structure reconstruction within the framework of the Fe1+yTe compound. Copyright (C) EPLA, 2016</P>
Self-energy effects and electron–phonon coupling in Fe–As superconductors
Choi, K-Y,Lemmens, P,Eremin, I,Zwicknagl, G,Berger, H,Sun, G L,Sun, D L,Lin, C T IOP Pub 2010 Journal of Physics, Condensed Matter Vol.22 No.11
<P>Doping and temperature dependent studies of optical phonon modes in Fe-122 pnictides are performed using Raman scattering experiments and compared with model calculations to elucidate the role of electron-phonon and spin-phonon interaction in this family of compounds. The frequency and linewidth of the B(1g) mode at around 210 cm(-1) is highlighted as appreciable anomalies at the superconducting and spin density wave transitions are observed that strongly depend on composition. We give estimates of the electron-phonon coupling related to this renormalization and calculate the phonon self-energy on the basis of a four-band model comparing different symmetries of the order parameters. In addition, we observe a pronounced quasi-elastic Raman response for the undoped compound, suggesting persisting magnetic fluctuations in the spin density wave state.</P>
( Won Bo Shim ),( Boris B. Dzantiev ),( Sergei A. Eremin ),( Duck Hwa Chung ) 한국미생물 · 생명공학회 2009 Journal of microbiology and biotechnology Vol.19 No.1
Individual immunochromatographic assays (ICG) for ochratoxin A (OTA) and zearalenone (ZEA) were optimized and used in the development of a one-step simultaneous immunochromatographic assay (OS-ICG) for the rapid multianalysis of two mycotoxins in corn samples. The nitrocellulose membrane of the OS-ICG was treated with OTA-bovine serum albumin (BSA), ZEA-ovalbumin (OVA), and anti-mouse IgG in the OTA test, ZEA test, and control zones, respectively. Monoclonal antibody-gold conjugates (OTA3 MAb-gold and ZEA2C5 MAb-gold) were sprayed onto the conjugate pad. The visual detection limits were 2.5 and 5 ng/ml for OTA and ZEA, resepectively, and the results were obtained within 15 min after starting the analysis. An efficient, simple, and rapid extraction method using 30% MeOH/PBS was established and validated by analyzing the corn samples spiked with OTA/ZEA mixtures (0/0, 5/10, 10/20, and 20/30 μg/kg). The cut-off values of the OS-ICG for the spiked corn were 5 and 10 μg/kg for OTA and ZEA, respectively. Natural corn samples were analyzed by OS-ICG, direct competitive enzyme-linked immunosorbent assay (DC-ELISA), and HPLC. Results of the OS-ICG were in good agreement with those obtained by DC-ELISA and HPLC. The developed OS-ICG offers a rapid, easy-to-use, and portable analytical system and can be used as a convenient qualitative tool for the on-site simultaneous determination of OTA and ZEA in cereals, food, and agricultural products in one analytical cycle.
Choi, Eun H.,Kim, Dong M.,Choi, Sung‐,Wook,Eremin, Sergei A.,Chun, Hyang S. Blackwell Publishing Ltd 2011 International journal of food science & technology Vol.46 No.10
<P><B>Summary</B></P><P>The purpose of this study was to develop a highly sensitive fluorescence polarisation immunoassay (FPIA) for the detection of zearalenone (ZEN). The method was optimised and validated to examine the feasibility of performing FPIA using several tracers synthesised from different fluorescence labels and chemicals structurally mimicking ZEN. Optimum extraction conditions were determined, and 4‐(aminomethyl) fluorescein‐labelled ZEN tracer (ZEN‐4AMF) was selected as the tracer. None of the tracers mimicking ZEN gave a favourable response with the monoclonal anti‐ZEN antibody. When tested on a corn matrix, the FPIA showed a detection limit of 77 μg kg<SUP>−1</SUP> within 3 min, excluding extraction time. Recovery of ZEN averaged 101% (intraday) and 109% (interday), and trueness averaged 111%. Ruggedness was satisfactory but cross‐reactivity with ZEN analogues was relatively high. These results suggest that the current FPIA for the detection of ZEN has a potential as an easy and rapid screening tool for ZEN and its analogues in corn.</P>
Optically driven conductivity and magnetoresistance in a manganite-based tunnel structure
Volkov, N V,Lee, C G,Kim, P D,Eremin, E V,Patrin, G S Institute of Physics [etc.] 2009 Journal of physics. D, applied physics Vol.42 No.20
<P>In the multilayer structure, La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB>/depleted manganite layer/MnSi, the photovoltaic effect has been discovered. The depleted manganite layer in the structure is dielectric and serves as a potential barrier between the ferromagnetic conducting La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB> and MnSi layers by the formation of a magnetic tunnel junction. The photoinduced changes in the transport properties of the magnetic tunnel structure have been observed in the current-in-plane geometry. The changes are reversible and saturate at radiation power densities over 30 mW cm<SUP>−2</SUP>. The photovoltaic effect has a threshold character: it reveals only at <I>h</I>ν > 1.17 eV. Most likely, the effect of optical radiation is related to the formation of electron–hole pairs due to interband absorption of light in the dielectric layer. A photocurrent through the tunnel junctions separating the conducting layers causes a redistribution of the current channels between the conducting layers, which influences the conductivity and the magnetoresistance of the structure.</P>
Sub-gap optical response in the Kitaev spin-liquid candidate <i>α</i>-RuCl<sub>3</sub>
Reschke, Stephan,Mayr, Franz,Widmann, Sebastian,von Nidda, Hans-Albrecht Krug,Tsurkan, Vladimir,Eremin, Mikhail V,Do, Seung-Hwan,Choi, Kwang-Yong,Wang, Zhe,Loidl, Alois IOP 2018 Journal of physics, an Institute of Physics journa Vol.30 No.47
<P>We report detailed optical experiments on the layered compound <I>α</I>-RuCl<SUB>3</SUB> focusing on the THz and sub-gap optical response across the structural phase transition from the monoclinic high-temperature to the rhombohedral low-temperature structure, where the stacking sequence of the molecular layers is changed. This type of phase transition is characteristic for a variety of tri-halides crystallizing in a layered honeycomb-type structure and so far is unique, as the low-temperature phase exhibits the higher symmetry. One motivation is to unravel the microscopic nature of THz and spin-orbital excitations via a study of temperature and symmetry-induced changes. The optical studies are complemented by thermal expansion experiments. We document a number of highly unusual findings: A characteristic two-step hysteresis of the structural phase transition, accompanied by a dramatic change of the reflectivity. A complex dielectric loss spectrum in the THz regime, which could indicate remnants of Kitaev physics. Orbital excitations, which cannot be explained based on recent models, and an electronic excitation, which appears in a narrow temperature range just across the structural phase transition. Despite significant symmetry changes across the monoclinic to rhombohedral phase transition and a change of the stacking sequence, phonon eigenfrequencies and the majority of spin-orbital excitations are not strongly influenced. Obviously, the symmetry of a single molecular layer determines the eigenfrequencies of most of these excitations. Only one mode at THz frequencies, which becomes suppressed in the high-temperature monoclinic phase and one phonon mode experience changes in symmetry and stacking. Finally, from this combined terahertz, far- and mid-infrared study we try to shed some light on the so far unsolved low energy (<1 eV) electronic structure of the ruthenium 4<I>d</I> <SUP>5</SUP> electrons in <I>α</I>-RuCl<SUB>3</SUB>.</P>