Temat: 75.47.Lx - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Barrier and Self-Energy Effects in Manganite Tunneling Characteristics
Autorzy:: Svistunov, V.
Revenko, Y.
Belogolovskii, M.
Gerasimenko, A.
Pashkevich, Y.
Szymczak, H.
Przyslupski, P.
Komissarov, I.
Tematy:: 75.47.Gk
75.47.Lx; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2037099.pdf Link otwiera się w nowym oknie
Opis:: Tunneling conductance spectra of point-contact junctions formed by a sharp Ag tip and two optimally doped manganites La$\text{}_{0.67}$Sr$\text{}_{0.33}$MnO$\text{}_{3}$ and Nd$\text{}_{0.67}$ Sr$\text{}_{0.33}$MnO$\text{}_{3}$ are measured and analyzed. It was found that the analytical dependence of the differential conductance on voltage strongly depends on the bias sign and dramatically changes after voltage treatments. The data obtained are explained in terms of the Glasman-Matveev model for tunneling across two localized states settled in the barrier near the manganite bulk. Effective functions of electron-boson interaction extracted from self-energy contributions to the experimental characteristics contain signs of phonon and magnon excitations, higher-energy satellites as a result of possible orbital ordering and a hallmark of localized states in the near-barrier region in the form of strong not-well reproduced peaks.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Elastic Properties of Double-Layered Manganite $La_{1.2}Sr_{1.8-x}Ba_xMn_2O_7$ (x=0.0-0.4)
Autorzy:: Reddy, Y.
Prashanth Kumar, V.
Ramesh, S.
Venkanna, S.
Ramana Reddy, M.
Kistaiah, P.
Vishnuvardhan Reddy, C.
Tematy:: 75.47.Gk
75.47.Lx; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1812358.pdf Link otwiera się w nowym oknie
Opis:: The elastic behavior of the sol-gel prepared double-layered manganite system $La_{1.2}Sr_{1.8-x}Ba_xMn_2O_7$ (x = 0.0-0.4) was investigated at 300 K, employing ultrasonic pulse transmission technique at 1 MHz. The values of elastic moduli and acoustic Debye temperature $(θ_D)$ were computed from longitudinal and shear velocities. The measured values were corrected to zero porosity using Hasselman and Fulrath's formula. The elastic constants of the samples, estimated using Modi's heterogeneous metal-mixture rule, were also reported. The variation of elastic moduli with Ba concentration was interpreted in terms of strength of interatomic bonding.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Structural Investigations and Magnetic Properties of $BaFe_{12}O_{19}$ Crystals
Autorzy:: Tudorache, F.
Popa, P.
Brinza, F.
Tascu, S.
Tematy:: 75.75.Cd
75.47.Lx; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1490860.pdf Link otwiera się w nowym oknie
Opis:: This work was dedicated to the preparation of a barium hexaferrite using the glass crystallization method. The glass flakes were treated at temperatures ranging between 550C and 750°C. The investigation carried out by X-ray diffraction revealed the phase composition and the mean crystallite size. By means of the scanning electron microscopy, the crystallite shape and average size were established. The electric and magnetic properties were investigated at room temperature by means of a Solartron 1260A impedance/gain phase analyzer and a vibrating sample magnetometer. The optimum heat treatment was established to obtain the maximum coercivity of the barium hexaferrite.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Magnetization Study of the AFM-FM Coexistence in the Manganite System $Pr_{0.5}Ca_{0.5-x}Sr_xMnO_3$
Autorzy:: Maryško, M.
Jirák, Z.
Tematy:: 75.60.-d
75.47.Lx; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813589.pdf Link otwiera się w nowym oknie
Opis:: For the manganites $Pr_{0.5}Ca_{0.5-x}Sr_xMnO_3$ (x=0;0.3) the temperature and cooling field dependence of the reduced remanence asymmetry indicates the antiferromagnetic exchange between the antiferromagnetic and ferromagnetic spins at the surface of the clusters. For x=0.3 we deduce the radius of the cluster in the field cooled regime to be about 20 times larger than that for x=0.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Effects of Doping on the Structural Distortion of $La_{0.7}Dy_{0.3}Mn_{1-x}Zn_xO_3$
Autorzy:: López, J.
Ríos, M.
Mendoza, G.
Tematy:: 75.47.Lx
61.50.-f; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1398317.pdf Link otwiera się w nowym oknie
Opis:: Structural properties were studied in the orthorhombic perovskite $La_{0.7}Dy_{0.3}Mn_{1-x}Zn_{x}O_3$, synthesized in the range 0 ≤ x ≤ 0.4. X-ray diffraction data, refined by the Rietveld analysis, shows for x < 0.1 the presence of stretched octahedra on the Mn-O plane, and, for x > 0.1, the existence of elongated octahedra along the c axis. Increased Zn doping causes a direct structural effect: one Zn atom distorts four neighboring MnO₆ octahedra on the Mn-O plane. It was observed that the unit cell volume containing Dy decreases as x increases, whereas the unit cell volume containing La increases as x decreases.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Growth and Investigation of Oxide Heterostructures Based on Half-Metallic Fe$\text{}_{3}$O$\text{}_{4}$
Autorzy:: Vengalis, B.
Šliužienė, K.
Lisauskas, V.
Tematy:: 75.47.Gk
75.47.Lx
07.57.Kp; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2038160.pdf Link otwiera się w nowym oknie
Opis:: We report thin films of ferromagnetic Fe$\text{}_{3}$O$\text{}_{4}$ (magnetite) grown by a reactive magnetron sputtering at T=300÷450°C on lattice-matched MgO, and bilayer structures composed of Fe$\text{}_{3}$O$\text{}_{4}$ and underlying epitaxial films of highly conductive electron-doped In$\text{}_{2}$O$\text{}_{3}$〈Sn〉, LaNiO$\text{}_{3}$, and antiferromagnetic CoO. The prepared Fe3O4/MgO films and the bilayer structures demonstrated clearly defined resistance anomaly at Verwey transition point (T$\text{}_{V}$≈100-120 K). Formation of high resistance interlayer was indicated between the adjacent conducting Fe3O4 and LaNiO3 layers. However, relatively low interface resistivity of about 0.1 Ω cm$\text{}^{2}$ (at T=300 K) was estimated for the patterned Fe3O4/In2O3〈Sn〉 bilayer structures. Vertical electrical transport measurements revealed strong nonlinearity in the I-U dependences of the Fe3O4/In2O3 〈Sn〉 interface at T
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Frequency Dependence of Electrical Response of Polycrystalline LCMO Thin Films
Autorzy:: Ašmontas, S.
Anisimovas, F.
Balevičius, S.
Cimmperman, P.
Gradauskas, J.
Lučun, A.
Stankevič, V.
Sužiedėlis, A.
Vengalis, B.
Žurauskienė, N.
Tematy:: 75.47.Gk
75.47.Lx
07.57.Kp; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2041721.pdf Link otwiera się w nowym oknie
Opis:: Influence of strong electric field in wide frequency range (from DC to 35 GHz) on electrical resistance of thin La$\text{}_{0.67}$Ca$\text{}_{0.33}$MnO$\text{}_{3}$ polycrystalline manganite films was investigated in the range of (78÷300) K. Different behavior of resistance change vs. temperature was observed when pulsed DC electric field and microwaves were applied to the films. When pulsed DC electric field is applied the electric-field-induced resistance change ("electroresistance") of manganite film depended nearly monotonically on temperature. However, in microwave electric fields a non-monotonic character of the electroresistance temperature dependence was observed. The dependence of the electroresistance on quality of manganite films was observed in case of microwaves. The experimental findings are explained assuming different electrical current mechanisms in case of DC and microwave fields. The applied voltage drops mainly across the grains of polycrystalline film due to a presence of displacement currents in case of microwaves, whereas in DC case the voltage drop is across the grain boundaries.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Novel Properties of Atomically Arranged Perovskites
Autorzy:: Dabrowski, B.
Kolesnik, S.
Chmaissem, O.
Suescun, L.
Mais, J.
Tematy:: 75.47.Lx
75.47.Gk
61.12.Ld; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2047207.pdf Link otwiera się w nowym oknie
Opis:: Perovskites AMO$\text{}_{3-δ}$ attain unique electronic, magnetic, ferroelectric, thermoelectric, mixed-conducting, and other functional properties through selection of the A- and M-site ions, their fractions, ionic sizes and valences, spin states, and orbital orderings, as well as the oxygen content and vacancy ordering. We illustrate here our systematic exploration of the effects of composition, temperature, pressure, and oxygen content on the thermodynamic stability and magnetic properties for La$\text{}_{1-x-y}$Sr$\text{}_{x}$Ba$\text{}_{y}$MnO$\text{}_{3}$ manganites. Parameters controlling magnetic transitions are identified through examples of single-valent compounds of RMnO$\text{}_{3}$ (the Mn-O-Mn bond angles that can be equivalently described in terms of the tolerance factor) and Sr$\text{}_{1-x}$Ca$\text{}_{x}$MnO$\text{}_{3}$ (the tolerance factor and disorder described in terms of the variance of A-site ion sizes), and the mixed-valent La$\text{}_{0.5}$Sr$\text{}_{0.5-y}$Ba$\text{}_{y}$MnO$\text{}_{3}$ (the tolerance factor, variance of sizes, and the local strains described in terms of the elongated Mn-O bonds). By using an example of kinetically stable, atomically-ordered layered-perovskites we show that improved useful properties, such as the increase in the Curie temperature T$\text{}_{C}$ and enhancement of colossal magneto-resistive effect at room temperature, can be achieved through decreases in structural distortions such as variance of sizes and local strains.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Reversible Resistive Switching in Electrically Nonhomogeneous $La_{0.67}Ca_{0.33}MnO_3$ Thin Films by Short Electrical Pulses
Autorzy:: Lučun, A.
Kiprijanovič, O.
Ašmontas, S.
Anisimovas, F.
Maneikis, A.
Sužied.lis, A.
Vengalis, B.
Tematy:: 75.47.Gk
75.47.Lx
07.57.Kp; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813407.pdf Link otwiera się w nowym oknie
Opis:: Resistance changes in thin electrically nonhomogeneous $La_{0.67}Ca_{0.33}MnO_3$ films were investigated using electrical pulses of nanosecond duration in the 80-300 K temperature range. Two types of reversible switching to higher resistive states with different starting temperature induced by series of the positive pulses were observed. Possible mechanisms of the resistance switching by short electrical pulses in the vicinity of $T_m$ and at 80-90 K are discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Laser Induced Self-Organization of Nanohills/Nanowires in $SiO_2$/Si Interface
Autorzy:: Medvid, A.
Onufrijevs, P.
Dmitruk, I.
Pundyk, I.
Tematy:: 75.47.Gk
75.47.Lx
07.57.Kp; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813410.pdf Link otwiera się w nowym oknie
Opis:: The aim of this work is to study optical properties of self-organized Si nanohills formed on the $SiO_2$/Si interface after pulsed Nd:YAG laser irradiation. Nanohills on Si surface give strong photoluminescence in the visible range of spectrum, with a long wing in red portion. This property is explained by charge carrier quantum confinement in nanohills/nanowires.
Dostawca treści:: Biblioteka Nauki

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