Temat: 75.30.Fv - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: On Effect of Spin-Density Wave Parameters on Shape of $\text{}^{119}$Sn Mössbauer Spectra
Autorzy:: Cieślak, J.
Dubiel, S. M.
Tematy:: 76.80.+y
75.30.Fv
75.50.Ee; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1943948.pdf Link otwiera się w nowym oknie
Opis:: Based on a simple numerical procedure the influence of various parameters characteristic of spin-density waves on the shape of $\text{}^{119}$Sn Mössbauer spectra and the related histograms of the Hyperfine field distributions is investigated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Interplay Between Spin Density Wave and Superconductivity in `122 Iron Pnictides: $\text{}^{57}Fe$ Mössbauer Study
Autorzy:: Błachowski, A.
Ruebenbauer, K.
Żukrowski, J.
Bukowski, Z.
Matusiak, M.
Karpinski, J.
Tematy:: 74.70.Xa
75.30.Fv
76.80.+y; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1431157.pdf Link otwiera się w nowym oknie
Opis:: Iron-based superconductors $Ba_{0.7}Rb_{0.3}Fe_{2}As_{2}$ and $CaFe_{1.92}Co_{0.08}As_{2}$ of the `122' family have been investigated by means of the 14.41-keV Mössbauer transition in $\text{}^{57}Fe$ versus temperature ranging from the room temperature till 4.2 K. A comparison is made with the previously investigated parent compounds $BaFe_{2}As_{2}$ and $CaFe_{2}As_{2}$. It has been found that Mössbauer spectra of these superconductors are composed of the magnetically split component due to development of spin density wave and non-magnetic component surviving even at lowest temperatures. The latter component is responsible for superconductivity. Hence, the superconductivity occurs in the part of the sample despite the sample is single phase. This phenomenon is caused by the slight variation of the dopant concentration across the sample (crystal).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: On a Field-Induced Spin-Density Wave in Bechgaard Salts
Autorzy:: Apostol, M.
Tematy:: 75.30.Fv
75.50.Rr
71.45.Lr; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1931366.pdf Link otwiera się w nowym oknie
Opis:: A new type of field-induced spin-density wave is shown to occur in a weak-coupling layered model which may be relevant for the highly anisotropic electronic structure of the Bechgaard salts. The modulation vector of this instability is perpendicular to the layers and close to the direction of the magnetic field applied perpendicular to the reciprocal layers. The magnitude of the modulation vector, order parameter and critical temperature have an oscillatory dependence on the magnitude of the magnetic field.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Influence of Quadrupole Interaction on $\text{}^{57}$Fe Mössbauer Spectra for Samples with Charge- and Spin-Density Waves
Autorzy:: Cieślak, J.
Dubiel, S. M.
Tematy:: 76.80.+y
75.30.Fv
75.50.Ee; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1964225.pdf Link otwiera się w nowym oknie
Opis:: The influence of the quadrupole interaction on the shape of $\text{}^{57}$Fe Mössbauer spectra expected for samples with charge-density waves andor spindensity waves is investigated. It is shown, by model calculations, that both for the commensurate and for incommensurate charge-density waves andor spin-density waves the shape of $\text{}^{57}$Fe Mössbauer spectra is sensitive to the value, and for asymmetric spectra, to the sign of quadrupole interaction. This necessitates an inclusion of quadrupole interaction when analyzing the spectra recorded on samples exhibiting charge-density waves andor spin-density waves, and having a symmetry lower than cubic.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Application of the $\text{}^{119}$Sn Mössbauer-Effect Spectroscopy in the Investigation of Spin-Density-Waves in Chromium
Autorzy:: Dubiel, S. M.
Tematy:: 75.30.Fv
75.50.Ee
76.80.+y
75.25.+z; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1929384.pdf Link otwiera się w nowym oknie
Opis:: Application of $\text{}^{119}$Sn Mossbauer-effect spectroscopy in an investigation of spin-density-waves in chromium in terms of model calculations as well as of measurements on real samples is presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Structure and Short Range Order of Two Phases in the Single Domain $Mn_{0.75}Cu_{0.25}$ Alloy after Spinodal Decomposition
Autorzy:: Jankowska-Kisielińska, J.
Świderska, K.
Mikke, K.
Tematy:: 61.05.F-
75.30.Fv
75.40.-s
75.50.Lk; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1538297.pdf Link otwiera się w nowym oknie
Opis:: The aim of the present paper was to identify the atomic and magnetic structure and short-range order of the two phases present in the $Mn_{0.75}Cu_{0.25}$ alloy after decomposition and plastic deformation. The sample was investigated by elastic neutron scattering at small-angle and 3-axes spectrometers. We have confirmed the decomposition of the alloy into two types of regions with manganese concentration increased and decreased as compared with the mean value. The crystal lattice in regions of both types is tetragonal (pseudo FCT) below $T_{N}$ but degree of tetragonal distortion is different. The long range antiferromagnetic order is present only in the regions of bigger distortion and higher Mn concentration. In the regions of lower Mn content and smaller distortion there is a short range ordering of complex magnetic and atomic character.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Diffuse Neutron Scattering in the $Mn_{0.4}Cu_{0.6}$ Alloy
Autorzy:: Jankowska-Kisielińska, J.
Mikke, K.
Fijał-Kirejczyk, I.
Tematy:: 61.05.F-
75.30.Fv
75.40.-s
75.50.Lk; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813173.pdf Link otwiera się w nowym oknie
Opis:: The diffuse neutron scattering in the $Mn_{0.4}Cu_{0.6}$ alloy was measured in the temperature range 15-390K at the 3-axis neutron spectrometer at MARIA reactor in Świerk. The broad maxima of the neutron intensity were observed in the surrounding of the (0.5, 1, 0) reciprocal lattice point and other symmetry related points. The effect is similar to that observed in Mn-Cu alloys with lower Mn content at room temperature. Our results are in agreement with the earlier finding that the maxima of the short-range order incommensurate spin density wave scattering are placed at the (0.5±δ, 1, 0) reciprocal lattice point with a linear dependence of δ on the Mn concentration. In addition, some commensurate antiferromagnetic short-range order was found.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Superconductivity and Quantum Critical Behavior in Cr_{100-z}Os_z
Autorzy:: Prinsloo, A.
Sheppard, C.
Fernando, P.
Tematy:: 75.50.Ee
75.30.Fv
74.70.Ad
74.40.Kb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1398328.pdf Link otwiera się w nowym oknie
Opis:: The magnetic phase diagrams of Cr alloys with group-8 metals, such as Re and Ru, show interesting properties. These include quantum critical and superconducting behavior. In order to extend these investigations this paper reports on the physical properties and the magnetic phase diagram of the $Cr_{100-z}Os_{z}$ system, investigated in a concentration range of 2 ≤ z ≤ 30.6. Structural analysis indicate that samples with z<22 have a bcc structure, while those with z>22 include a cubic A15-type structure. Transport and magnetic property measurements indicate that the antiferromagnetic phase disappears at z ≈ 14 and that samples with concentrations z ≥ 12.2 show superconducting behavior. The magnetic phase diagram of $Cr_{100-z}Os_{z}$ is constructed from the Néel and superconducting transition temperatures obtained from various measurements. The commensurate spin-density-wave to paramagnetic phase line decreases sharply for z>4. Fitting parameters of a power law fit to the commensurate spin-density-wave to paramagnetic phase line indicate possible quantum critical behavior. Present results suggest that this phase line terminates in a superconducting dome near a magnetic quantum critical point, similar to that observed in certain heavy fermion systems, but not previously reported for other Cr alloys.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Kondo Screening Effect and Ferromagnetic Order in $UCu_2Si_2$
Autorzy:: Troć, R.
Samsel-Czekała, M.
Coqblin, B.
Tematy:: 73.43.Qt
75.30.Mb
75.30.Fv
71.18.+y; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1426710.pdf Link otwiera się w nowym oknie
Opis:: Electrical resistivity and low temperature magnetoresistivity measurements made on a single crystal of $UCu_2Si_2$ are reported. By using as a phonon reference the temperature dependence of the electrical resistivity of $ThCu_2Si_2$ we could establish that $UCu_2Si_2$ has both a ferromagnetic and a Kondo behaviour. Such a phenomenon can be described by the underscreened Kondo lattice model. The magnetoresistivity revealed the presence of magnetic fluctuations within the ferromagnetic order as it was reported previously for $UGe_2$. Also one of the calculated Fermi surface sheets exhibits nesting properties, being in perfect agreement with the previous neutron diffraction data, supporting the possibility of a presence of the spin density wave phase. In this ternary silicide, where the strong ferromagnetic behaviour exists, this phase is signalised by magnetic fluctuations.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Magnetic Topological Structures in Multiferroics
Autorzy:: Gareeva, Z.
Zvezdin, K.
Popkov, A.
Zvezdin, A.
Tematy:: 75.85.+t
75.50.Ee
75.30.Fv
75.50.Gg
75.60.Ch; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1030690.pdf Link otwiera się w nowym oknie
Opis:: In this article we focus on impact of micromagnetic structures on magnetoelectricity of multiferroics. We discuss physical mechanisms of magnetoelectric coupling considering domain walls and spin cycloids. We review the progress on multiferroic materials focusing on high temperature multiferroic: rare earth iron garnet and bismuth ferrite. We argue that topological structures play a pivotal role in multiferoics and show that electric control of magnetism can be carried out via spin spirals and domain walls. Magnetic domain walls produce ferroelectricity in rare earth iron garnets; transformations of spin cycloids release magnetoelectricity in bismuth ferrite. Ferroic orders couple via magnetic inhomogeneities, which shed new light on fundamental physics and applications.
Dostawca treści:: Biblioteka Nauki

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