Characterization of magnetocaloric effect, magnetic ordering and electronic structure in the GdFe1−xCoxSi intermetallic compounds

Włodarczyk, P.; Hawełek, ᴌ.; Zackiewicz, P.; Roy, Tufan; Chrobak, A.; Kamińska, Małgorzata; Kolano-Burian, Aleksandra; Szade, J.

doi:10.1016/j.matchemphys.2015.05.067

Cited by 21 publications

(15 citation statements)

References 20 publications

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“…A simple double-exchange argument indi-cates that the nearest neighbor interlayer magnetic interaction will change sign because Co and Fe differ by a single electron in the d shell. This change in the sign of the interactions is consistent with the magnetic behavior of GdCo 1−x Fe x Si [14][15][16] and CeTi 1−x Sc x Ge compounds [17].…”

supporting

confidence: 80%

Strong magnetoelastic effect in CeCo1−xFexSi as Néel order is suppressed

et al. 2019

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A very strong magnetoelastic effect in the CeCo1−xFexSi alloys is reported. The strength of the magnetostrictive effect can be tuned upon changing x. The moderate low-temperature linear magnetostriction observed at low Fe concentrations becomes very large ( ∆L L (16T, 2K) = 3×10 −3 ) around the critical concentration (xc ≈ 0.23) at which the long-range antiferromagnetic order vanishes. Upon increasing doping through the non-magnetic region (x > xc), the magnetostriction strength gradually weakens again. Remarkably the low-temperature magnetostriction at the critical concentration shows a pronounced S-like shape (centered at Bm ∼ 6 T) resembling other well-known Ce-based metamagnetic systems like CeRu2Si2 and CeTiGe. Unlike what is observed in these compounds, however, the field dependence of the magnetization shows only a minor upturn around Bm vaguely resembling a metamagnetic behavior. The subtle interplay between magnetic order and the Kondo screening seems to originate an enhanced valence susceptibility slightly changing the Ce ions valence, ultimately triggering the large magnetostriction observed around the critical concentration.

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supporting

confidence: 80%

Strong magnetoelastic effect in CeCo1−xFexSi as Néel order is suppressed

et al. 2019

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“…При этом магнитные моменты обеих систем определяются атомами Gd, поскольку атомы Fe, вследствие полного заполнения 3d-зоны, не обладают магнитным моментом. Необходимо особо отметить такие свойства, как аномально большие значения магнетокалорических эффектов вблизи точек магнитного упорядочения [10][11][12][13][14][15] и высокую способность к абсорбции атомарного водорода [16][17][18], позволяющие рассматривать эти сплавы в качестве функциональных материалов. Соединение GdFeAl в зависимости от условий приготовления может кристаллизоваться в кубической структуре типа MgCu 2 или в гексагональной MgZn 2 структуре.…”

Section: Introductionunclassified

“…Интерметаллид GdFeSi, в свою очередь, упорядочивается в тетрагональной структуре типа CeFeSi. Сплавление данных соединений с другими металлами, а также внешние воздействия приводят к заметным изменениям кристаллических параметров и магнитных характеристик [5,14,[16][17][18][19][20]. Например, замещение Fe атомами Mn в GdFeSi влечет за собой увеличение размеров решетки, рост результирующего магнитного момента и значительное повышение T C [7,19].…”

Section: Introductionunclassified

Электронная структура и оптические спектры соединений GdFeAl и GdFeSi

Князев¹,

Лукоянов²,

Кузьмин³

et al. 2021

Физика Твердого Тела

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Results of investigations of electronic structure and optical properties of GdFeAl and GdFeSi compounds are presented. Spin-plarized density of states and interband optical conductivity spectra were calculated in frame of DFT+U technique with a correction for strong correlation effects in 4f shell of Gd. Optical properties were measured by ellipsometric technique in wavelength interval of 0.22 – 16 μm. Nature of quantum light absorption is discussed on the base of comparative analysis of experimental and calculated spectra. It is shown that main features of frequency dependencies of the optical conductivity are interpret qualitatively by the calculated density of electronic states.

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“…In this case, the magnetic moments of both systems are determined by the Gd atoms, since the Fe atoms, due to the complete filling of the 3d zone, do not have a magnetic moment. It is necessary to emphasize that such properties as the abnormally large values of magnetocaloric effects near the points of magnetic ordering [10][11][12][13][14][15] and the high ability to absorb atomic hydrogen [16][17][18] allow considering these alloys as functional materials. Depending on the preparation conditions, the GdFeAl compound can crystallize in a cubic structure of the MgCu 2 type or in a hexagonal MgZn 2 structure.…”

Section: Introductionmentioning

confidence: 99%

“…In turn, the intermetallide GdFeSi is ordered in a tetragonal structure of the CeFeSi type. Alloying these compounds with other metals, as well as external influences, lead to noticeable changes in the crystal parameters and magnetic characteristics [5,14,[16][17][18][19][20]. For example, the substitution of Fe atoms in GdFeSi by Mn atoms brings about an increase in the lattice size, an increase in the resulting magnetic moment, and a significant increase in T C [7,19].…”

Section: Introductionmentioning

confidence: 99%

Electronic Structure and Optical Spectra of GdFeAl and GdFeSi Compounds

et al. 2021

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The results of studies of the electronic structure and optical properties of intermetallic compounds GdFeAl and GdFeSi are presented. The spin-polarized densities of electronic states and interband optical conductivity spectra are calculated using the DFT+U method, taking into account the influence of strong electronic interactions in the 4f-shell of Gd. The optical properties of these materials are studied by ellipsometry in the wavelength range 0.22-16 μm. The nature of light absorption is discussed on the basis of a comparative analysis of experimental and theoretical spectra. It is shown that the calculated densities of electronic states makes it possible to interpret qualitatively the main features of the frequency dependences of optical conductivity.

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Characterization of magnetocaloric effect, magnetic ordering and electronic structure in the GdFe1−xCoxSi intermetallic compounds

Cited by 21 publications

References 20 publications

Strong magnetoelastic effect in CeCo1−xFexSi as Néel order is suppressed

Strong magnetoelastic effect in CeCo1−xFexSi as Néel order is suppressed

Электронная структура и оптические спектры соединений GdFeAl и GdFeSi

Electronic Structure and Optical Spectra of GdFeAl and GdFeSi Compounds

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