Critical behavior study of NdScSi, NdScGe intermetallic compounds

Oleaga, A.; Liubachko, V.; Manfrinetti, P.; Provino, A.; Vysochanskiǐ, Yu. M.; Salazar, A.

doi:10.1016/j.jallcom.2017.06.289

Cited by 12 publications

(14 citation statements)

References 30 publications

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“…Fig. 1 presents the thermal diffusivity (D) of Tb 3 Co as a function of temperature showing the common behavior in intermetallic materials where heat is transferred both by electrons and phonons [34,39,40]. From room temperature down, the electronic contribution is severely reduced due to the reduction of the resistivity while the increase in phonon contribution as the phonon mean free path increases is not enough to compensate.…”

Section: Resultsmentioning

confidence: 99%

“…Thermal diffusivity has been obtained as a function of temperature from room temperature down to 30 K, paying special attention to the region around the magnetic transitions. This technique is very well suited to study the critical behavior in phase transitions and has been successfully applied to solid and liquid crystals (magnetic as well as ferroelectric transitions), including other intermetallic materials [19,[27][28][29][30][31][32][33][34][35], as it combines very low temperature rates (down to 5-10 mK/min) with a high sensitivity. The details of the experimental setup, as well as of the theory explaining how to extract the thermal diffusivity from the photopyroelectric signal, can be found elsewhere [29,36].…”

Section: Samples and Experimental Techniquesmentioning

confidence: 99%

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Comprehensive study of the magnetic phase transitions in Tb3Co combining thermal, magnetic and neutron diffraction measurements

et al. 2019

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A comprehensive study of the magnetic phase transitions in Tb 3 Co has been undertaken combining different techniques. Using single crystal neutron diffraction in the paramagnetic state a weak crystal structure distortion from the room temperature orthorhombic structure of the Fe 3 C type described with the Pnma space group toward structure with lower symmetry has been observed with cooling below 100 K. At 81 K there is a second order phase transition to an antiferromagnetic incommensurate phase with the propagation vector k = (0.155, 0, 0). As derived from thermal diffusivity measurements, the critical exponents for this transition are very close to the 3D-Heisenberg universality class, proving that the magnetic interactions are short-range but with a deviation from perfect isotropy due to crystal field effects. At T 2  70 K there is another magnetic phase transition to a ferromagnetic state whose character is shown to be weakly first order. The low temperature magnetic state has a non-coplanar ferromagnetic structure with strong ferromagnetic components of Tb magnetic moments along the crystallographic c-axis. The application of an external magnetic field B = 2 T along the

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Section: Resultsmentioning

confidence: 99%

Section: Samples and Experimental Techniquesmentioning

confidence: 99%

Comprehensive study of the magnetic phase transitions in Tb3Co combining thermal, magnetic and neutron diffraction measurements

et al. 2019

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“…There are also many examples of compounds that crystallize in the related CeScSi structure type, an ordered variant of the La 2 Sb-type (figure 1), such as RScSi or RScGe [15][16][17][18], RMgSn [19][20][21], RMgPb [22,23] and RZrSb [24]. The CeFeSi and CeScSi-type structures are closely related (see [25] for instance) and both exhibit a layer of empty [R 4 ] tetrahedra.…”

Section: Introductionmentioning

confidence: 99%

Study of the structural transition and hydrogenation of CeTiGe

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Pöttgen

et al. 2019

Journal of Alloys and Compounds

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There remains some disagreement in the literature on CeTiGe over the presence of a structural transition from the low temperature CeFeSi-type form to the high temperature CeScSi-type structure. We present a detailed study of the effect of temperature on this structural transition. Furthermore, the same hydride is obtained after hydrogenation of both forms. Using neutron powder diffraction we find that the structure of CeTiGeH 1.5 corresponds to a stuffed variant of the CeScSi-type structure with space group I4/mmm, a = 4.0785(1) Å and c = 17.1060(8) Å. The H atoms occupy both the Ce 4 tetrahedral sites and the CeTi 4 square based pyramidal sites for a total hydrogen occupancy of 1.5 H f.u.-1. Preliminary examinations of the magnetic properties after hydrogenation reveal the onset of low temperature magnetic order around 3.5 K, suggesting for the first time a hydrogen induced magnetic order for an intermetallic with CeScSi-type structure.

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“…Most of these properties are related to the coupling of the R-4f electronic states (localized) and other electronic states (itinerant) in the electronic system. In a magnetic transition induced by field, these features are observed accompanied by changes in volume or symmetry of crystal lattice [18,21]. Recently, many new RTX ternary intermetallics have been synthesized and actively investigated for different d metals as T [22][23][24][25][26][27], as well as usual 3d metals in the second position T in RTX [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…Ternary intermetallic compounds of the RTX series with R = rare-earth metal, T = d metal, X = p element, were studied intensively during the last years, see recent reviews [ 1 , 2 , 3 , 4 ]. A number of interesting magnetic and electric properties of practical and fundamental importance were found in different compounds of the RTX series, including magnetocaloric effect (MCE) [ 5 ] of giant [ 6 , 7 , 8 , 9 , 10 ] and large [ 11 , 12 , 13 ] magnitude and magnetoresistance, an antiferromagnetic to ferromagnetic order transition [ 14 , 15 ] and rich magnetic transition phase diagram [ 16 , 17 , 18 ]. Very recently, another promising application of some RXT was revealed as intermetallic electrides [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Electronic Correlations on the Electronic Structure, Magnetic and Optical Properties of the Ternary RCuGe Compounds with R = Tb, Dy, Ho, Er

et al. 2020

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In this study, the ab initio and experimental results for RCuGe ternary intermetallics were reported for R = Tb, Dy, Ho, Er. Our theoretical calculations of the electronic structure, employing local spin density approximation accounting for electron–electron correlations in the 4f shell of Tb, Dy, Ho, Er ions were carried in DFT+U method. The optical properties of the RCuGe ternary compounds were studied at a broad range of wavelengths. The spectral and electronic characteristics were obtained. The theoretical electron densities of states were taken to interpret the experimental energy dependencies of the experimental optical conductivity in the interband light–absorption region. From the band calculations, the 4f shell of the rare-earth ions was shown to provide the major contribution to the electronic structure, magnetic and optical properties of the RCuGe intermetallics. The accounting for electron–electron correlations in Tb, Dy, Ho, Er resulted in a good agreement between the calculated and experimental magnetic and optical characteristics.

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Critical behavior study of NdScSi, NdScGe intermetallic compounds

Cited by 12 publications

References 30 publications

Comprehensive study of the magnetic phase transitions in Tb3Co combining thermal, magnetic and neutron diffraction measurements

Comprehensive study of the magnetic phase transitions in Tb3Co combining thermal, magnetic and neutron diffraction measurements

Study of the structural transition and hydrogenation of CeTiGe

Effect of Electronic Correlations on the Electronic Structure, Magnetic and Optical Properties of the Ternary RCuGe Compounds with R = Tb, Dy, Ho, Er

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