Synthesis and Magnetic Properties of Ni3AlCx

Chen, Bin; Michioka, Chishiro; Itoh, Yutaka; Yoshimura, Kazuyoshi

doi:10.1143/jpsj.77.103708

Cited by 13 publications

(7 citation statements)

References 13 publications

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“…The Wilson ratio R W is about 2.4 and the dimensionless ratio that connects the low-temperature Seebeck coefficient with the Sommerfeld specific heat constant indicate that AlCNi 3 can be considered as a modest electron-correlated material. Consistently, the enhanced spin fluctuations were confirmed using 27 Al NMR measurement in AC x Ni 3 with x ≥ 0.1 where the FM order was suppressed and the system is in the vicinity of FM order [33,34]. On the contrary, an early experimental report shows AlCNi 3 is a weak ferromagnet with the FM-PM transition at 300 K [35].…”

Section: Research Progress On Ni-based Antiperovskite Compounds Othersupporting

confidence: 61%

Research Progress on Ni-Based Antiperovskite Compounds

Tong

Sun

2012

Advances in Condensed Matter Physics

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The superconductivity in antiperovskite compound MgCNi3was discovered in 2001 following the discovery of the superconducting MgB2. In spite of its lower superconducting transition temperature (8 K) than MgB2(39 K), MgCNi3has attracted considerable attention due to its high content of magnetic element Ni and the cubic structure analogous to the perovskite cuprates. After years of extensive investigations both theoretically and experimentally, however, it is still not clear whether the mechanism for superconductivity is conventional or not. The central issue is if and how the ferromagnetic spin fluctuations contribute to the cooper paring. Recently, the experimental results on the single crystals firstly reported in 2007 trend to indicate a conventionals-wave mechanism. Meanwhile many compounds neighboring to MgCNi3were synthesized and the physical properties were investigated, which enriches the physics of the Ni-based antiperovskite compounds and help understand the superconductivity in MgCNi3. In this paper, we summarize the research progress in these two aspects. Moreover, a universal phase diagram of these compounds is presented, which suggests a phonon-mediated mechanism for the superconductivity, as well as a clue for searching new superconductors with the antiperovskite structure. Finally, a few possible scopes for future research are proposed.

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Section: Research Progress On Ni-based Antiperovskite Compounds Othersupporting

confidence: 61%

Research Progress on Ni-Based Antiperovskite Compounds

Tong

Sun

2012

Advances in Condensed Matter Physics

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“…The quantity [1/(10C 4/3 dy/dt)] −1/2 is numerically estimated as ∼ 1.4 [76]. This generalized Rhodes-Wohlfarth relation between p eff /p s and T C /T 0 has been experimentally confirmed in a number of ferromagnetic compounds in the 3d electrons systems [85][86][87][88][89][90][91][92][93][94][95][96]. The spin fluctuation parameters for the uranium feromagnetic superconductors UGe 2 , URhGe and UCoGe have been reported by Deguchi, Takahashi, and Sato [76,100].…”

Section: B Takahashi's Spin Fluctuation Theorymentioning

confidence: 77%

“…This assumption is reasonable, considering the weak temperature dependence of the spin amplitude in the order of T C seen in neutron-scattering experiments on MnSi [78] and Y 0.97 Sc 0.03 Mn 2 [79], and theoretical calculations with the Hubbard models [80][81][82][83] and the Moriya's SCR theory [84]. The effectiveness of the theory has been confirmed in a number of experimental studies on intermetallic compounds of the 3d transition metals [85][86][87][88][89][90][91][92][93][94][95][96].…”

Section: B Takahashi's Spin Fluctuation Theorymentioning

confidence: 79%

Itinerant ferromagnetism in actinide 5f -electron systems: Phenomenological analysis with spin fluctuation theory

et al. 2017

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We have carried out an analysis of magnetic data in 69 uranium, 7 neptunium and 4 plutonium ferromagnets with the spin fluctuation theory developed by Takahashi (Y. Takahashi, J. Phys. Soc. Jpn. 55, 3553 (1986)). The basic and spin fluctuation parameters of the actinide ferromagnets are determined and the applicability of the spin fluctuation theory to actinide 5f system has been discussed. Itinerant ferromagnets of the 3d transition metals and their intermetallics follow a generalized Rhodes-Wohlfarth relation between p eff /ps and TC/T0, viz., p eff /ps ∝ (TC/T0) −3/2 . Here, ps, p eff , TC, and T0 are the spontaneous and effective magnetic moments, the Curie temperature and the width of spin fluctuation spectrum in energy space, respectively. The same relation is satisfied for TC/T0 < 1.0 in the actinide ferromagnets. However, the relation is not satisfied in a few ferromagnets with TC/T0 ∼ 1.0 that corresponds to local moment system in the spin fluctuation theory. The deviation from the theoretical relation may be due to several other effects not included in the spin fluctuation theory such as the crystalline electric field effect on the 5f electrons from ligand atoms. The value of the spontaneous magnetic moment ps increases linearly as a function of TC/T0 in the uranium and neptunium ferromagnets below (TC/T0) kink = 0.32 ± 0.02 where a kink structure appears in relation between the two quantities. ps increases more weakly above (TC/T0) kink . A possible interpretation with the TC/T0-dependence of ps is given.PACS numbers: * Phys. Rev. B. 96, 035125 (2017). † Electronic address: tateiwa.naoyuki@jaea.go.jp and conduction states. In actinide metallic compounds, the degree of localization of the 5f electrons differs in different compounds, ranging from strongly localized to itinerant character. The 3d electrons in transition metals also show various degree of localization. Differences between the 5f and 3d electrons are the smaller sensitivity to the crystal field (CF) from ligand atoms and the stronger spin-orbit coupling in the 5f s. The interplay of the spin and the unquenched orbital degrees of freedom gives rise to the peculiar features of the observed physical phenomena in actinide compounds.While many theoretical studies have been done for the role of the 5f electrons on their interesting physical properties [1][2][3], the behavior of the 5f electrons has not been fully elucidated yet. When the 5f electrons have strongly localized character at higher temperature, a Kondo-lattice picture may be appropriate for understanding the formation of the strongly correlated electric states at low temperatures as has been established in the 4f electrons system of the rare-earth cerium (Ce) and ytterbium (Yb) compounds [5][6][7]. Certainly, some actinide compounds show behaviors reminiscent of the Kondo effect such as the logarithmic temperature dependence of the electrical resistivity (ρ ∼ -lnT ). But not all physical properties in actinide compounds have been consis-

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“…This implies larger hole masses and a more flat energy dispersion; that in turn, can imply lower hole mobility but larger band-edge absorption. In CZTSSe, the hole masses are governed by the spin-orbit interaction which forms a strong band dispersion at the very VBM; here, one needs to consider that even moderate band-filling in p-type material will change the value if the hole mass at the quasi-Fermi level [19,20].…”

Section: Electronic Propertiesmentioning

confidence: 99%

Exploring the electronic and optical properties of Cu₂Sn_1−xGe_xS₃ and Cu₂Sn_1−xSi_xS₃ (x = 0, 0.5, and 1)

Chen

Persson

2017

Physica Status Solidi (b)

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In order to accelerate for environmental friendly thin-film photovoltaic industry, earth-abundant, non-toxic, and low-cost absorber materials are demanded. We study the compounds of Cu 2 Sn 1-x Ge x S 3 and Cu 2 Sn 1-x Si x S 3 (x = 0, 0.5, and 1) employing first-principles method within the density functional theory. Comparable band dispersions for all compounds are found. Moreover, the band-gap energies E g of those materials can be tailored by cation alloying the Sn atoms with Ge or Si. The gap energies of Cu 2 Sn 1-x Ge x S 3 and Cu 2 Sn 1-x Si x S 3 , with x = 0, 0.5, and 1, vary almost linearly from 0.83 to 1.43 and 2.60 eV, respectively. However, the gap energy of Cu 2 SiS 3 does not follow the linear relation for x > 0.8. The effective electron masses of lowest conduction band at the Γ-point are relatively isotropic for all materials, which are between 0.15 and 0.25 m 0 in (010) direction, and between 0.13 and 0.22 m 0 in (001) direction. On the other hand, the effective hole masses of topmost valence band at the Γ-point show very strong anisotropy for all compounds. In the (010) direction, the hole masses are estimated to be between 1.01 and 1.85 m 0 , while between 0.11 and 0.41 m 0 in the (001) direction. Calculations reveal that all compounds have relatively high absorption coefficients, comparable with that of Cu 2 ZnSnS 4 . However, the absorption coefficients in the energy region E g + 0.5 to E g + 1 eV are higher for Cu 2 GeS 3 , Cu 2 SiS 3 , and Cu 2 Sn 0.5 Si 0.5 S 3 compared with Cu 2 ZnSnS 4 . Here, a dense k-mesh is required in order to observe the details of absorption spectra, especially near band-gap region. The high-frequency dielectric constants of all compounds are between 6.2 and 7.5, which are similar to the one of Cu 2 ZnSnS 4 (~6.7). Therefore, Cu 2 Sn 1-x Ge x S 3 and Cu 2 Sn 1-x Si x S 3 can be potential candidates as absorber materials in thin-film solar cells.

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Synthesis and Magnetic Properties of Ni₃AlC_x

Cited by 13 publications

References 13 publications

Research Progress on Ni-Based Antiperovskite Compounds

Research Progress on Ni-Based Antiperovskite Compounds

Itinerant ferromagnetism in actinide 5f -electron systems: Phenomenological analysis with spin fluctuation theory

Exploring the electronic and optical properties of Cu₂Sn_1−xGe_xS₃ and Cu₂Sn_1−xSi_xS₃ (x = 0, 0.5, and 1)

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Synthesis and Magnetic Properties of Ni3AlCx

Cited by 13 publications

References 13 publications

Research Progress on Ni-Based Antiperovskite Compounds

Research Progress on Ni-Based Antiperovskite Compounds

Itinerant ferromagnetism in actinide 5f -electron systems: Phenomenological analysis with spin fluctuation theory

Exploring the electronic and optical properties of Cu2Sn1−xGexS3 and Cu2Sn1−xSixS3 (x = 0, 0.5, and 1)

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Synthesis and Magnetic Properties of Ni₃AlC_x

Exploring the electronic and optical properties of Cu₂Sn_1−xGe_xS₃ and Cu₂Sn_1−xSi_xS₃ (x = 0, 0.5, and 1)