NMR study of the ternary carbides<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>M</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Al</mml:mi><mml:mi mathvariant="normal">C</mml:mi></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>M</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant="normal">Ti</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="normal">V</mml:mi><

Lue, Chin‐Shan; Lin, Jingjun; Xie, Bingxing

doi:10.1103/physrevb.73.035125

Cited by 42 publications

(30 citation statements)

References 29 publications

(38 reference statements)

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“…[16][17][18] For the present alloys, the relaxation of Al nuclei is dominated by their coupling to the spin of the s-character electrons. In the absence of the collective electron effects, the relaxation rate is simply governed by the initial occupied and final unoccupied electronic states, associated with the hyperfine field arising from contact electrons.…”

Section: Discussionmentioning

confidence: 89%

NMR probe of pseudogap characteristics inCaAl2−xSi2+x

2007

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We report the results of a 27 Al nuclear magnetic resonance ͑NMR͒ study of CaAl 2−x Si 2+x , near the stoichiometric composition with x = 0. The low-temperature NMR relaxation rates for stoichiometric ͑x =0͒ and nonstoichiometric ͑x = −0.1 and 0.1͒ compounds follow a Korringa law, associated with a finite density of carriers at the Fermi level. High-temperature relaxation rates for x ജ 0 go over to a semiconductorlike activated form, providing information about the electronic structure near the Fermi energy. The results are consistent with pseudogap features identified by recent band-structure calculations. An analysis of the pseudogap change vs composition further points out that the band-filling picture is proper for the understanding of the NMR observations in CaAl 2−x Si 2+x .

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Section: Discussionmentioning

confidence: 89%

NMR probe of pseudogap characteristics inCaAl2−xSi2+x

2007

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“…[18][19][20] In the absence of collective electron effects, the relaxation rate is simply governed by the initial occupied and final unoccupied electronic states, associated with the hyperfine field arising from contact electrons. Therefore, 1/T 1K T can be written as…”

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confidence: 99%

Evolution of the pseudogap in Sr1−xYxAl

2011

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With the aim of providing microscopic information about the electronic characteristics of SrAl 2 Si 2 and effects of chemical substitution on its pseudogap features, we carried out a study on Sr 1−x Y x Al 2 Si 2 (x = 0, 0.05, 0.1, and 0.15) by means of 27 Al nuclear magnetic resonance (NMR) spectroscopy. For stoichiometric SrAl 2 Si 2 , the temperature-dependent NMR Knight shift and spin-lattice relaxation rate are associated with a sharp feature in the electronic density of state within a pseudogap at around the Fermi level. On the other hand, the NMR observations for Y-substituted compounds exhibit ordinary metallic behavior, suggesting that the Fermi level has moved out of the pseudogap for these materials, resulting in the dominant Korringa process responsible for the observed relaxation rates.

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“…However other measurement35 for AFM Cr 2 AlC obtained a value of 0.64 μ B . Our computed sum of the absolute magnetic moment of spin-up and spin-down directions is 5.3749 μ B in AFM Cr 2 AlC in one unit cell (four Cr atoms, 0.6719 μ B per Cr atom), consisting well with previous calculations27, in particular with the calculations FM Cr 2 AlC36 (0.7 μ B ), Cr 2 AlC27 (0.7 μ B at U = 0 eV), Cr 2 GaC37 (0.75 u B ).…”

Section: Resultsmentioning

confidence: 84%

Magnetic moment collapse induced axial alternative compressibility of Cr2TiAlC2 at 420 GPa from first principle

Yang

Rong-Feng

Qing-He

et al. 2016

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The electronic structure and thermodynamical properties of Cr2TiAlC2 are studied by first principles under pressure. The obtained results observed that the ferromagnetic order is the most stable ground state and the magnetic moment will collapse at about 50 GPa. As a result, the lattice a axis becomes stiffer above about 420 GPa, ultimately presenting the same axial compressibility trends with those of nonmagnetic compounds Mo2TiAlC2 and hypothetical Cr2TiAlC2. The elastic constants and phonon dispersion curves demonstrate the structural stability during the disappearance of magnetic moment and occurrence of axial alternative compressibility. The density of states and energy band calculations confirmed the existence of magnetic moment of Cr2TiAlC2 at 0 GPa and disappearance at high pressures above 50 GPa. Evolutions of magnetic moment collapse with pressure are confirmed by a variety of properties. The obtained grüneisen parameter and thermal expansion coefficients show the maximum value among the known MAX phases, to date and to the author’s knowledge.

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NMR study of the ternary carbidesM2AlC(M=Ti,V<

Cited by 42 publications

References 29 publications

NMR probe of pseudogap characteristics inCaAl2−xSi2+x

NMR probe of pseudogap characteristics inCaAl2−xSi2+x

Evolution of the pseudogap in Sr1−xYxAl

Magnetic moment collapse induced axial alternative compressibility of Cr2TiAlC2 at 420 GPa from first principle

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