One Subject, Two Lands: My Journey in Condensed Matter Physics

Ramakrishnan, T. V.

doi:10.1146/annurev-conmatphys-031115-011442

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…Homogeneous mixed-valence compounds have attracted much attention in recent years because of valence fluctuations, which in their inhomogeneous mixed-valence counterparts are due to thermally activated hopping between equivalent cation sites [1][2][3]. A prominent inhomogeneous mixedvalence compound Eu 3 S 4 with equivalent Eu sites at room temperature, but inequivalent Eu 2+ and Eu 3+ sites at low temperature, represents an ideal test case [4].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, sintering, specific heat and magnetism of Eu₃S₄ by low-temperature CS₂-gas sulfurization of Eu₂O₃ nanospheres

Chen

Hirai

2018

Materials Science-Poland

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Single-phase Eu3S4 was obtained via CS2 gas sulfurization of Eu2O3 nanospheres at 773 K for longer than 0.5 h. The primary particle size of Eu3S4 became larger than that of Eu2O3 during the sulfurization process. Pure synthetic Eu3S4 powders were unstable and transformed to EuS at 873 K under vacuum. Eu3S4 compacts were sintered in temperature range of 773 K to 1173 K and they transformed to EuS at 1473 K during spark plasma sintering. Specific heat of sintered Eu3S4 did not show an anomalous behavior in the range of 2 K to 50 K. The magnetic susceptibility of polycrystalline Eu3S4 followed a Curie-Weiss law from 2 K to 300 K. Magnetization of polycrystalline Eu3S4 was larger than that of single crystal Eu3S4 when the magnetic field was less than 3.5 kOe.

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Section: Introductionmentioning

confidence: 99%

Synthesis, sintering, specific heat and magnetism of Eu₃S₄ by low-temperature CS₂-gas sulfurization of Eu₂O₃ nanospheres

Chen

Hirai

2018

Materials Science-Poland

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Crystal structure and magnetism inα−RuCl3: Anab initiostudy

2016

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α-RuCl3 has been proposed recently as an excellent playground for exploring Kitaev physics on a twodimensional (2D) honeycomb lattice. However, structural clarification of the compound has not been completed, which is crucial in understanding the physics of this system. Here, using ab-initio electronic structure calculations, we study a full three dimensional (3D) structure of α-RuCl3 including the effects of spin-orbit coupling (SOC) and electronic correlations. Three major results are as follows; i) SOC suppresses dimerization of Ru atoms, which exists in other Ru compounds such as isostructural Li2RuO3, and making the honeycomb closer to an ideal one. ii) The nearest-neighbor Kitaev exchange interaction between the j eff =1/2 pseudospin depends strongly on the Ru-Ru distance and the Cl position, originating from the nature of the edge-sharing geometry.iii) The optimized 3D structure without electronic correlations has P31m space group symmetry independent of SOC, but including electronic correlation changes the optimized 3D structure to either C2/m or Cmc21 within 0.1 meV per formula unit (f.u.) energy difference. The reported P 3112 structure is also close in energy. The interlayer spin exchange coupling is a few percent of in-plane spin exchange terms, confirming α-RuCl3 is close to a 2D system. We further suggest how to increase the Kitaev term via tensile strain, which sheds new light in realizing Kitaev spin liquid phase in this system.

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One Subject, Two Lands: My Journey in Condensed Matter Physics

Cited by 2 publications

References 23 publications

Synthesis, sintering, specific heat and magnetism of Eu₃S₄ by low-temperature CS₂-gas sulfurization of Eu₂O₃ nanospheres

Synthesis, sintering, specific heat and magnetism of Eu₃S₄ by low-temperature CS₂-gas sulfurization of Eu₂O₃ nanospheres

Crystal structure and magnetism inα−RuCl3: Anab initiostudy

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One Subject, Two Lands: My Journey in Condensed Matter Physics

Cited by 2 publications

References 23 publications

Synthesis, sintering, specific heat and magnetism of Eu3S4 by low-temperature CS2-gas sulfurization of Eu2O3 nanospheres

Synthesis, sintering, specific heat and magnetism of Eu3S4 by low-temperature CS2-gas sulfurization of Eu2O3 nanospheres

Crystal structure and magnetism inα−RuCl3: Anab initiostudy

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Synthesis, sintering, specific heat and magnetism of Eu₃S₄ by low-temperature CS₂-gas sulfurization of Eu₂O₃ nanospheres

Synthesis, sintering, specific heat and magnetism of Eu₃S₄ by low-temperature CS₂-gas sulfurization of Eu₂O₃ nanospheres