Electronic structure of mixed-valence and charge-ordered Sm and Eu pnictides and chalcogenides

Antonov, V. N.; Harmon, B. N.; Yaresko, A. N.

doi:10.1103/physrevb.72.085119

Cited by 31 publications

(24 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The LSDA+U partial DOSs of antiferromagnetic (AF) Sm 4 Bi 3 are shown in Figure 81 [455]. In order to imitate the nonmagnetic (J = 0) ground state of Sm 2+ ion the exchange-correlation potential is taken to be the same for both spin states within the corresponding atomic spheres.…”

Section: Sm 4 Bimentioning

confidence: 99%

Electronic Structure of Strongly Correlated Systems

Antonov

Bekenov

Yaresko

2011

Advances in Condensed Matter Physics

Self Cite

View full text Add to dashboard Cite

The article reviews the rich phenomena of metal-insulator transitions, anomalous metalicity, taking as examples iron and titanium oxides. The diverse phenomena include strong spin and orbital fluctuations, incoherence of charge dynamics, and phase transitions under control of key parameters such as band filling, bandwidth, and dimensionality. Another important phenomena presented in the article is a valence fluctuation which occur often in rare-earth compounds. We consider some Ce, Sm, Eu, Tm, and Yb compounds such as Ce, Sm and Tm monochalcogenides, Sm and Yb borides, mixed-valent and charge-ordered Sm, Eu and Yb pnictides and chalcogenides R4X3and R3X4(R = Sm, Eu, Yb; X = As, Sb, Bi), intermediate-valence YbInCu4and heavy-fermion compounds YbMCu4(M = Cu, Ag, Au, Pd). Issues addressed include the nature of the electronic ground states, the metal-insulator transition, the electronic and magnetic structures. The discussion includes key experiments, such as optical and magneto-optical spectroscopic measurements, x-ray photoemission and x-ray absorption, bremsstrahlung isochromat spectroscopy measurements as well as x-ray magnetic circular dichroism.

show abstract

Section: Sm 4 Bimentioning

confidence: 99%

Electronic Structure of Strongly Correlated Systems

Antonov

Bekenov

Yaresko

2011

Advances in Condensed Matter Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Actually, trivalent europium was found to exhibit Van Vleck paramagnetism in europium nitrides15. Interestingly, according to Antonov et al21, the same holds for Eu 3 S 4, i.e., only the Eu ++ ions carry a magnetic moment which is equal to 7 μ B /ion. This allows us to treat the magnetism of EuS in our samples as a problem of mean value and neglect the real crystallographic structure.…”

Section: Resultsmentioning

confidence: 93%

Direct evidence for significant spin-polarization of EuS in Co/EuS multilayers at room temperature

Pappas

Poulopoulos

Lewitz

et al. 2013

Sci Rep

View full text Add to dashboard Cite

The new era of spintronics promises the development of nanodevices, where the electron spin will be used to store information and charge currents will be replaced by spin currents. For this, ferromagnetic semiconductors at room temperature are needed. We report on significant room-temperature spin polarization of EuS in Co/EuS multilayers recorded by x-ray magnetic circular dichroism (XMCD). The films were found to contain a mixture of divalent and trivalent europium, but only Eu++ is responsible for the ferromagnetic behavior of EuS. The magnetic XMCD signal of Eu at room temperature could unambiguously be assigned to magnetic ordering of EuS and was found to be only one order of magnitude smaller than that at 2.5 K. The room temperature magnetic moment of EuS is as large as the one of bulk ferromagnetic Ni. Our findings pave the path for fabrication of room–temperature spintronic devices using spin polarized EuS layers.

show abstract

“…Europium is trivalent in ionic and some metallic compounds and the total momentum of the 4f shell is zero (J = 0). Several europium pnictidies and chalcogenides exhibit the mixed-valence phase transition ( [2] and references cited therein). In the EuF 3 compound, Eu exhibits the Eu 3+ (4f 6 ) state with possible surface valence transition to Eu 2+ state [3,4].…”

Section: Introduction and Computational Detailsmentioning

confidence: 99%

“…In polycrystalline EuT 2 X 2 , where T is the transition metal and X = Si or Ge, the valence of europium is unstable and depends on temperature, pressure and composition (Si ↔ Ge substitution) ( [5] and references cited therein). The valence of metallic Eu and in its compounds was the subject of the theoretical band structure investigations [1,2], but the EuF 3 and EuCo 2 X 2 compounds were * Corresponding author at: ul. Bankowa not studied up to now.…”

Section: Introduction and Computational Detailsmentioning

confidence: 99%