Spin-glass ordering and absence of valence fluctuations of Eu in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>EuCu</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Si</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>single crystals

Wang, P.; Stadnik, Z. M.; Żukrowski, J.; Cho, B. K.; Kim, J. Y.

doi:10.1103/physrevb.82.134404

Cited by 10 publications

(6 citation statements)

References 40 publications

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“…This lets us consider that the specific anomaly comes from freezing of non-ordered Eu 2+ spins, i.e., a spin glass transition. Similar observation was reported in (Eu,Sr)S [40] and EuCu 2 Si 2 [41]. To extract C m below 10 K more accurately, the C(T ) data from 10 K to 20 K was fitted by a polynomial with odd-power terms, C ≈ C el + C lat = A 1 T + A 3 T 3 + A 5 T 5 + A 7 T 7 (the resultant A 1 and A 3 agree well with the above γ and β values).…”

Section: E Specific Heatsupporting

confidence: 90%

Possible charge-density wave, superconductivity, andf-electron valence instability inEuBiS2F

et al. 2014

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Superconductivity (SC) and charge-density wave (CDW) are two contrasting yet relevant collective electronic states which have received sustained interest for decades. Here we report that, in a layered europium bismuth sulfofluoride, EuBiS2F, a CDW-like transition occurs at 280 K, below which SC emerges at 0.3 K, without any extrinsic doping. The Eu ions were found to exhibit an anomalously temperature-independent mixed valence of about +2.2, associated with the formation of CDW. The mixed valence of Eu gives rise to self electron doping into the conduction bands mainly consisting of the in-plane Bi-6p states, which in turn brings about the CDW and SC. In particular, the electronic specific-heat coefficient is enhanced by ∼ 50 times, owing to the significant hybridizations between Eu-4f and Bi-6p electrons, as verified by band-structure calculations. Thus, EuBiS2F manifests itself as an unprecedented material that simultaneously accommodates SC, CDW and f -electron valence instability.

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Section: E Specific Heatsupporting

confidence: 90%

Possible charge-density wave, superconductivity, andf-electron valence instability inEuBiS2F

et al. 2014

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“…However, in most spin-glass systems, the magnitude of the AC susceptibility below T max is frequency-dependent and becomes independent of the frequency above T max . [30] Therefore, the observed dependence of the magnitude of the AC susceptibility above and below T max upon frequencies (Figure 4, b, inset) suggests that the downturn on the magnetic-susceptibility curves (ZFC and FC) of MnSb 2 Se 4 is more complicated in nature. A tentative explanation of this behavior is provided below.…”

Section: Magnetismmentioning

confidence: 90%

Crystal Structure, Charge Transport, and Magnetic Properties of MnSb₂Se₄

et al. 2011

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Keywords: Manganese / Antimony / Selenium / Semiconductors / Magnetic properties / Thermoelectricity A single phase of MnSb 2 Se 4 was synthesized by combining high-purity elements at 773 K. Single-crystal X-ray diffraction revealed that MnSb 2 Se 4 is isostructural with FeSb 2 Se 4 crystallizing in the monoclinic space group C2/m with a = 13.076(3) Å, b = 3.965(2) Å, c = 15.236(4) Å, β = 115.1(2)°, Z = 4. MnSb 2 Se 4 melts congruently at 790 K and is thermally stable up to 1000 K. Electronic band structure calculations, infrared diffuse reflectance spectroscopy, and low-temperature electronic transport data indicate that MnSb 2 Se 4 is a narrow-bandgap p-type semiconductor with an energy

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“…The valence state of europium in EuCu 2 Si 2 is known to be quite sensitive to the sample preparation method and, in some cases, Eu ions were even found to be in a pure divalent state instead of mixed valence [17][18][19][20]. Single-crystal specimens were found to be more prone to this problem than powder samples, which usually exhibit a clear intermediate valence (IV), as derived from their lattice constants.…”

Section: Samples and Experimental Detailsmentioning

confidence: 99%

“…Single-crystal specimens were found to be more prone to this problem than powder samples, which usually exhibit a clear intermediate valence (IV), as derived from their lattice constants. A detailed discussion of this problem is given in [19]. On the other hand, for powder samples the characteristic problem is the presence of the so-called satellite phase where europium is nearly divalent [21].…”

Section: Samples and Experimental Detailsmentioning

confidence: 99%

Magnetic excitations in EuCu₂(Si_xGe_1−x)₂: from mixed valence towards magnetism

Alekseev¹,

Nemkovski²,

Mignot³

et al. 2012

J. Phys.: Condens. Matter

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We report the inelastic neutron scattering study of spin dynamics in EuCu(2)(Si(x)Ge(1-x))(2) (x = 1, 0.9, 0.75, 0.6), performed in a wide temperature range. At x = 1 the magnetic excitation spectrum was found to be represented by the double-peak structure well below the energy range of the Eu(3+) spin-orbit (SO) excitation (7)F(0)→(7)F(1), so that at least the high-energy spectral component can be assigned to the renormalized SO transition. Change of the Eu valence towards 2 + with increased temperature and/or Ge concentration results in further renormalization (lowering the energy) and gradual suppression of both inelastic peaks in the spectrum, along with developing sizeable quasielastic signal. The origin of the spectral structure and its evolution is discussed in terms of excitonic model for the mixed valence state.

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Spin-glass ordering and absence of valence fluctuations of Eu inEuCu2Si2single crystals

Cited by 10 publications

References 40 publications

Possible charge-density wave, superconductivity, andf-electron valence instability inEuBiS2F

Possible charge-density wave, superconductivity, andf-electron valence instability inEuBiS2F

Crystal Structure, Charge Transport, and Magnetic Properties of MnSb₂Se₄

Magnetic excitations in EuCu₂(Si_xGe_1−x)₂: from mixed valence towards magnetism

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Spin-glass ordering and absence of valence fluctuations of Eu inEuCu2Si2single crystals

Cited by 10 publications

References 40 publications

Possible charge-density wave, superconductivity, andf-electron valence instability inEuBiS2F

Possible charge-density wave, superconductivity, andf-electron valence instability inEuBiS2F

Crystal Structure, Charge Transport, and Magnetic Properties of MnSb2Se4

Magnetic excitations in EuCu2(SixGe1−x)2: from mixed valence towards magnetism

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Crystal Structure, Charge Transport, and Magnetic Properties of MnSb₂Se₄

Magnetic excitations in EuCu₂(Si_xGe_1−x)₂: from mixed valence towards magnetism