Structure and magnetic order of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">EuB</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Süllow, S.; Prasad, Ishan; Aronson, M. C.; Sarrao, J. L.; Fisk, Z.; Hristova, D.; Lacerda, A.; Hundley, M. F.; Vigliante, A.; Gibbs, Doon

doi:10.1103/physrevb.57.5860

Cited by 153 publications

(179 citation statements)

References 36 publications

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“…It was found that the [111] spin configuration is 3.2 meV/EuB 6 lower in energy than the [100] one, in agreement with the magnetic characterization data from the literature [7].…”

Section: Resultssupporting

confidence: 87%

“…The intriguing fact concerning EuB 6 is that symmetry constraints prevent the occurrence of FM order in the cubic O h space group [19,7]. Lattice symmetry must be lowered to one of the O h tetragonal subgroups to allow ferromagnetism [7,19].…”

Section: Introductionmentioning

confidence: 99%

“…Lattice symmetry must be lowered to one of the O h tetragonal subgroups to allow ferromagnetism [7,19]. High resolution T -dependent x-ray diffraction measurements by Süllow et al [7] failed to observe direct evidence of this symmetry breaking.…”

Section: Introductionmentioning

confidence: 99%

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Evidence for a subtle structural symmetry breaking in EuB₆

Martinho¹,

Rettori²,

Dalpian³

et al. 2009

J. Phys.: Condens. Matter

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This work presents a systematic Raman scattering study and first-principles calculations for the EuB 6 system. Evidence for the presence of an incipient (∼1×10 −4Å ) tetragonal symmetry break of its crystalline structure was found. Forbidden Raman modes at ω fRm(1) ∼ 1170 cm −1 , ω fRm(2) ∼ 1400 cm −1 , and ω fRm(3) ∼ 1500 cm −1 were observed. The tetragonal symmetry of ω fRm(2) and ω fRm(3) together with spin-polarized first-principles simulations of the structural and magnetic properties fully support such a break of symmetry. Our data and calculations explain the occurrence of ferromagnetism in Eu hexaborides, previously reported.

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“…It was found that the [111] spin configuration is 3.2 meV/EuB 6 lower in energy than the [100] one, in agreement with the magnetic characterization data from the literature [7].…”

Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evidence for a subtle structural symmetry breaking in EuB₆

Martinho¹,

Rettori²,

Dalpian³

et al. 2009

J. Phys.: Condens. Matter

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“…The calculated equilibrium volume of 70.1Å 3 is about 96 % of the experimental value. 3 The calculated bulk modulus of 161 GPa is agrees very well with the experimental value. 21 The present results were obtained with U=7 eV, however similar calculations performed for U=6, 8, and 9 eV (without optimization of the internal parameter) showed that the bulk properties are insensitive to the value of U.…”

Section: A Bulk Propertiessupporting

confidence: 77%

Kondo and anti-Kondo coupling to local moments inEuB6

Kuneš

Pickett

2004

Phys. Rev. B

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With a treatment of the 4f states of EuB6 based on LDA+U method, the mixing of Eu f states with B p states around the X point of the Brillouin zone is shown to have unexpected consequences for the effective exchange interactions. We analyze in detail the orbital character of electronic states close to the Fermi level and discuss the effective exchange between the itinerant electrons and the local 4f moments. The analysis suggests that the ordered phase may provide the first example of a half metallic semimetal, and that the physics of EuB6 should be described in terms of a two band Kondo lattice model with parallel (ferromagnetic) coupling of the conduction electrons and antiparallel (antiferromagnetic) coupling of the valence electrons to the local 4f moments.

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“…The T-linear behaviour followed by a broad hump in C mag (T )/T near T N /3 signals possible FM ordering inside of the AFM state as explained by Fishman and Liu [47]. In general, the plateau like behaviour is observed in C mag (T )/T for high S values due to the splitting of ground state multiplet by the internal magnetic field below the magnetic ordering [48]. Our physical property measurement and detailed analysis hints at a double magnetic transition but without microscopic probes it may not be possible to conclude the reason for the broad hump in C mag (T )/T below T N .…”

Section: Heat Capacitymentioning

confidence: 63%

Magnetic, specific heat and electrical transport properties of Frank–Kasper cage compounds RTM₂Al₂₀[R = Eu, Gd and La; TM = V, Ti]

Kumar

Nair

Reinke

et al. 2016

J. Phys.: Condens. Matter

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Abstract. Single crystals of Frank-Kasper compounds RTM 2 Al 20 (R = Eu, Gd and La; TM = V and Ti) were grown by self-flux method and their physical properties were investigated through magnetization (M ), magnetic susceptibility (χ), specific heat (C P ) and electrical resistivity (ρ) measurements. Powder x-ray diffraction studies and structural analysis showed that these compounds crystallize in the cubic crystal structure with the space group F d3m. The magnetic susceptibility for the compounds EuTi 2 Al 20 and GdTi 2 Al 20 showed a sudden jump below the Néel temperature T N indicative of plausible double magnetic transition. Specific heat (C P ) and electrical resistivity (ρ) measurements also confirm the first-order magnetic transition (FOMT) and possible double magnetic transitions. Temperature variation of heat capacity showed a sharp phase transition and huge C P value for the (Eu/Gd)Ti 2 Al 20 compounds Full width at half-maximum (FWHM) < 0.2 K) which is reminiscent of a first-order phase transition and a unique attribute among RTM 2 Al 20 compounds. In contrast, linear variation of C P is observed in the ordered state for (Eu/Gd)V 2 Al 20 compounds suggesting a λ-type transition. We observed clear anomaly between heating and cooling cycle in temperature-time relaxation curve for the compounds GdTi 2 Al 20 (2.38 K) and EuTi 2 Al 20 (3.2 K) which is indicating a thermal arrest due to the latent heat. The temperature variation of S mag for GdTi 2 Al 20 saturates to a value 0.95R ln 8 while the other magnetic systems exhibited still lower entropy saturation values in the high temperature limit. (C P − γT )/T 3 vs T plot showed a maximum near 27 K for all the compounds indicating the presence of low frequency Einstein modes of vibrations. Resistivity measurements showed that all the samples behave as normal Fermi liquid type compounds and ρ(T ) due to electron-phonon scattering follows Bloch-Grüneisen-Mott relation in the paramagnetic region.

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Structure and magnetic order ofEuB6

Cited by 153 publications

References 36 publications

Evidence for a subtle structural symmetry breaking in EuB₆

Evidence for a subtle structural symmetry breaking in EuB₆

Kondo and anti-Kondo coupling to local moments inEuB6

Magnetic, specific heat and electrical transport properties of Frank–Kasper cage compounds RTM₂Al₂₀[R = Eu, Gd and La; TM = V, Ti]

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Structure and magnetic order ofEuB6

Cited by 153 publications

References 36 publications

Evidence for a subtle structural symmetry breaking in EuB6

Evidence for a subtle structural symmetry breaking in EuB6

Kondo and anti-Kondo coupling to local moments inEuB6

Magnetic, specific heat and electrical transport properties of Frank–Kasper cage compounds RTM2Al20[R = Eu, Gd and La; TM = V, Ti]

Contact Info

Product

Resources

About

Evidence for a subtle structural symmetry breaking in EuB₆

Evidence for a subtle structural symmetry breaking in EuB₆

Magnetic, specific heat and electrical transport properties of Frank–Kasper cage compounds RTM₂Al₂₀[R = Eu, Gd and La; TM = V, Ti]