Possible room-temperature signatures of unconventional 
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-electron quantum criticality in 
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Eichenberger, L.; Magnette, A.; Malterre, D.; Sibille, Romain; Baudelet, F.; Nataf, Lucie; Mazet, Thomas

doi:10.1103/physrevb.101.020408

Cited by 9 publications

(29 citation statements)

References 35 publications

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“…That is further discussed in section 4. In all cases, the mean Yb valence is lower than the 'magnetic limit' value of υ ~ 2.73 found in YbMn6Ge6-xSnx below which Yb is no longer magnetic [9,10].…”

Section: Xanes and Xmcdmentioning

confidence: 59%

“…In this series of compounds, the Yb magnetic ordering temperature reaches record values up to TYb = 125 K [6,9], the Yb magnetic instability 2 occurs for far from trivalent Yb (υ ~ 2.73) and signatures of quantum criticality persists up to room temperature [10]. These unusual phenomena have been ascribed to the strong Mn-Yb exchange interactions [7][8][9][10], i.e. to the strong exchange field Hex [11] generated at the Yb site by the neighboring Mn moments.…”

Section: Introductionmentioning

confidence: 90%

“…The spectra only comprise a weak and negative signal near E ~ 8.950 keV, which is due to spin-dependent hybridization between the 5d states of Yb and the self-polarized 3d states of the T = Mn/Fe transition metal sublattice [22]. In presence of 4f magnetism, the spectra would in addition comprise two more intense peaks of opposite sign: a positive one of dipolar origin and a negative one from quadrupolar origin near E ~ 8.937 keV [10]. The weak negative signal decreases in magnitude upon Fe doping, suggesting a reduction in the polarization of the 5d states of Yb by the T sublattice.…”

Section: Xanes and Xmcdmentioning

confidence: 99%

“…Recently, we showed that the situation is somewhat different in YbMn6Ge6-xSnx where intermediate valent Yb is alloyed with a ferromagnetic Mn sublattice [6][7][8][9][10]. In this series of compounds, the Yb magnetic ordering temperature reaches record values up to TYb = 125 K [6,9], the Yb magnetic instability 2 occurs for far from trivalent Yb (υ ~ 2.73) and signatures of quantum criticality persists up to room temperature [10]. These unusual phenomena have been ascribed to the strong Mn-Yb exchange interactions [7][8][9][10], i.e.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Fe doping on the Yb valence state and the magnetic structures in HoFe6Sn6-type YbMn6−yFeySn6 alloys (y ≤ 1.00)

Magnette

Eichenberger

Diop

et al. 2021

Journal of Alloys and Compounds

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We determine the magnetic structures of HoFe6Sn6-type (Immm) YbMn6-yFeySn6 alloys (y = 0.25, 0.50, 0.75 and 1.00) from powder neutron diffraction experiments. The valence state and local magnetism of Yb are investigated using X-ray Near Edge Spectroscopy (XANES) and X-ray Magnetic Circular Dichroism (XMCD) at the Yb L3 edge. The mean Yb valence decreases upon Fe doping (from υ ~ 2.66 down to υ ~ 2.46) and there is no 4f Yb magnetism throughout the series. The Fe for Mnsubstitution leads to change in the spins arrangement of the 3d sublattice by reinforcing antiferromagnetic exchange interactions without significant change in T = Mn/Fe moment magnitude (m ~ 2.35 µB). The ground state of the alloy with y = 0.25 is ferromagnetic whilst Fe richer alloys are helimagnets with wave-vector k = 0, qy, 0. The turn-angle increase upon Fe doping manifests by a mitigation of the Yb L3 dichroic effect, solely due to hybridization between its 5d states and the selfpolarized 3d states of T.

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Section: Xanes and Xmcdmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 90%

Section: Xanes and Xmcdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Fe doping on the Yb valence state and the magnetic structures in HoFe6Sn6-type YbMn6−yFeySn6 alloys (y ≤ 1.00)

Magnette

Eichenberger

Diop

et al. 2021

Journal of Alloys and Compounds

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“…It is known that the electronic and magnetic properties of Yb strongly depend on the properties of its partner [3,[20][21][22][23][24][25][26][27][28]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Pressure influence on the valence and magnetic state of Yb ions in noncentrosymmetric heavy-fermion YbNiC2

et al. 2021

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We present studies of neutron diffraction, electrical resistivity, magnetic susceptibility, magnetization, and specific heat of noncentrosymmetric YbNiC 2 . At normal pressure, YbNiC 2 is a moderate heavy-fermion compound with Kondo lattice. At 16 K we observe an anomaly in the temperature dependence of specific heat which is ascribed to an abrupt valence change of Yb ions. At pressures above 7 GPa, the valence change and the Kondo lattice state are suppressed, and near a temperature of 10 K we detect the appearance of magnetic order. Above 5 GPa, the temperature dependence of the resistivity behaves similarly to other compounds of the CeNiC 2 -type family, indicating the formation of charge density waves. This is attributed to the nesting properties of the Fermi surface (FS) found within the density functional theory + dynamical mean field theory treatment. Our ab initio calculations also show that the valence of Yb in YbNiC 2 at normal conditions is 2.85, which increases with temperature and pressure. The FS of YbNiC 2 is anisotropic in shape in comparison with the 3D surface of YbCoC 2 .

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Enhanced Sommerfeld coefficient near the quantum critical point in YbMn6Ge6−xSnx

Haraux

Eichenberger

Diop

et al. 2022

Solid State Communications

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Possible room-temperature signatures of unconventional 4f -electron quantum criticality in YbMn6Ge6−xSn

Cited by 9 publications

References 35 publications

Influence of Fe doping on the Yb valence state and the magnetic structures in HoFe6Sn6-type YbMn6−yFeySn6 alloys (y ≤ 1.00)

Influence of Fe doping on the Yb valence state and the magnetic structures in HoFe6Sn6-type YbMn6−yFeySn6 alloys (y ≤ 1.00)

Pressure influence on the valence and magnetic state of Yb ions in noncentrosymmetric heavy-fermion YbNiC2

Enhanced Sommerfeld coefficient near the quantum critical point in YbMn6Ge6−xSnx

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