Correlation between transport properties and valence instability states of Eu ions in Lu Eu1−Cu2Si2

Kuzhel, B.; Belan, B.; Stets, I.

doi:10.1016/j.jallcom.2003.08.041

Cited by 2 publications

(1 citation statement)

References 10 publications

(15 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9) at low temperatures serve as a proof for our assumption. One can suggest the coexistence of an intermediate valence state and a Kondo state in this system, as in other systems of this type [12].…”

Section: Physical Propertiessupporting

confidence: 59%

Contribution of unstable valence states of europium to the electronic transport properties of EuPd2-xSi2+x

Kuzhel¹,

Belan²,

Kuzhel³

et al. 2010

Chem. Met. Alloys

View full text Add to dashboard Cite

The intermetallic alloy system EuPd 2-x Si 2+x (-0.2 ≤ ≤ ≤ ≤ х ≤ ≤ ≤ ≤ 0.75) (CeGa 2 Al 2 structure type) was studied by microstructure and compositional homogeneity analysis, X-ray absorption and diffraction at room temperature. Electrical resistivity and thermopower measurements were performed in the temperature range 5.0-300 K. According to data obtained by X-ray L III-absorption spectroscopy, resistivity and thermopower measurements, we can state that with increasing Si content there is a transition from an intermediate valence state (IV), through a Kondo type state (KS), to a stable Eu 2+ europium ion. We can also state that an intermediate valence state and a Kondo type state coexist at specific Pd/Si ratios. The decrease of the effective valence of the europium ion from 2.30 (x =-0.2) to almost 2.00 (x = 0.75) is accompanied by a decrease of the lattice parameter a and the a/c ratio. The investigation was carried out in the context of questions discussed for some time in the scientific community, namely: How is the transition type (stable europium ion-interconfiguration fluctuation state) related to the magnetic ordering state, Kondo type state, and to the intermediate valence state in this type of compound? Intermetallics / Electron-electron interactions / Electronic transport / Kondo effect / Valence fluctuations

show abstract

Section: Physical Propertiessupporting

confidence: 59%

Contribution of unstable valence states of europium to the electronic transport properties of EuPd2-xSi2+x

Kuzhel¹,

Belan²,

Kuzhel³

et al. 2010

Chem. Met. Alloys

View full text Add to dashboard Cite

show abstract

Electron Transport Properties of Eu(Cu1 − xAgx)2Si2 (0 ≤ x ≤ 1): Initiation of Transition Eu2+ ↔ Eu2.41+ in the Intermediate Valence State

Kuzhel,

Belan,

Gladyshevskii

et al. 2024

Advances in Condensed Matter Physics

View full text Add to dashboard Cite

The article presents the results of studies of the chemical composition, crystal structure, lattice parameters, microstructure, the valence state of the europium ion (at 300 K), electrical resistivity, and differential thermopower (6–400 K) of samples in the Eu(Cu1 − xAgx)2Si2 (0 ≤ x ≤ 1) substitutional solid solutions. A transition of the europium ion from the valence-stable state of Eu2+ in EuAg2Si2 to the state of intermediate (homogeneous) valence (IV) of the europium ion in EuCu2Si2 with an effective valence ϑeff = 2.41 (300 K) has been initiated by a successive replacement of silver atoms by copper atoms. With appropriate sample compositions, the transition passes through a Kondo-type state. The research subject is the patterns of transformations (when the composition of the sample changes), the electronic state, and, accordingly, the electronic transport properties. The simultaneous coexistence of europium ions in different electronic states is assumed. The substitutional solid solution Eu(Cu1 − xAgx)2Si2 (0 ≤ x ≤ 1) exhibits properties related to the competition between the state of the Kondo system, intermediate valence (IV), and magnetic ordering.

show abstract

Correlation between transport properties and valence instability states of Eu ions in Lu Eu1−Cu2Si2

Cited by 2 publications

References 10 publications

Contribution of unstable valence states of europium to the electronic transport properties of EuPd2-xSi2+x

Contribution of unstable valence states of europium to the electronic transport properties of EuPd2-xSi2+x

Electron Transport Properties of Eu(Cu1 − xAgx)2Si2 (0 ≤ x ≤ 1): Initiation of Transition Eu2+ ↔ Eu2.41+ in the Intermediate Valence State

Contact Info

Product

Resources

About