Low-energy optical phonon modes in the caged compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>LaRu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Zn</mml:mi><mml:mn>20</mml:mn></mml:msub></mml:mrow></mml:math>

Wakiya, Kazuhei; Onimaru, Takahiro; Tsutsui, Satoshi; Hasegawa, Tetsuya; Matsumoto, Keisuke; Nagasawa, Naohiro; Baron, Alfred Q. R.; Ogita, Norio; Udagawa, Masayuki; Takabatake, Toshiro

doi:10.1103/physrevb.93.064105

Cited by 35 publications

(20 citation statements)

References 42 publications

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“…However, for LaRu 2 Zn 20 it was recently reported that the Zn ions at the 16c site exhibit low energy, localized vibration modes (rattling). [25] This is indicative of "loose" Zn ions at this site due to the presence of extra space and consequently broadened Madelung potentials. If so, the larger Cd atoms may be expected to occupy this site preferentially, and the small decrease in the value of Θ D is due to the greater atomic mass of Cd.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Tuning the electronic hybridization in the heavy fermion cage compound YbFe₂Zn₂₀with Cd doping

Cabrera-Baez

Ribeiro

Ávila

2016

J. Phys.: Condens. Matter

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Abstract.Tuning of the electronic properties of heavy fermion compounds by chemical substitutions provides excellent opportunities to further understand the physics of hybridized ions in crystal lattices. Here we present an investigation on the effects of Cd doping in flux-grown single crystals of the complex intermetallic cage compound YbFe 2 Zn 20 , that has been described as a heavy fermion with Sommerfeld coefficient of 535 mJ/mol.K 2 . Substitution of Cd for Zn disturbs the system by expanding the unit cell and, in this case, the size of the Zn cages that surround Yb and Fe. With increasing amount of Cd, the hybridization between Yb 4f electrons and the conduction electrons is weakened, as evidenced by a decrease in the Sommerfeld coefficient, which should be accompanied by a valence shift of the Yb 3+ due to the negative chemical pressure effect. This scenario is also supported by the low temperature dc-magnetic susceptibility, that is gradually suppressed and evidences an increment of the Kondo temperature, based on a shift to higher temperatures of the characteristic broad susceptibility peak. Furthermore, the DC resistivity decreases with the isoelectronic Cd substitution for Zn, contrary to the expectation for an increasingly disordered system, and implying that the valence shift is not related to charge carrier doping. The combined results demonstrate excellent complementarity between positive physical pressure and negative chemical pressure, and point to a rich playground for exploring the physics and chemistry of strongly correlated electron systems in the general family of Zn 20 compounds, despite their structural complexity.

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Section: Analysis and Discussionmentioning

confidence: 99%

Tuning the electronic hybridization in the heavy fermion cage compound YbFe₂Zn₂₀with Cd doping

Cabrera-Baez

Ribeiro

Ávila

2016

J. Phys.: Condens. Matter

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“…The equivalent isotropic atomic displacement parameters of B eq of Al(16c) are characterized by one and half times larger than those of other atoms, which was observed in other RTr 2 X 20 compounds for X = Al [20,21] and X = Zn [22,23]. Note that RTr 2 X 20 compounds feature a cage structure that Al(16c) is located in the cage composed of two Yb(8a) atoms and twelve Al(96g) atoms.…”

Section: Resultsmentioning

confidence: 66%

Crystal Structure and Magnetic Properties for Single Crystal of YbTr₂Al₂₀ (Tr = Mo and Ta)

Nakamura

Higashinaka

Aoki

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

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The structural and magnetic properties of new cubic Yb-based compounds YbTr 2 Al 20 (Tr = Mo and Ta) synthesized by Al-self flux method were investigated. The lattice parameter of both compounds is larger than those expected from the lanthanoid contraction. The magnetic susceptibility χ(T) shows weakly-temperature dependent Pauli paramagnetic behavior. These results indicate that the valence of Yb ion is close to the divalent state.

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“…The (red) solid curves are the fits to the C(T ) data for 50 < T < 300 K by adopting the Debye model for acoustic phonon modes [34] with the Debye temperatures of θ D = 312(1) K for R = Pr and 317(1) K for R = Nd. The values of θ D are higher than that of θ D = 259 K for an isostructural LaRu 2 Zn 20 [35], which is reasonable because the molecular weights of RNi 2 Mg 20 for R = Pr and Nd are much lighter than that of LaRu 2 Zn 20 . The insets display the C/T 3 plots with the logarithmical scale.…”

Section: Specific Heat and Magnetic Entropymentioning

confidence: 69%

Synthesis and study of transport and magnetic properties of magnesium cage compounds $R$Ni$_{2}$Mg$_{20}$ ($R$ = Pr and Nd)

Kusanose¹,

Onimaru²,

Yu³

et al. 2021

Preprint

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We have synthesized magnesium cage compounds RNi 2 Mg 20 (R = Pr and Nd). We report the measurements of electrical resistivity ρ, magnetic susceptibility χ, isothermal magnetization M, and specific heat C. Polycrystalline samples with R = Pr and Nd were obtained by annealing, while the counterparts for R = La, Ce, and Y were found to be absent. The ρ(T ) data for R = Pr and Nd monotonically decrease on cooling from 300 K to 40 K and exhibit shoulders at around 13 K and 15 K, respectively. The Curie-Weiss behaviors of the χ(T ) data indicate the trivalent states of both the Pr and Nd ions. For R = Pr, the maximum in C(T ) at around 7 K is reproduced by a doublet-triplet two-level model with an energy gap of 14 K. The peak in C(T ) at 0.7 K is attributed to a short-range order of quadrupolar degrees of freedom in the non-Kramers ground doublet. On the other hand, for R = Nd, a maximum in C(T ) at around 9 K is explained by thermal excitation from a ground state doublet to an excited quartet separated by 23 K. Upon further cooling, C(T ) shows a lambda-shaped peak at 1.5 K. By applying magnetic fields up to 2 T, the peak becomes broad and shifts to higher temperatures, which is a characteristic of a ferromagnetic order.

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Low-energy optical phonon modes in the caged compoundLaRu2Zn20

Abstract: The caged compound LaRu 2 Zn 20 exhibits a structural transition at T S =150 K, whose driving mechanism remains elusive. We have investigated atomic dynamics by the measurements of specific heat C and inelastic X-ray scattering (IXS). The lattice part of the specific heat C lat divided by

Cited by 35 publications

References 42 publications

Tuning the electronic hybridization in the heavy fermion cage compound YbFe₂Zn₂₀with Cd doping

Tuning the electronic hybridization in the heavy fermion cage compound YbFe₂Zn₂₀with Cd doping

Crystal Structure and Magnetic Properties for Single Crystal of YbTr₂Al₂₀ (Tr = Mo and Ta)

Synthesis and study of transport and magnetic properties of magnesium cage compounds $R$Ni$_{2}$Mg$_{20}$ ($R$ = Pr and Nd)

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Low-energy optical phonon modes in the caged compoundLaRu2Zn20

Abstract: The caged compound LaRu 2 Zn 20 exhibits a structural transition at T S =150 K, whose driving mechanism remains elusive. We have investigated atomic dynamics by the measurements of specific heat C and inelastic X-ray scattering (IXS). The lattice part of the specific heat C lat divided by

Cited by 35 publications

References 42 publications

Tuning the electronic hybridization in the heavy fermion cage compound YbFe2Zn20with Cd doping

Tuning the electronic hybridization in the heavy fermion cage compound YbFe2Zn20with Cd doping

Crystal Structure and Magnetic Properties for Single Crystal of YbTr2Al20 (Tr = Mo and Ta)

Synthesis and study of transport and magnetic properties of magnesium cage compounds $R$Ni$_{2}$Mg$_{20}$ ($R$ = Pr and Nd)

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Product

Resources

About

Tuning the electronic hybridization in the heavy fermion cage compound YbFe₂Zn₂₀with Cd doping

Tuning the electronic hybridization in the heavy fermion cage compound YbFe₂Zn₂₀with Cd doping

Crystal Structure and Magnetic Properties for Single Crystal of YbTr₂Al₂₀ (Tr = Mo and Ta)