Competing Magnetic Interactions in the Kramers Doublet System NdIr<sub>2</sub>Zn<sub>20</sub>

Yu, You‐Jun; Yamada, R.; Onimaru, Takahiro; Uenishi, K.; Wakiya, Kazuhei; Matsumoto, Keisuke; Umeo, Kazunori; Takabatake, Toshiro

doi:10.7566/jpsj.86.054708

Cited by 13 publications

(7 citation statements)

References 28 publications

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“…Nd-based compounds NdTr 2 X 20 exhibit ferromagnetic or antiferromagnetic transitions below 2 K [17,18,19,20,21,22,23]. The crystalline electric field (CEF) ground states of the Nd ion are mostly the Γ 6 doublets.…”

Section: Introductionmentioning

confidence: 99%

Magnetic structure of an antiferromagnet NdRh₂Zn₂₀ investigated by powder neutron diffraction

R.Yamamoto

Shimura

Umeo

et al. 2022

J. Phys.: Conf. Ser.

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Powder neutron diffraction measurements were carried out to investigate the magnetic structure of the antiferromagnet NdRh2Zn20. The magnetic reflections observed for T ≤ 1.0 K are indexed by the propagation vector of k = (1/2, 1/2, 1/2). From the analysis of the intensity of magnetic reflections, a magnetic structure described by the Γ6 representation is proposed. The magnetic moments are parallel to the [ 11 2 ¯ ] or [ 1 ¯ 10 ] direction and stacked with a sequence of up-up-down-down along the [111] direction.

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Section: Introductionmentioning

confidence: 99%

Magnetic structure of an antiferromagnet NdRh₂Zn₂₀ investigated by powder neutron diffraction

R.Yamamoto

Shimura

Umeo

et al. 2022

J. Phys.: Conf. Ser.

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“…Furthermore, the NFL behaviors in the diluted Pr system Y(Pr)Ir 2 Zn 20 [18,19] indicate manifestation of the quadrupole Kondo effect [20,21]. On the other hand, in isostructural Nd-based compounds NdT 2 X 20 with the 4 f 3 configuration, the crystalline electric field (CEF) ground states are mostly the magnetic Γ 6 doublets [22,23,24,25,26,27]. NdT 2 X 20 exhibit either ferromagnetic (FM) or antiferromagnetic (AFM) transitions.…”

Section: Introductionmentioning

confidence: 99%

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

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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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“…Recently, isostructural Nd-based systems NdTr 2 X 20 with the 4 f 3 configuration have been stud-ied. In most of the systems, the CEF ground states are Kramers Γ 6 doublets, and they exhibit either ferromagnetic or antiferromagnetic transitions [16][17][18][19][20][21]. Among them, NdCo 2 Zn 20 shows an antiferromagnetic order at T N = 0.53 K [22].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of a Diluted Nd System Y₁₋_xNd_xCo₂Zn₂₀ for x = 0.20 with a $\Gamma _{6}$ Doublet Ground State

R.Yamamoto

Onimaru

et al. 2020

Proceedings of J-Physics 2019: International Conference on Multipole Physics and Related Phenomena

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Magnetic susceptibility χ, isothermal magnetization M, and specific heat C of a diluted 4 f 3 system Y 1−x Nd x Co 2 Zn 20 were measured. For x = 0.19, χ(T) in B || [100] = 0.1 T follows the Curie-Weiss law between 50 and 300 K. The effective magnetic moment of 3.95 µ B /Nd and the paramagnetic Curie temperature of −13.4 K, respectively, indicate the trivalent state of the Nd ion and antiferro-type interaction between the Nd magnetic moments. The magnetic specific heat divided by temperature, C m /T , for x = 0.20 shows a broad maximum at 13 K, which can be moderately reproduced by the CEF parameters for NdCo 2 Zn 20 , indicating the Γ 6 doublet ground state. The set of data of M(B) for B || [100], B || [110], and B || [111] are fitted well using the CEF parameters and the ferro-type intersite interaction. No phase transition was observed down to the lowest temperature of 0.068 K. C m /T for B = 0 diverges on cooling for T ≤ 2 K more strongly than −lnT. The maximum in C m /T at B ≥ 2 T is well reproduced by the calculation with the CEF model including the Zeeman effect. The magnetic entropy S m for B = 0 is 0.15Rln2 at T = 0.068 K, indicating the masking of the two-channel Kondo effect by the intersite interaction between the Nd magnetic moments.

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Competing Magnetic Interactions in the Kramers Doublet System NdIr₂Zn₂₀

Cited by 13 publications

References 28 publications

Magnetic structure of an antiferromagnet NdRh₂Zn₂₀ investigated by powder neutron diffraction

Magnetic structure of an antiferromagnet NdRh₂Zn₂₀ investigated by powder neutron diffraction

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

Magnetic Properties of a Diluted Nd System Y₁₋_xNd_xCo₂Zn₂₀ for x = 0.20 with a \(\Gamma _{6}\) Doublet Ground State

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Competing Magnetic Interactions in the Kramers Doublet System NdIr2Zn20

Cited by 13 publications

References 28 publications

Magnetic structure of an antiferromagnet NdRh2Zn20 investigated by powder neutron diffraction

Magnetic structure of an antiferromagnet NdRh2Zn20 investigated by powder neutron diffraction

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

Magnetic Properties of a Diluted Nd System Y1−xNdxCo2Zn20 for x = 0.20 with a \(\Gamma _{6}\) Doublet Ground State

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Competing Magnetic Interactions in the Kramers Doublet System NdIr₂Zn₂₀

Magnetic structure of an antiferromagnet NdRh₂Zn₂₀ investigated by powder neutron diffraction

Magnetic structure of an antiferromagnet NdRh₂Zn₂₀ investigated by powder neutron diffraction

Magnetic Properties of a Diluted Nd System Y₁₋_xNd_xCo₂Zn₂₀ for x = 0.20 with a \(\Gamma _{6}\) Doublet Ground State