Elastic moduli of the distorted Kagome-lattice ferromagnet Nd3Ru4Al12

Suzuki, Takashi; Mizuno, Toshiyuki; Takezawa, Kohki; Kamikawa, Shuhei; Андреев, А.В.; Gorbunov, D. I.; Henriques, M. S.; Ishii, Isao

doi:10.1016/j.physb.2017.10.008

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…In addition, an upturn (a small irregularity in Ref. 19) was also detected at about 10 K in the temperature dependence of the longitudinal modulus C 33 . No anomaly was detected around 10 K in any other physical properties measured, such as the specific heat and magnetic susceptibility, indicating that the upturn is not caused by any structural or magnetic phase transition [8].…”

Section: Introductionmentioning

confidence: 68%

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Ultrasonic Dispersion in the Hexagonal Ferromagnet Nd₃Ru₄Al₁₂

Suzuki

Mizuno

Kumano

et al. 2020

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

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The rare-earth ferromagnet Nd 3 Ru 4 Al 12 has Curie temperature T C = 39 K and crystallizes in the hexagonal Gd 3 Ru 4 Al 12-type structure (space group P6 3 /mmc), which is a non-caged structure. A previous measurement of the elastic moduli has shown an upturn around 10 K in the temperature dependence of the longitudinal modulus C 33. The upturn is not caused by any phase transition. To investigate the origin of the upturn in Nd 3 Ru 4 Al 12 , we have measured the temperature dependence of C 33 at various ultrasonic frequencies. The temperature of the upturn increases with increasing ultrasonic frequency indicating the ultrasonic dispersion, and it does not change under applied magnetic fields. These results suggest that the upturn originates from the rattling effect at one of the aluminium sites in the crystal structure. Assuming a Debye-type relaxation for the elastic modulus and an Arrhenius-type relaxation time for the rattling, the activation energy was estimated as E = 115 K and the relaxation time as  0 = 1.5  10-13 s.

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Section: Introductionmentioning

confidence: 68%

“…The elastic moduli of Nd 3 Ru 4 Al 12 were previously measured and elastic anomalies were found around T C [19]. In addition, an upturn (a small irregularity in Ref.…”

Section: Introductionmentioning

confidence: 90%

Ultrasonic Dispersion in the Hexagonal Ferromagnet Nd₃Ru₄Al₁₂

Suzuki

Mizuno

Kumano

et al. 2020

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

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“…It was reported that the origin of reduced magnetic moments is likely owing to the CEF effect and competing exchange and anisotropy interactions, however, the CEF effect is unclear at present [4]. On the other hand, we previously measured the elastic moduli by using ultrasonic technique and reported that there is no characteristic softening arising from the CEF effect in Nd [12][13][14]17]. This indicates that a coupling constant of a quadrupole interaction between strains and corresponding quadrupoles is relatively small in this compound.…”

Section: Introductionmentioning

confidence: 76%

The Crystal Electric Field Effect in the Distorted Kagome Lattice Ferromagnet Nd₃Ru₄Al₁₂

Ishii

Mizuno

Kumano

et al. 2020

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

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The distorted kagome lattice compound Nd 3 Ru 4 Al 12 shows a ferromagnetic phase transition at T C = 39 K. Reduced Nd magnetic moments with two different values of 2.66 and 0.95 µ B are aligned along the c-axis below T C. It was previously reported that a crystal electric field (CEF) effect may affect the reduced magnetic moments. To clarify the 4 f-electronic state in Nd 3 Ru 4 Al 12 , we performed CEF analyses for the inverse magnetic susceptibility and magnetization. We proposed the CEF level scheme of which the inverse magnetic susceptibilities along both a-and c-axes are reproduced. The ferromagnetic phase transition at T C along the c-axis can be explained by a simple CEF model. In contrast, reduced magnetic moments cannot be understood by the simple CEF model, because calculated magnetization curves are quite larger than the experimental data.

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“…The R-Al and Ru-Al layers are stacked along [001] alternately. This series has been primarily studied in terms of magnetism, for instance, an antiferromagnetic and a field-induced quadrupolar orderings in Dy 3 Ru 4 Al 12 and a helical ordering of spin trimers in Gd 3 Ru 4 Al 12 [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Magnetic transition due to the inter-singlet spin-exchange interaction and elastic softening by the interplay of electric quadrupoles in the distorted kagome lattice antiferromagnet Tb3Ru4Al12

et al. 2020

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The distorted kagome lattice antiferromagnet Tb 3 Ru 4 Al 12 with a hexagonal structure has the Néel temperature T N = 22 K. To clarify the 4 f -electronic state and an influence of electric quadrupoles in Tb 3 Ru 4 Al 12 , ultrasonic measurements on a single-crystalline sample at zero magnetic field and under fields were carried. A characteristic elastic softening of the transverse modulus C 66 originating from a quadrupole interaction was found. The crystal electric field parameters were determined to reproduce C 66 , magnetic susceptibilities, and magnetization curves. The obtained level scheme is that the ground and first excited states are singlets, despite the existence of both the magnetic transition and the quadrupole interaction, indicating that Tb 3 Ru 4 Al 12 is a curious compound. The positive sign of the quadrupole-quadrupole coupling constant for C 66 indicates a ferroquadrupolar-type interaction of the electric quadrupole O xy or O 2 2 . The anisotropic magnetic field dependencies of T N in the field along [100] and [001] were also clarified.

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Elastic moduli of the distorted Kagome-lattice ferromagnet Nd3Ru4Al12

Cited by 7 publications

References 8 publications

Ultrasonic Dispersion in the Hexagonal Ferromagnet Nd₃Ru₄Al₁₂

Ultrasonic Dispersion in the Hexagonal Ferromagnet Nd₃Ru₄Al₁₂

The Crystal Electric Field Effect in the Distorted Kagome Lattice Ferromagnet Nd₃Ru₄Al₁₂

Magnetic transition due to the inter-singlet spin-exchange interaction and elastic softening by the interplay of electric quadrupoles in the distorted kagome lattice antiferromagnet Tb3Ru4Al12

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Elastic moduli of the distorted Kagome-lattice ferromagnet Nd3Ru4Al12

Cited by 7 publications

References 8 publications

Ultrasonic Dispersion in the Hexagonal Ferromagnet Nd3Ru4Al12

Ultrasonic Dispersion in the Hexagonal Ferromagnet Nd3Ru4Al12

The Crystal Electric Field Effect in the Distorted Kagome Lattice Ferromagnet Nd3Ru4Al12

Magnetic transition due to the inter-singlet spin-exchange interaction and elastic softening by the interplay of electric quadrupoles in the distorted kagome lattice antiferromagnet Tb3Ru4Al12

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Product

Resources

About

Ultrasonic Dispersion in the Hexagonal Ferromagnet Nd₃Ru₄Al₁₂

Ultrasonic Dispersion in the Hexagonal Ferromagnet Nd₃Ru₄Al₁₂

The Crystal Electric Field Effect in the Distorted Kagome Lattice Ferromagnet Nd₃Ru₄Al₁₂