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論文

Multiple metamagnetic transitions in the helical antiferromagnet CeVGe$$_{3}$$

Jin, H.*; Choi, E. S.*; Wu, H.-C.*; Curro, N. J.*; 那波 和宏*; 佐藤 卓*; 鬼柳 亮嗣; 大原 高志; Klavins, P.*; Taufour, V.*

Physical Review B, 111(3), p.035103_1 - 035103_7, 2025/01

https://doi.org/10.1103/PhysRevB.111.035103
 被引用回数：1 パーセンタイル：0.00(Materials Science, Multidisciplinary)

We report on neutron diffraction, magnetoresistance, magnetization and magnetic torque measurements under high magnetic field in the helical antiferromagnet CeVGe$$_{3}$$. This compound exhibits Kondo lattice coherence and helical antiferromagnetic (AFM) ordering at ambient pressure, similar to the well-studied CeRhIn$$_{5}$$. Our measurements reveal that CeVGe$$_{3}$$ undergoes a magnetic transition from an incommensurate (ICM) AFM state to an up-up-down-down commensurate (CM) AFM structure, followed by a transition to a novel phase at higher fields. A quantum phase transition occurs around 21.3 T. This rich magnetic field phase diagram closely resembles that of CeRhIn$$_{5}$$. Furthermore, angle-dependent magnetoresistance measurements reveal that all transitions in CeVGe$$_{3}$$ occur from the field component along the ab plane. These findings highlight the intricate interplay among exchange interactions, crystal field effects, ground state properties, and crystalline symmetries.

論文

$$^{235}$$U nuclear relaxation rates in an itinerant antiferromagnet USb$$_2$$

Baek, S.-H.*; Curro, N. J.*; 酒井 宏典; Bauer, E. D.*; Cooley, J. C.*; Smith, J. L.*

Physical Review B, 81(5), p.054435_1 - 054435_5, 2010/02

https://doi.org/10.1103/PhysRevB.81.054435
 被引用回数：6 パーセンタイル：28.36(Materials Science, Multidisciplinary)

$$^{235}$$U nuclear spin-lattice ($$T_1^{-1}$$) and spin-spin ($$T_2^{-1}$$) relaxation rates in the itinerant antiferromagnet USb$$_2$$ are reported as a function of temperature in zero field. The heating effect from the intense rf pulses that are necessary for the $$^{235}$$U NMR results in unusual complex thermal recovery of the nuclear magnetization which does not allow measuring $$T_1^{-1}$$ directly. By implementing an indirect method, however, we successfully extracted $$T_1^{-1}$$ of the $$^{235}$$U. We find that the temperature dependence of $$T_1^{-1}$$ for both $$^{235}$$U and $$^{121}$$Sb follows the power law ($$propto T^{n}$$) with the small exponent $$n$$ = 0.3 suggesting that the same relaxation mechanism dominates the on-site and the ligand nuclei, but an anomaly at 5 K was observed, possibly due to the change in the transferred hyperfine coupling on the Sb site.

論文

Hybridization-driven gap in U$$_3$$Bi$$_4$$Ni$$_3$$; A $$^{209}$$Bi NMR/NQR study

Baek, S.-H.*; Curro, N. J.*; Klimczuk, T.*; 酒井 宏典; Bauer, E. D.*; Ronning, F.*; Thompson, J. D.*

Physical Review B, 79(19), p.195120_1 - 195120_4, 2009/05

https://doi.org/10.1103/PhysRevB.79.195120
 被引用回数：7 パーセンタイル：31.26(Materials Science, Multidisciplinary)

We report $$^{209}$$Bi nuclear-magnetic-resonance and nuclear-quadrupole-resonance measurements on a single crystal of the Kondo insulator U$$_3$$Bi$$_4$$Ni$$_3$$. The $$^{209}$$Bi nuclear-spin-lattice relaxation rate ($$T_1^1$$) shows activated behavior and is well fit by a spin gap of 220 K. The $$^{209}$$Bi Knight shift ($$K$$) exhibits a strong temperature dependence arising from $$5f$$ electrons, in which $$K$$ is negative at high temperatures and increases as the temperature is lowered. Below 50 K, $$K$$ shows a broad maximum and decreases slightly upon further cooling. Our data provide insight into the evolution of the hyperfine fields in a fully gapped Kondo insulator based on $$5f$$ electron hybridization.

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