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Journal Articles

Anisotropy of spin fluctuations in a tetragonal heavy fermion antiferromagnet CeRhAl$$_4$$Si$$_2$$

Sakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Ghimire, N. J.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

Journal of Physics; Conference Series, 868(1), p.012012_1 - 012012_5, 2017/07

https://doi.org/10.1088/1742-6596/868/1/012012
 Times Cited Count：1 Percentile：49.63(Physics, Applied)

$$^{27}$$Al NMR experiments have been performed using a single crystal of CeRhAl$$_4$$Si$$_2$$. In the paramagnetic state, Knight shifts, quadrupolar frequency, and asymmetric parameter of electrical field gradient on the Al sites have been determined, which has a local orthorhombic symmetry. The transferred hyperfine coupling constants are also determined. The relaxation rates suggest that 4$$f$$ electrons behave as local moments in the high temperatures. From the NMR spectral analyses, the antiferromagnetic structures are discussed.

Journal Articles

Incommensurate to commensurate antiferromagnetism in CeRhAl$$_4$$Si$$_2$$; An $$^{27}$$Al NMR study

Sakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Ghimire, N. J.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

Physical Review B, 93(1), p.014402_1 - 014402_9, 2016/01

https://doi.org/10.1103/PhysRevB.93.014402
 Times Cited Count：2 Percentile：10.64(Materials Science, Multidisciplinary)

$$^{27}$$Al nuclear magnetic resonance (NMR) experiments have been performed on a single crystal of CeRhAl$$_4$$Si$$_2$$, which is an antiferromagnetic Kondo-lattice compound with successive antiferromagnetic transitions of $$T_{rm N1}$$=14 K and $$T_{rm N2}$$=9 K at zero external field. In the paramagnetic state, the Knight shifts, quadrupolar frequency, and asymmetric parameter of electrical field gradient on the Al sites have been determined, which have local orthorhombic symmetry. The transferred hyperfine coupling constants are also determined. Analysis of the NMR spectra indicates that a commensurate antiferromagnetic structure exists below $$T_{rm N2}$$, but an incommensurate modulation of antiferromagnetic moments is present in the antiferromagnetic state between $$T_{rm N1}$$ and $$T_{rm N2}$$. The spin-lattice relaxation rate suggests that the $$4f$$ electrons behave as local moments at temperatures above $$T_{rm N1}$$.

Oral presentation

Incommensurate-commensurate antiferromagnetic orders in Kondo lattice compound CeRhAl$$_4$$Si$$_2$$

Sakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Ghimire, N. J.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

no journal, , 

Antiferromagnetic Kondo lattice system CeRhAl$$_4$$Si$$_2$$ exhibits successive antiferromagnetic transitions at $$T_{N1}$$=14 K and $$T_{N2}$$=9 K under zero field. Neutron diffraction experiments reveal the commensurate antiferromagnetism below $$T_{N2}$$ and incommensurate SDW state below $$T_{N1}$$ above $$T_{N2}$$. In this study, we have performed $$^{27}$$Al NMR measurements using the single crystal of CeRhAl$$_4$$Si$$_2$$. In the paramagnetic state, from the NMR spectral analyses, Knight shifts and electric field gradient on the Al sites have been determined, as well as the anisotropy of hyperfine coupling constants. Based on the nuclear spin -lattice relaxation rates, the Kondo energy scale is found to be close to the energy scale of RKKY interaction, which is consistent with the result by specific heat measurement.

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