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Collinear ferromagnetism with reduced moment length in kagome magnet Nd 3 ⁢Ru 4 ⁢Al 12

Ishihara, Yuki [Univ. of Tokyo (Japan)]·Nakano, Ryota [Univ. of Tokyo (Japan)]·Yamada, Rinsuke [Univ. of Tokyo (Japan)]·Nomoto, Takuya [Tokyo Metropolitan University (Japan)]·Baral, Priya R. [Univ. of Tokyo (Japan)] (ORCID:0000000297556165)·Hirschmann, Moritz M. [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)] (ORCID:0000000306104612)·Gautam, Kamini [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)] (ORCID:0000000224896441)·Kolincio, Kamil K. [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); Gdańsk Univ. of Technology (Poland)] (ORCID:0000000297576764)·Kikkawa, Akiko [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)]·Aji, Seno [Univ. of Tokyo (Japan); Univ. of Indonesia (Indonesia)] (ORCID:0000000270458741)·Saitoh, Hiraku [Univ. of Tokyo (Japan)] (ORCID:0009000466570863)·Matsuda, Masaaki [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000322099526)·Taguchi, Yasujiro [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)] (ORCID:000000031896699X)·Arima, Taka-hisa [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); Univ. of Tokyo (Japan)] (ORCID:0000000269590454)·Tokura, Yoshinori [Univ. of Tokyo (Japan); RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); Univ. of Tokyo (Japan)]·Nakajima, Taro [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); Univ. of Tokyo (Japan); High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)]·Hirschberger, Max [Univ. of Tokyo (Japan); RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)] (ORCID:0000000217801619)
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Abstract

Here, we determine the magnetic ground state of the kagome lattice magnet Nd 3 ⁢Ru 4⁢ Al 12 by single-crystal neutron diffraction, supported by experiments with polarized neutrons. We identify this material as a collinear ferromagnet (“hex-FM”) with uniform moment length and ordering vector 𝑸 = 0, in contrast to a previous, seminal report that proposed unequal moment lengths on two Nd sites, here called the “ortho-FM” state. Our analysis of the flipping ratio in polarized neutron scattering is consistent with the hex-FM state. The results provide a microscopic basis for understanding the large fluctuation-induced Hall and Nernst responses near 𝑇 C ≈ 41K, as previously reported for Nd 3 ⁢Ru 4 ⁢Al 12 .

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RKKY interactionferromagnetisimkagome latticekagome metalmagnetic ordermagnetismneutron diffractionneutron scatteringrare-earth alloys

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Ishihara, Yuki [Univ. of Tokyo (Japan)], Nakano, Ryota [Univ. of Tokyo (Japan)], Yamada, Rinsuke [Univ. of Tokyo (Japan)], Nomoto, Takuya [Tokyo Metropolitan University (Japan)], Baral, Priya R. [Univ. of Tokyo (Japan)] (ORCID:0000000297556165), Hirschmann, Moritz M. [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)] (ORCID:0000000306104612), Gautam, Kamini [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)] (ORCID:0000000224896441), Kolincio, Kamil K. [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); Gdańsk Univ. of Technology (Poland)] (ORCID:0000000297576764), Kikkawa, Akiko [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)], Aji, Seno [Univ. of Tokyo (Japan); Univ. of Indonesia (Indonesia)] (ORCID:0000000270458741), Saitoh, Hiraku [Univ. of Tokyo (Japan)] (ORCID:0009000466570863), Matsuda, Masaaki [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000322099526), Taguchi, Yasujiro [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)] (ORCID:000000031896699X), Arima, Taka-hisa [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); Univ. of Tokyo (Japan)] (ORCID:0000000269590454), Tokura, Yoshinori [Univ. of Tokyo (Japan); RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); Univ. of Tokyo (Japan)], Nakajima, Taro [RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); Univ. of Tokyo (Japan); High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)], Hirschberger, Max [Univ. of Tokyo (Japan); RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)] (ORCID:0000000217801619). 2026-06-02. Collinear ferromagnetism with reduced moment length in kagome magnet Nd 3 ⁢Ru 4 ⁢Al 12. https://doi.org/10.1103/9pvl-33xc

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Coexistence of commensurate and incommensurate antiferromagnetic ground states in Co 𝑥 ⁢NbSe 2 single crystal

In Co 𝑥 ⁢NbSe 2 , crystal symmetry and cobalt site occupation drive the formation of two distinct magnetic phases. At 𝑥=1/4, the centrosymmetric structure (𝑃⁢6 3 /𝑚⁢𝑚⁢𝑐) promotes Co-Co interactions leading to the formation of an 𝐴-type antiferromagnetic structure phase with a transition temperature of 𝑇$^𝐴_𝑁$=169K. At 𝑥=1/3, the noncentrosymmetric structure (𝑃⁢6 3 ⁢22) induces a lower-temperature magnetic phase with 𝑇$^S_𝑁$=28K. We report the coexistence of both substructures within a superlattice, with a nuclear propagation vector of (1/3, 1/3, 0) relative to the host lattice. Single crystals of Co 0.28 ⁢NbSe 2 exhibit both magnetic transitions, with 𝑇$^𝐴_𝑁$ corresponding to the 𝑥∼1/4 phase and 𝑇$^S_𝑁$ corresponding to the 𝑥∼1/3 phase. Magnetic susceptibility and specific heat measurements confirm these transitions, although only the high-temperature 𝑇$^𝐴_𝑁$ phase significantly affects resistivity. We successfully isolate each phase in powder samples, while single crystals with an intercalation ratio of 𝑥=0.28 display the coexistence of both phases in a single sample. Using single-crystal neutron diffraction, we solved the magnetic structure of the high-temperature centrosymmetric phase (𝑇$^𝐴_𝑁$), and neutron powder diffraction revealed the double-𝑞 magnetic structure of the low-temperature noncentrosymmetric phase (𝑇$^S_𝑁$).

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