Ultrasonic observation of small Fermi surfaces in LaTIn5 (T = Co, Rh, Ir)

Ryosuke Kurihara; Yusuke Hirose; Kazuki Matsui; Atsushi Miyake; Ryoma Tsunoda; Masaki Kondo; Rikio Settai; Mitsuhiro Akatsu; Yuichi Nemoto; Hiroshi Yaguchi; Masashi Tokunaga

doi:10.56646/jjapcp.12.0_011006

Quest for the non-perturbative magnetic field effects in the 1000-Tesla magnetic field region

Session ID : 011006

DOI https://doi.org/10.56646/jjapcp.12.0_011006

Conference information

Host: Grant-in-Aid for Transformative Research Areas (A) 23A201, 1000-Tesla Science

Name : 1000-Tesla Science Workshop: Quest For The Non-Perturbative Magnetic Field Effects In The 1000-Tesla Magnetic Field Region

Location : Kashiwa Library, University of Tokyo

Date : December 05, 2025 - December 09, 2025

Ultrasonic observation of small Fermi surfaces in LaTIn₅ (T = Co, Rh, Ir)

Ryosuke Kurihara, Yusuke Hirose, Kazuki Matsui, Atsushi Miyake, Ryoma Tsunoda, Masaki Kondo, Rikio Settai, Mitsuhiro Akatsu, Yuichi Nemoto, Hiroshi Yaguchi, Masashi Tokunaga

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CONFERENCE PROCEEDINGS OPEN ACCESS

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Abstract

We performed high-field ultrasonic measurements on LaTIn₅ (T = Co, Rh, Ir) to reveal the origin of the small Fermi surface that was recently observed in LaRhIn₅ with an oscillation frequency of 6.8 T. We observed quantum oscillations originating from this Fermi surface in LaRhIn₅. In addition, we revealed that LaCoIn₅ and LaIrIn₅ exhibit quantum oscillations with frequencies below 100 T, indicating hidden Fermi surfaces in these compounds. Furthermore, Co-substituted LaRhIn₅ exhibited quantum oscillations with a frequency of 10 T. Our results suggest that the small Fermi surface originates from bulk properties and that 3d electrons of the transition metal contribute to its formation.

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