Enhancement of charge-neutral fermionic excitations near the spin-flop transition in the magnetic Kondo material YbIr3Si7

Kitagawa, Shunsaku; Kobayashi, Takumi; Hori, Fumiya; Ishida, Kenji; Nevidomskyy, Andriy H.; Qian, Long; Morosan, Emilia

doi:10.1103/physrevb.106.l100405

Enhancement of charge-neutral fermionic excitations near the spin-flop transition in the magnetic Kondo material YbIr3 Si7

Journal Article · Fri Sep 16 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.106.l100405· OSTI ID:1979822

^[1]; Kobayashi, Takumi ^[2]; Hori, Fumiya ^[2]; ^[2]; Nevidomskyy, Andriy H. ^[3]; ^[3]; Morosan, Emilia ^[3]

Kyoto Univ. (Japan); OSTI
Kyoto Univ. (Japan)
Rice Univ., Houston, TX (United States)

The new Kondo material YbIr₃Si₇, similar to other Kondo insulators, has been reported to exhibit charge-neutral fermionic excitations through measurements of specific heat and thermal conductivity at low temperatures. We performed ²⁹Si-NMR on YbIr₃Si₇ to investigate the magnetic response of charge-neutral fermions from a microscopic perspective. In low magnetic fields parallel to the c axis, a single NMR peak in the paramagnetic state splits into three peaks below TN. In contrast, only a slight shift of the single NMR peak was observed in high magnetic fields. This spectral change as a function of the c-axis magnetic field is interpreted as a spin-flop transition, at which the magnetic moments oriented along the c axis antiferromagnetic (AFM-I) phase are rotated to the ab plane with a ferromagnetic component along the c-axis (AFM-II phase). In the vicinity of the spin-flop magnetic field H_M, the nuclear spin-lattice relaxation rate 1/T₁ was found to be proportional to temperature at low temperatures, indicating the existence of charge-neutral fermions. Furthermore, a peak of 1/T₁ versus the c-axis magnetic field suggests that the charge-neutral fermions in YbIr₃Si₇ are closely related to its magnetic properties. Our findings shed light on the origin of charge-neutral fermions in insulators.

View Accepted Manuscript (DOE)

Research Organization:: Rice Univ., Houston, TX (United States); Rice University, Houston, TX (United States)

Sponsoring Organization:: JSPS KAKENHI; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019503

OSTI ID:: 1979822

Alternate ID(s):: OSTI ID: 2281380

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 10 Vol. 106; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Enhancement of charge-neutral fermionic excitations near the spin-flop transition in the magnetic Kondo material YbIr3 Si7

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