2024/10/17 by T. Kubo, Kubo, Tetsuro, Hiroshi Yaśuoka +9
Materials Science · Physics and Astronomy · #Boron and Carbon Nanomaterials Research #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Metallurgical and Alloy Processes #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.2410.13525
openalex publication_date 2024/10/17 · openalex created_date 2024/10/21 · openalex updated_date 2026/07/28
Nuclear magnetic resonance (NMR) techniques have been used to study the static and dynamic microscopic properties of the Weyl semimetal NbP. From a complete analysis of the angular dependence of the 93Nb-NMR spectra in a single crystal, the parameters for the electric quadrupole interactions and the magnetic hyperfine interactions were determined to be ν\rm Q = 0.61 MHz, η= 0.20, (KXX, KYY, KZZ) = (- 0.06, 0.11, - 0.11)% at 4.5 K. The temperature and field dependence of the 93Nb Knight shift revealed a characteristic feature of the shape of the density of states with nearly massless fermions. We clearly observed a quantum oscillation of the Knight shift associated with the band structure, whose frequency was in good agreement with the previous bulk measurements. The temperature dependence of the spin-lattice relaxation rate, 1 / T1 T, showed an almost constant behavior for 30 < T < 180 K, while a weak temperature dependence was observed below ∼ 30 K. This contrasts with the behavior observed in TaP and TaAs, where the 1 / T1 T measured by the 181Ta nuclear quadrupole resonance (NQR) shows 1 / T1 T ∝ T2 and T4 above approximately 30 K. In TaP, the temperature dependent orbital hyperfine interaction plays a signficant role in nuclear relaxation, whereas this contribution is not observed in TaAs. Two-component spin echo oscillations were observed. The shorter-period oscillation is attributed to the origin of quadrupole coupling, while the longer-period oscillation indicates the presence of indirect nuclear spin-spin coupling, as discussed in other Weyl semimetal like TaP.