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Open Access Publications from the University of California

The nature of ferromagnetism in the chiral helimagnet Cr1/3NbS2

  • Author(s): Sirica, N
  • Vilmercati, P
  • Bondino, F
  • Pis, I
  • Nappini, S
  • Mo, SK
  • Fedorov, AV
  • Das, PK
  • Vobornik, I
  • Fujii, J
  • Li, L
  • Sapkota, D
  • Parker, DS
  • Mandrus, DG
  • Mannella, N
  • et al.

The chiral helimagnet Cr NbS hosts exotic spin textures, whose influence on the magneto-transport properties make this material an ideal candidate for future spintronic applications. To date, the interplay between macroscopic magnetic and transport degrees of freedom is believed to result from a reduction in carrier scattering following spin order. Here, we present electronic structure measurements across the helimagnetic transition temperature T that challenges this view. We show that the Fermi surface is comprised of strongly hybridized Nb- and Cr-derived electronic states, and that spectral weight close to the Fermi level increases anomalously as the temperature is lowered below T . These findings are rationalized on the basis of first principle density functional theory calculations, which reveal a large nearest-neighbor exchange energy, suggesting the interaction between local spin moments and hybridized Nb- and Cr-derived itinerant states to go beyond the perturbative interaction of Ruderman-Kittel-Kasuya-Yosida, suggesting instead a mechanism rooted in a Hund’s exchange interaction. 1/3 2 C C

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