Quantum spin fluctuations in the bulk insulating state of pure and Fe-doped SmB6

K. Akintola, A. Pal, M. Potma, S. R. Saha, X. F. Wang, J. Paglione, J. E. Sonier

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The intermediate-valence compound SmB6 is a well-known Kondo insulator, in which the hybridization of itinerant 5d electrons with localized 4f electrons leads to a transition from metallic to insulating behavior at low temperatures. Recent studies suggest that SmB6 is a topological insulator, with topological metallic surface states emerging from a fully insulating hybridized bulk band structure. Here, we locally probe the bulk magnetic properties of pure and 0.5% Fe-doped SmB6 by muon spin rotation/relaxation methods. Below 6 K, the Fe impurity induces simultaneous changes in the bulk local magnetism and the electrical conductivity. In the low-T insulating bulk state we observe a temperature-independent dynamic relaxation rate indicative of low-lying magnetic excitations driven primarily by quantum fluctuations.

Original languageEnglish
Article number245107
JournalPhysical Review B
Issue number24
Publication statusPublished - 06-06-2017

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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