Real Space Imaging of Spin Polarons in Zn-Doped SrCu2(BO3)2

M. Yoshida , H. Kobayashi , I. Yamauchi (1) , M. Takigawa (1) , Sylvain Capponi (2, 3) , Didier Poilblanc (2, 3) , Frédéric Mila (4) , K. Kudo (5) , Y. Koike , N. Kobayashi

1 ISSP - Institute for Solid State Physics [Tokyo]
2 FFC - Fermions Fortement Corrélés (LPT)
3 LPT - Laboratoire de Physique Théorique
4 UNIL - Université de Lausanne = University of Lausanne
5 Equipe Perception et cognition musicales

We report on the real space profile of spin polarons in the quasi two-dimensional frustrated dimer spin system SrCu2(BO3)2 doped with 0.16% of Zn. The 11B nuclear magnetic resonance spectrum exhibits 15 additional boron sites near non-magnetic Zn impurities. With the help of exact diagonalizations of finite clusters, we have deduced from the boron spectrum the distribution of local magnetizations at the Cu sites with fine spatial resolution, providing direct evidence for an extended spin polaron. The results are confronted with those of other experiments performed on doped and undoped samples of SrCu2(BO3)2.

Domaines: Autre [cond-mat.other]

M. Yoshida, H. Kobayashi, I. Yamauchi, M. Takigawa, Sylvain Capponi, et al.. Real Space Imaging of Spin Polarons in Zn-Doped SrCu2(BO3)2. Physical Review Letters, 2015, 114 (5), pp.056402. ⟨10.1103/PhysRevLett.114.056402⟩. ⟨hal-01053695⟩