Impurity-induced spin pseudogap in SrCuO2 doped with Mg, Zn, or La

Dec 21, 2017

Impurity-induced spin pseudogap in SrCuO2 doped with Mg, Zn, or La

Crystal structure of SrCuO2

D. Bounoua, R. Saint-Martin, S. Petit, P. Berthet, F. Damay, Y. Sidis, F. Bourdarot, and L. Pinsard-Gaudart, Phys. Rev. B 95, 224429

The low energy magnetic excitations spectra of the pristine and doped quasi-one-dimensional spin chains cuprates $SrCu O_{2}$ have been investigated by inelastic neutron scattering. The momentum-integrated magnetic dynamical structure factor yields a constant integrated intensity with regard to energy in the pure compound, while it shows a strong decay, at low energies, in the compounds doped with nonmagnetic impurities, namely, $SrC u_{0.99} M_{0.01} O_{2}$ (with $M = Zn$ or Mg) and $S r_{0.99} L a_{0.01} Cu O_{2}$ ( $C u^{+}$ carrying $S = 0$ created within the chains). These results evidence the opening of a spin pseudogap in the two-spinon continuum of $SrCu O_{2}$ upon doping, stemming from disruptions of the spin chains by quantum impurities.

#2817 - Last update : 12/21 2017

• Physics, chemistry, nanoscience and materials around large instruments › Physique de la matière condensée, étude par l’interaction rayonnement matière Statistical physics and complex systems › Statistical physics and complex systems Physique, chimie, nanosciences et matériaux autour des grands instruments Systèmes complexes et transition énergétique

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