Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 7: Poster Magnetism I

MA 7.6: Poster

Montag, 9. März 2026, 09:30–12:30, P2

Rare-earth substitution tuning of a proximate quantum spin-ice pyrochlore — •Yinghao Zhu, Jonathan Gustavo Acosta Ramon, and Yixi Su — JCNS-MLZ, Forschungszentrum Jülich GmbH, Garching, Germany

Pyrochlore-structure frustrated magnets with the general formula R2B2O7 (where R represents magnetic 4f rare-earth ions and B is a non-magnetic cation) consist of a three-dimensional network of corner-sharing tetrahedra. This 3D geometry gives rise to a richer landscape of magnetic interactions and spin configurations compared to their 2D counterparts, such as triangular or kagome latices. The nature of the magnetic anisotropy depends on the specific rare-earth ion: for instance, in Nd2Zr2O7, the Nd3+ ions exhibit local (111) Ising anisotropy, leading to an all-in-all-out antiferromagnetic ground state. In contrast, Yb2Ti2O7 hosts XY-like spins with moments confined to planes perpendicular to the local (111) axes. In this work, we introduce partial substitution of Nd3+ into Yb2Ti2O7, aiming to perturb the pure XY anisotropy of Yb3+ with Ising-like contributions from Nd3+. This allows us to explore the interplay between different types of magnetic anisotropy within the geometrically frustrated pyrochlore framework. Building on the high-quality single crystal obtained, future neutron scattering studies on YbNdTi2O7 are expected to provide valuable insights into the anisotropic spin correlations and potential emergent quantum phenomena arising from the interplay of Ising and XY interactions.

Keywords: pyrochlores; spin ice; rare-earth substitution; magnetic frustration