Robust noncoplanar magnetism in band filling-tuned (Nd${}_{1-x}$Ca${}_x$)${}_2$Mo${}_2$O${}_7$

Abstract

In the metallic pyrochlore Nd${}_2$Mo${}_2$O${}_7$, the conducting Molybdenum sublattice adopts canted, yet nearly collinear ferromagnetic order with nonzero scalar spin chirality. The chemical potential may be controlled by replacing Nd${}^{3+}$ with Ca${}^{2+}$, while introducing only minimal additional disorder to the conducting states. Here, we demonstrate the stability of the canted ferromagnetic state, including the tilting angle of Molybdenum spins, in (Nd${}_{1-x}$Ca${}_x$)${}_2$Mo${}_2$O${}_7$ (NCMO) with $x\le 0.15$ using magnetic susceptibility measurements. Mo-Mo and Mo-Nd magnetic couplings both change sign above $x=0.22$, where the canted ferromagnetic state gives way to a spin-glass metallic region. Contributions to the Curie-Weiss law from two magnetic sublattices are separated systematically.

22 pages, 9 figures

References in corpus (7)

• Nanometric square skyrmion lattice in a centrosymmetric tetragonal magnet
• Giant generic topological Hall resistivity of MnSi under pressure
• Real space Berry curvature of itinerant electron systems with spin-orbit interaction
• Phase competition in the double-exchange model on the frustrated pyrochlore lattice
• Studies of the Anomalous Hall Effect and Magnetic Structure of Nd2Mo2O7 -Test of the Chirality Mechanism-
• Floating zone furnace equipped with a high power laser of 1kW composed of five smart beams
• Geometrical Hall effect and momentum-space Berry curvature from spin-reversed band pairs

Cited by in corpus (1)

• Metal-insulator transitions in pyrochlore oxides