Fragility of ferromagnetic double exchange interactions and pressure tuning of magnetism in 3d-5d double perovskite Sr2FeOsO6

Author(s)

Veiga, L. S. I. ; Fabbris, G. ; van Veenendaal, M. ; Souza-Neto, N. M. ; Feng, H. L. ; Yamaura, K. ; Haskel, D.

• Document type: Journal article
• Source: PHYSICAL REVIEW B; v. 91, n. 23, p. 7-pg., 2015-06-19.

Abstract

The ability to tune exchange (magnetic) interactions between 3d transition metals in perovskite structures has proven to be a powerful route to discovery of novel properties. Here we demonstrate that the introduction of 3d-5d exchange pathways in double perovskites enables additional tunability, a result of the large spatial extent of 5d wave functions. Using x-ray probes of magnetism and structure at high pressure, we show that compression of Sr2FeOsO6 drives an unexpected continuous change in the sign of Fe-Os exchange interactions and a transition from antiferromagnetic to ferrimagnetic order. We analyze the relevant electron-electron interactions, shedding light into fundamental differences with the more thoroughly studied 3d-3d systems. (AU)

• FAPESP's process: 13/14338-3 - Interplay between superconductivity and magnetism in systems under pressure and thin films
• Grantee: Larissa Sayuri Ishibe Veiga
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate