Intertwined magnetic sublattices in the double perovskite compound LaSrNiReO6

Artikel i vetenskaplig tidskrift, 2020

We report a muon spin rotation (μ+SR) study of the magnetic properties of the double perovskite compound LaSrNiReO6. Using the unique length and time scales of the μ+SR technique, we successfully clarify the magnetic ground state of LaSrNiReO6, which was previously deemed as a spin glass state. Instead, our μ+SR results point toward a long-range dynamically ordered ground state below TC=23 K, for which a static limit is foreseen at T=0. Furthermore, between 23K<T≤300K, three different magnetic phases are identified: a dense (23K<T<75K), a dilute (75K≤T≤250K), and a paramagnetic (T>250 K) state. Our results reveal how two separate yet intertwined magnetic lattices interact within the unique double perovskite structure and the importance of using complementary experimental techniques to obtain a complete understanding of the microscopic magnetic properties of complex materials.