Approaching the quantum critical point in a highly correlated all-in–all-out antiferromagnet
Year: 2020
Type: article
Abstract: All-in--all-out (AIAO) antiferromagnets demonstrate vividly the effects of correlated charge and spin with strong spin-orbit coupling. Here, using resonant magnetic x-ray diffraction, the authors directly track the evolution of AIAO order in the pyrochlore Sm${}_{2}$Ir${}_{2}$O${}_{7}$ across a pressure-tuned quantum critical point. The results demonstrate a powerful approach to the quantum critical state driven by electron correlations $U$/$t$ and spin orbit coupling $\ensuremath{\lambda}$/$t$. The authors find prominent Ising-type spin fluctuations under pressure instead of the Heisenberg-type seen via chemical doping. This work also circumscribes the region of interest for the putative magnetic Weyl semimetal state in Pressure-Temperature space.
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, U.S. Department of Energy, California Institute of Technology, Cabinet Office, Government of Japan, Okinawa Institute of Science and Technology Graduate University, Engineering and Physical Sciences Research Council, Division of Materials Research, Basic Energy Sciences, Argonne National Laboratory
Awards: G102163711, G107546177, G1286251239, G1313983767, G1664757510, New correlated electronic states arising from strong spin-orbit coupling, G262962599, G3075337988, G3183489873, G3589692066, G426311843, G513797252, G5387317844, Emergence of novel electronic states in 5d transition metal oxides, G5904151224, Pressure Tuning of Competing Quantum States, G6848031779, G7365054132, G7583137537, G8116587412, G969889393
OpenAlex ID: W2997033263