Ultrafast signatures of spin and orbital order in antiferromagnetic α-Sr2CrO4

Lee, Min-Cheol; Occhialini, Connor; Li, Jiarui; Zhu, Zhihai; Sirica, Nicholas S.; Mix, L. T.; Kim, Soyeun; Yarotski, Dmitry A.; Comin, Riccardo; Prasankumar, Rohit P.

doi:10.1038/s42005-022-01110-y

Title: Ultrafast signatures of spin and orbital order in antiferromagnetic α-Sr2CrO4

Journal Article · Sat Dec 24 00:00:00 EST 2022 · Communications Physics

DOI:https://doi.org/10.1038/s42005-022-01110-y· OSTI ID:1906765

;

; Zhu, Zhihai;

; Mix, L. T.; Kim, Soyeun; Yarotski, Dmitry A.;

;

Abstract The antiferromagnetic Mott insulator α -Sr ₂ CrO ₄ possesses multiple spin and orbital ordered phases, but their unique interplay is still relatively unexplored. Here, we used femtosecond optical spectroscopy to study ultrafast spin and orbital ordering dynamics in α -Sr ₂ CrO ₄ through their non-equilibrium response to photoexcitation. By varying the pump photon energy, we selectively drove inter-site spin hopping between neighboring Cr t _{2 g} orbitals and charge transfer-type transitions between oxygen 2 p and Cr e _g orbitals. The resulting transient reflectivity dynamics revealed temperature-dependent anomalies across the Néel temperature for spin ordering as well as the transition temperatures linked to different types of orbital order. Our results reveal distinct relaxation timescales for spin and orbital orders in α -Sr ₂ CrO ₄ and provide experimental evidence for the phase transition at T _O , possibly related to antiferro-type orbital ordering.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001; SC0019126

OSTI ID:: 1906765

Alternate ID(s):: OSTI ID: 2305310

Report Number(s):: LA-UR-21-30557; 335; PII: 1110

Journal Information:: Communications Physics, Journal Name: Communications Physics Vol. 5 Journal Issue: 1; ISSN 2399-3650

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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