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Ultrafast magnetic dynamics in insulating YBa$_{2}$Cu$_{3}$O$_{6.1}$ revealed by time resolved two-magnon Raman scattering

Yang, Jhih-An; Pellatz, Nicholas; Wolf, Thomas; Nandkishore, Rahul; Reznik, Dmitry

Abstract:
Measurement and control of magnetic order and correlations in real time is a rapidly developing scientific area relevant for magnetic memory and spintronics. In these experiments an ultrashort laser pulse (pump) is first absorbed by excitations carrying electric dipole moment. These then give their energy to the magnetic subsystem monitored by a time-resolved probe. A lot of progress has been made in investigations of ferromagnets but antiferromagnets are more challenging. Here, we introduce time-resolved two-magnon Raman scattering as a real time probe of magnetic correlations especially well-suited for antiferromagnets. Its application to the antiferromagnetic charge transfer insulator YBa$_{2}$Cu$_{3}$O$_{6.1}$ revealed rapid demagnetization within 90 fs of photoexcitation. The relaxation back to thermal equilibrium is characterized by much slower timescales. We interpret these results in terms of slow relaxation of the charge sector and rapid equilibration of the magnetic sector to a prethermal state characterized by parameters that change slowly as the charge sector relaxes.

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Verlagsausgabe §
DOI: 10.5445/IR/1000120203
Veröffentlicht am 16.06.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000120203
HGF-Programm 43.21.01 (POF III, LK 01) Quantum Correlations in Condensed Matter
Erschienen in Nature Communications
Verlag Nature Research
Band 11
Heft 1
Seiten Art.Nr. 2548
Vorab online veröffentlicht am 21.05.2020
Nachgewiesen in arXiv
Dimensions
Web of Science
Scopus
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