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Dec 8 – 9, 2022
Marriott
Europe/Berlin timezone

Magnetic excitations in long-range stripes of Pr2NiO4+δ

Dec 8, 2022, 3:50 PM
25m
Marriott

Marriott

Talk (20 min + 5 min discussion) Quantum Phenomena Quantum Phenomena

Speaker

Avishek Maity (Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, 85747 Garching, Germany)

Description

Magnetic excitations in stripe-phases of $La-$based hole-doped $214-$ nickelates, especially in the $Sr-$doped ones, have been vigorously explored using inelastic neutron scattering (INS) studies. In $Sr-$ doped samples, the spin stripe correlation is relatively short-ranged due to unavoidable disorder introduced by the randomly distributed dopant. However, often the results have been compared with the linear spin wave (LSW) theory-based calculations, which assume long-range spin-stripe ordering.

In this talk, we will present the effect of long-range spin stripe ordering on the magnetic excitations of an $O-$ doped $214-$ nickelate Pr$_2$NiO$_{4+δ}$ ($\delta \sim 0.24$), where we find the spin stripe correlation is quite long-ranged $(\sim 50$ Å) compared to the $Sr-$ doped Pr$_{2-x}$SrNiO$_4$ ($\sim 20$ Å). For our investigation, we have performed the INS measurements using the thermal triple-axis spectrometer PUMA at MLZ, IN8 at ILL, and time-of-fight spectrometer MAPS at ISIS. Our investigation presents an intriguing observation of multiple equivalent weak modes in the spin wave dispersion of $O-$ doped Pr$_{2-x}$SrNiO$_4$ [1], which we have interpreted from the internal periodicity of the long-range ordered discommensurated spin stripes.

Reference: [1] A. Maity, R. Dutta, A. Marsicano, A Piovano, J. Ross Stewart and W. Paulus Phys. Rev. B 103, L100401 (2021).

Primary author

Avishek Maity (Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, 85747 Garching, Germany)

Co-authors

Dr Rajesh Dutta (Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), 85747 Garching, Germany) Anna Marsicano (Institut Charles Gerhardt Montpellier, Université de Montpellier, CNRS-ENSCM, 34095 Montpellier, France) Andrea Piovano (Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France) J. Ross Stewart (ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom) Werner Paulus (Institut Charles Gerhardt Montpellier, Université de Montpellier, CNRS-ENSCM, 34095 Montpellier, France)

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