Magnetic excitations in long-range stripe-ordered Pr2NiO4+δ

Physical review. B./Physical review. B, vol. 103

Abstract

We report an inelastic neutron scattering study on the magnetic excitations of ${\mathrm{Pr}}_{2}{\mathrm{NiO}}_{4+\ensuremath{\delta}}$ ($\ensuremath{\delta}\ensuremath{\sim}0.24\ifmmode\pm\else\textpm\fi{}0.01$) at $T=10$ K. Spin stripe ordering becomes pronounced below $\ensuremath{\sim}220$ K with an incommensurability $\ensuremath{\epsilon}\ensuremath{\approx}0.346$, and a strong influence of interstitial oxygen is identified on establishing a long-range spin stripe ordering. Apart from the Goldstone modes emerging from the magnetic satellites (${\mathbf{q}}_{m}$), multiple homologous modes are observed along the spin stripe modulation separated by $\mathrm{\ensuremath{\Delta}}{\mathbf{q}}_{m}\ensuremath{\approx}0.076$ in reciprocal lattice units, which is interpreted by the internal periodicity of the long-range ordered discommensurated spin stripes.

Authors 6

1. Avishek Maity

   Technical University of Munich · Heinz Maier-Leibnitz Zentrum

   Affiliation as printed

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

2. Rajesh Dutta Aachen Institut für Kristallographie

   RWTH Aachen University · Heinz Maier-Leibnitz Zentrum

   Affiliation as printed

   Institut für Kristallographie, RWTH Aachen Universität, 52066 Aachen, Germany

   Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), 85747 Garching, Germany

3. Anna Marsicano

   Centre National de la Recherche Scientifique · Université de Montpellier · École Nationale Supérieure de Chimie de Montpellier · Institut Charles Gerhardt Montpellier

   Affiliation as printed

   Institut Charles Gerhardt Montpellier, Université de Montpellier, CNRS-ENSCM, 34095 Montpellier, France

4. Andrea Piovano

   Institut Laue-Langevin

   Affiliation as printed

   Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France

5. J. R. Stewart

   Rutherford Appleton Laboratory · ISIS Neutron and Muon Source

   Affiliation as printed

   ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom

6. Werner Paulus

   Centre National de la Recherche Scientifique · Université de Montpellier · École Nationale Supérieure de Chimie de Montpellier · Institut Charles Gerhardt Montpellier

   Affiliation as printed

   Institut Charles Gerhardt Montpellier, Université de Montpellier, CNRS-ENSCM, 34095 Montpellier, France