ISIS Neutron and Muon Source Data Journal

Investigation of the Emergent Magnetic Excitations in the Hole Doped Manganites Compounds of La0.7Ca0.2-x?xSr0.1MnO3 (x = 0.0 ? 0.1)

Abstract: We propose inelastic neutron scattering (INS) measurements on La0.7Ca0.2-x xSr0.1MnO3 (x = 0.05 0.10) to investigate magnetic excitations and exchange interactions near the Curie temperature (TC). Cation deficiency ( ) introduces Mn2+ alongside Mn3+ and Mn4+, leading to competing super-exchange and double-exchange interactions that produce complex magnetic phases and anomalous magnetocaloric effects (MCE). Preliminary data from XPS and neutron powder diffraction suggest inhomogeneous magnetic states and spin fluctuation effects, especially in LV-10-SSR, but the nature of magnetic excitations remains unresolved. INS on the MERLIN spectrometer will allow us to map spin-wave spectra and quantify exchange parameters across temperature and composition. Measurements will be performed at 5 K, 150 K, and 360 K using Ei = 100 meV and rep-rate multiplication for simultaneous spectra at lower energies. The data will be analyzed using linear spin wave theory (SPINW) to distinguish long-range and short-range magnetic order and identify coexisting phases. This study will provide critical insight into the role of Mn valence mixing and cation deficiency in driving phase transitions and enhancing MCE. We request 4 days of beam time to measure six compositions and complete the excitation mapping essential to our broader investigation of magnetic structure.

Principal Investigator: Dr Budhy Kuniawan
Experimenter: Mr Kuldeep Singh Chikara
Experimenter: Dr Maykel Manawan
Local Contact: Dr Devashi Adroja
Experimenter: Mr Phahul Zhemas Zul Nehan
Experimenter: Miss Okvarahireka Vitayaya
Experimenter: Professor Jia Hong Pan
Experimenter: Miss Viska Feriskawati Rolobessy

DOI: 10.5286/ISIS.E.RB2610197

ISIS Experiment Number: RB2610197

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Dr Budhy Kuniawan et al; (2026): Investigation of the Emergent Magnetic Excitations in the Hole Doped Manganites Compounds of La0.7Ca0.2-x?xSr0.1MnO3 (x = 0.0 ? 0.1), STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2610197

Data is released under the CC-BY-4.0 license.