ISIS Neutron and Muon Source Data Journal
This is a page describing data taken during an experiment at the ISIS Neutron and Muon Source. Information about the ISIS Neutron and Muon Source can be found at https://www.isis.stfc.ac.uk.
Calcium Deficiency and Its Influence on Structure, Magnetism, and Magnetocaloric Effects in La0.7Ca0.2-x?xSr0.1MnO3 (x = 0.00, 0.05, and 0.10) Manganites
Abstract: Hole-doped lanthanum manganites with the formula La1-xAxMnO3 (A = Ca3+, Sr2+) exhibit rich magnetic and structural phenomena, including complex magnetic phase transitions and significant magnetocaloric effects (MCE). Recent studies on La0.7Ca0.2-x?xSr0.1MnO3 (x = 0.00, 0.05, 0.10) have shown that Ca2+ vacancies (?) induce changes in Mn oxidation states, structural disorder, and magnetic complexity near the Curie temperature (TC), contributing to anomalous MCE behavior. However, conventional magnetometry lacks the resolution to differentiate between coexisting or short-range magnetic phases. In this proposal, we seek to perform high-resolution neutron diffraction measurements using the GEM diffractometer to probe both nuclear and magnetic structures across a range of temperatures (100?350 K). This will enable detailed analysis of atomic positions, site occupancy, thermal displacements, and magnetic ordering, as well as nuclear density profiles via the maximum entropy method (MEM). By correlating these features with the enhanced -?SM, we aim to uncover the underlying structural and magnetic mechanisms responsible for the observed MCE. We request 3 days of beam time to complete a full temperature-dependent study of the three compositions under zero-field conditions.
Principal Investigator: Dr Maykel Manawan
Experimenter: Dr Devashi Adroja
Experimenter: Miss Okvarahireka Vitayaya
Experimenter: Mr Phahul Zhemas Zul Nehan
Experimenter: Dr Dita Puspita Sari
Experimenter: Dr Budhy Kuniawan
Local Contact: Dr Ivan da Silva Gonzalez
Experimenter: Dr Indri Badria Adilina
Experimenter: Mrs Maya Puspitasari Izaak
DOI: 10.5286/ISIS.E.RB2520349
ISIS Experiment Number: RB2520349
| Part DOI | Instrument | Public release date | Download Link |
|---|---|---|---|
| 10.5286/ISIS.E.RB2520349-1 | GEM | 20 February 2029 | Download |
Publisher: STFC ISIS Neutron and Muon Source
Data format: RAW/Nexus
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Data Citation
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publication is as:
[author], [date], [title], [publisher],
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For Example:
Dr Maykel Manawan et al; (2026): Calcium Deficiency and Its Influence on Structure, Magnetism, and Magnetocaloric Effects in La0.7Ca0.2-x?xSr0.1MnO3 (x = 0.00, 0.05, and 0.10) Manganites, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2520349
Data is released under the CC-BY-4.0 license.
