Journal Article

FZJ-2020-01403

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Effects of Cr-doping on the Jahn-Teller, the orthorhombic to rhombohedral, and the magnetic transitions in LaMn1-xCrxO3 compounds

Georgalas, C. ; Samartzis, A. ; Biniskos, N.FZJ* ; Syskakis, E.

2020
Elsevier Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.physb.2020.412101

Abstract: We report on the electrical resistivity, the specific heat, and differential thermal analysis of LaMn1-xCrxO3 (x=0.00-0.35) polycrystalline compounds at T>300 K, as well as on their magnetic properties in the temperature range from 80 K to 280 K. The transport and the thermal results show that the isovalent substitution of Mn3+ by Cr3+ decreases the cooperative Jahn-Teller distortion and consequently affects orbital ordering in the whole concentration range. It is found that Cr drastically reduces the entropy change associated to the Jahn-Teller transition to negligible values for x≥0.20. The orthorhombic to rhombohedral transition is also displaced to lower temperatures by Cr-doping, however exhibiting non-zero associated enthalpy changes for all x. A ferromagnetic contribution develops in orbitally disordered alloys with x≥0.20. The paramagnetic to ferromagnetic transition temperatures show a similar variation upon increasing x as for the LaMn1-xGaxO3 system, implying a common origin for the ferromagnetic interaction in both systems.

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Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. JARA-FIT (JARA-FIT)
3. JCNS-ILL (JCNS-ILL)

Research Program(s):

1. 144 - Controlling Collective States (POF3-144) (POF3-144)
2. 524 - Controlling Collective States (POF3-524) (POF3-524)
3. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
4. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
5. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. ILL-IN12: Cold neutron 3-axis spectrometer

Appears in the scientific report 2020

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; IF < 5 ; JCR ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; Nationallizenz ; SCOPUS ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Science Citation Index Expanded ; Web of Science Core Collection ; Web of Science Core Collection

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