Journal Article

PreJuSER-3497

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Crystal and magnetic structure of single-crystal La1-xSrxMnO3 (x ~ 1/8)

Li, H.-F.FZJ* ; Su, Y.FZJ* ; Xiao, Y. G.FZJ* ; Persson, J.FZJ* ; Meuffels, P.FZJ* ; Brückel, T.FZJ*

2009
Springer Berlin

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Please use a persistent id in citations: doi:10.1140/epjb/e2009-00019-5

Abstract: A neutron powder diffraction (NPD) study on the crystal and magnetic structure of a crushed La1-xSrxMnO3 (x approximate to 1/8) single crystal has been performed. The sample belongs to orthorhombic (Pnma, O) above the Jahn-Teller (JT) transition temperature (T-JT) and monoclinic (P12(1)/c1, M') in the JT regime. We have also refined the NPD data below the charge/orbital ordering (CO/OO) temperature (T-CO/OO) with a monoclinic (P12(1)/c1, M'') model because the experimental resolution was insufficient to clearly identify a triclinic (P (1) over bar) structure. The refined lattice parameters show an obvious breathing-mode distortion between T-CO/OO and T-JT, accompanied by a large deviation of the monoclinic angle beta from 90 degrees, signifying a very strong cooperative JT distortion. A ferromagnetic (FM) moment of 3.43(5) mu(B)/Mn besides an A-type antiferromagnetic (A-AFM) moment of 0.54(2) mu(B)/Mn is directed mainly along the b axis in P12(1)/c1 symmetry at 5 K. With increasing temperature, the A-AFM domains transform into FM ones above similar to 100 K and the FM spin orientation turns from the b to the c axis in crystallographic b-c plane below T-c = 187(1) K. The magnetization measurements show typical anomalies around T-CO/OO and T-JT. The measured saturation moment of 3.9(1) mu(B)/Mn at 70 kOe and 5 K is well consistent with the sum 3.97(5) mu(B)/Mn of the refined FM and A-AFM moments at 5 K, implying the A-AFM spins are aligned in field direction at 70 kOe. The applied magnetic field can affect the paramagnetic insulating (PMI) state in the range of magnetic polarons. Based on the size of JT distortion and the bond-valence sums (BVS's), the CO/OO phenomenon is being discussed.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Streumethoden (IFF-4)
2. Neutronenstreuung (IFF-5)
3. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)
4. JCNS (Jülich Centre for Neutron Science JCNS (JCNS) ; JCNS)
5. Elektronische Materialien (IFF-6)

Research Program(s):

1. Kondensierte Materie (P54)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Experiment(s):

1. DNS: Diffuse scattering neutron time of flight spectrometer (NL6S)
2. SPODI: High resolution powder diffractometer (SR8a)

Appears in the scientific report 2009

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