TY - JOUR
T1 - Physical properties and magnetic structure of the layered oxyselenide La2 O3 Mn2 Se2
AU - Ni, N.
AU - Climent-Pascual, E.
AU - Jia, S.
AU - Huang, Q.
AU - Cava, R. J.
PY - 2010/12/16
Y1 - 2010/12/16
N2 - We report the characterization of the layered rare-earth manganese oxyselenide La2 O3 Mn2 Se2. The susceptibility data show a broad maximum near 350 K, indicating the existence of two-dimensional (2D) short-range ordering in this compound. A sharp feature associated with a short-range to long-range antiferromagnetic phase transition is seen at 163 K. A very small heat-capacity anomaly is detected around 163 K, indicating that most of the magnetic entropy is lost during the 2D ordering process. Both crystal and magnetic structures were studied by neutron powder diffraction at 300, 200, 150, 100, and 6 K. The structure was refined in space group I4/mmm with a=4.13939 (3) Å and c=18.8511 (2) Å at ambient temperature. No structural distortion was detected. The resulted magnetic structure is G-type with a propagation vector of k= (0,0,0) and an ordered magnetic moment of 4.147 (28) μB /Mn along c is found at 6 K. Warren peak shape analysis of the neutron-diffraction data near 22°is employed to characterize the increase in correlation length in the 2D magnetic state on approaching the three-dimensional ordering transition.
AB - We report the characterization of the layered rare-earth manganese oxyselenide La2 O3 Mn2 Se2. The susceptibility data show a broad maximum near 350 K, indicating the existence of two-dimensional (2D) short-range ordering in this compound. A sharp feature associated with a short-range to long-range antiferromagnetic phase transition is seen at 163 K. A very small heat-capacity anomaly is detected around 163 K, indicating that most of the magnetic entropy is lost during the 2D ordering process. Both crystal and magnetic structures were studied by neutron powder diffraction at 300, 200, 150, 100, and 6 K. The structure was refined in space group I4/mmm with a=4.13939 (3) Å and c=18.8511 (2) Å at ambient temperature. No structural distortion was detected. The resulted magnetic structure is G-type with a propagation vector of k= (0,0,0) and an ordered magnetic moment of 4.147 (28) μB /Mn along c is found at 6 K. Warren peak shape analysis of the neutron-diffraction data near 22°is employed to characterize the increase in correlation length in the 2D magnetic state on approaching the three-dimensional ordering transition.
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U2 - 10.1103/PhysRevB.82.214419
DO - 10.1103/PhysRevB.82.214419
M3 - Article
AN - SCOPUS:78650842368
SN - 1098-0121
VL - 82
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 21
M1 - 214419
ER -