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000056407 084__ $$2WoS$$aPhysics, Condensed Matter
000056407 1001_ $$0P:(DE-Juel1)144092$$aLi, H.-F.$$b0$$uFZJ
000056407 245__ $$aNeutron-diffraction study of structural transition and magnetic order in orthorhombic and rhombohedral La7/8Sr1/8Mn1-gammaO3+delta
000056407 260__ $$aBristol$$bIOP Publ.$$c2007
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000056407 520__ $$aWe report on a systematic neutron powder diffraction (NPD) study of polycrystalline La(7/8)Sr(1/8)Mn(1-γ)O(3+δ) compounds. We investigated the structural and magnetic phases and transitions in the temperature range between 10 and 900 K for two different samples: an Ar-annealed sample with an orthorhombic Pbnm (Z = 4; O) structure at room temperature and an air-sintered sample with a rhombohedral [Formula: see text] (Z = 2;R) structure at room temperature. At higher temperatures, above 400 K, both samples exhibit a rhombohedral structure. For the Ar-annealed sample, a Jahn-Teller (JT) transition occurs in the orthorhombic phase at about 298 K with very large variations in the Mn-O2' and Mn-O2 bond lengths and Mn-O1-Mn bond angle on cooling from 298 to 180 K. For this sample the ferromagnetic moment at 10 K in the magnetic space group Pb'n'm amounts to 3.22(5) μ(B)/Mn. In contrast, the air-sintered sample undergoes on cooling a structural transition from rhombohedral (R) to orthorhombic (O) with a mixed phase of nearly equal R and O repartition at 120 K. Ferromagnetic order develops in this sample at about 240 K with a low-temperature moment of 3.35(4) μ(B)/Mn at 10 K. The coherent JT distortion in its orthorhombic phase occurs below some 170 K. In addition, we have determined the coherent JT distortion parameter Δ, the tolerance factor t and the one-electron bandwidth W of the e(g)-band.
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000056407 7001_ $$0P:(DE-Juel1)130991$$aSu, Y.$$b1$$uFZJ
000056407 7001_ $$0P:(DE-Juel1)VDB57858$$aPersson, J.$$b2$$uFZJ
000056407 7001_ $$0P:(DE-Juel1)130836$$aMeuffels, P.$$b3$$uFZJ
000056407 7001_ $$0P:(DE-Juel1)VDB67499$$aWalter, J. M.$$b4$$uFZJ
000056407 7001_ $$0P:(DE-Juel1)VDB59998$$aSkowronek, R.$$b5$$uFZJ
000056407 7001_ $$0P:(DE-Juel1)130572$$aBrückel, T.$$b6$$uFZJ
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000056407 8567_ $$uhttp://dx.doi.org/10.1088/0953-8984/19/17/176226
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