Lattice effects and magnetic structure in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7, x = 0.3
We report on the temperature dependence of the crystal and magnetic structure of the layered colossal magnetoresistive manganite, La2-2xSr1+2xMn2O7, x=0.3. Neutron-diffraction measurements show that the insulator-metal (IM) transition (7IM) at ∼100 K is accompanied by a ferromagnetic (FM) ordering o...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
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1999
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| _version_ | 1826263341299924992 |
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| author | Argyriou, D Mitchell, J Radaelli, P Bordallo, H Cox, D Medarde, M Jorgensen, J |
| author_facet | Argyriou, D Mitchell, J Radaelli, P Bordallo, H Cox, D Medarde, M Jorgensen, J |
| author_sort | Argyriou, D |
| collection | OXFORD |
| description | We report on the temperature dependence of the crystal and magnetic structure of the layered colossal magnetoresistive manganite, La2-2xSr1+2xMn2O7, x=0.3. Neutron-diffraction measurements show that the insulator-metal (IM) transition (7IM) at ∼100 K is accompanied by a ferromagnetic (FM) ordering of spins within MnO6 bilayers (intrabilayer coupling), but with an antiferromagnetic coupling between neighboring bilayers (interbilayer coupling). Below TIM, the Mn spins rotate from ∼45° inclination to the c axis until they are almost parallel to the c axis at 5 K. Coincident with this spin reorientation, a FM c axis component develops below 75 K. Evidence from both neutron and synchrotron x-ray-diffraction experiments suggest that the FM c-axis magnetic moment results from a second layered manganite phase with composition 0.3≲x ≲0.32. This observation emphasizes the need for thorough examination of the homogeneity when measuring bulk properties (e.g., magnetization, transport) of nominally x=0.3 samples. Associated with the electronic and magnetic transitions, a pronounced lattice response along the c axis (observed in both phases) signals a transfer of charge into dx2-y2 orbitals in the low-temperature phase. That the lattice effects here are opposite in sign to those observed in the x=0.4 layered manganite points to the sensitivity of the spin-lattice-charge coupling to dopant concentration in these reduced-dimensionality manganites. ©1999 The American Physical Society. |
| first_indexed | 2024-03-06T19:50:13Z |
| format | Journal article |
| id | oxford-uuid:23b604c1-9c3d-4a1a-9690-9c82fdceda5b |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:50:13Z |
| publishDate | 1999 |
| record_format | dspace |
| spelling | oxford-uuid:23b604c1-9c3d-4a1a-9690-9c82fdceda5b2022-03-26T11:45:48ZLattice effects and magnetic structure in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7, x = 0.3Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:23b604c1-9c3d-4a1a-9690-9c82fdceda5bEnglishSymplectic Elements at Oxford1999Argyriou, DMitchell, JRadaelli, PBordallo, HCox, DMedarde, MJorgensen, JWe report on the temperature dependence of the crystal and magnetic structure of the layered colossal magnetoresistive manganite, La2-2xSr1+2xMn2O7, x=0.3. Neutron-diffraction measurements show that the insulator-metal (IM) transition (7IM) at ∼100 K is accompanied by a ferromagnetic (FM) ordering of spins within MnO6 bilayers (intrabilayer coupling), but with an antiferromagnetic coupling between neighboring bilayers (interbilayer coupling). Below TIM, the Mn spins rotate from ∼45° inclination to the c axis until they are almost parallel to the c axis at 5 K. Coincident with this spin reorientation, a FM c axis component develops below 75 K. Evidence from both neutron and synchrotron x-ray-diffraction experiments suggest that the FM c-axis magnetic moment results from a second layered manganite phase with composition 0.3≲x ≲0.32. This observation emphasizes the need for thorough examination of the homogeneity when measuring bulk properties (e.g., magnetization, transport) of nominally x=0.3 samples. Associated with the electronic and magnetic transitions, a pronounced lattice response along the c axis (observed in both phases) signals a transfer of charge into dx2-y2 orbitals in the low-temperature phase. That the lattice effects here are opposite in sign to those observed in the x=0.4 layered manganite points to the sensitivity of the spin-lattice-charge coupling to dopant concentration in these reduced-dimensionality manganites. ©1999 The American Physical Society. |
| spellingShingle | Argyriou, D Mitchell, J Radaelli, P Bordallo, H Cox, D Medarde, M Jorgensen, J Lattice effects and magnetic structure in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7, x = 0.3 |
| title | Lattice effects and magnetic structure in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7, x = 0.3 |
| title_full | Lattice effects and magnetic structure in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7, x = 0.3 |
| title_fullStr | Lattice effects and magnetic structure in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7, x = 0.3 |
| title_full_unstemmed | Lattice effects and magnetic structure in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7, x = 0.3 |
| title_short | Lattice effects and magnetic structure in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7, x = 0.3 |
| title_sort | lattice effects and magnetic structure in the layered colossal magnetoresistance manganite la2 2xsr1 2xmn2o7 x 0 3 |
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