Lattice effects and magnetic structure in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7, x = 0.3
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Lattice effects and magnetic structure in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7, x = 0.3. / Argyriou, D. N.; Mitchell, J. F.; Radaelli, P. G.; Bordallo, H. N.; Cox, D. E.; Medarde, M.; Jorgensen, J. D.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 59, No. 13, 01.01.1999, p. 8695-8702.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Lattice effects and magnetic structure in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7, x = 0.3
AU - Argyriou, D. N.
AU - Mitchell, J. F.
AU - Radaelli, P. G.
AU - Bordallo, H. N.
AU - Cox, D. E.
AU - Medarde, M.
AU - Jorgensen, J. D.
PY - 1999/1/1
Y1 - 1999/1/1
N2 - 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 (TIM) 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.
AB - 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 (TIM) 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.
UR - http://www.scopus.com/inward/record.url?scp=0000575553&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.59.8695
DO - 10.1103/PhysRevB.59.8695
M3 - Journal article
AN - SCOPUS:0000575553
VL - 59
SP - 8695
EP - 8702
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 13
ER -
ID: 209601740