Interplay of spin and orbital ordering in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7 (0.5≤x≤ 1.0)
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Interplay of spin and orbital ordering in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7 (0.5≤x≤ 1.0). / Ling, C. D.; Millburn, J. E.; Mitchell, J. F.; Argyriou, D. N.; Linton, J.; Bordallo, H. N.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 62, No. 22, 01.12.2000, p. 15096-15111.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Interplay of spin and orbital ordering in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7 (0.5≤x≤ 1.0)
AU - Ling, C. D.
AU - Millburn, J. E.
AU - Mitchell, J. F.
AU - Argyriou, D. N.
AU - Linton, J.
AU - Bordallo, H. N.
PY - 2000/12/1
Y1 - 2000/12/1
N2 - The crystallographic and magnetic phase diagram of the n = 2 layered manganite La2-2xSr1+2xMn2O7 in the region x≥0.5 has been studied using temperature-dependent neutron powder diffraction. The magnetic phase diagram reveals a progression of ordered magnetic structures generally paralleling that of three-dimensional (3D) perovskites with similar electronic doping: A (0.5≤x≤0.66)→C (0.75≤x≤0.90)→G (0.90≤x≤1.0). However, the quasi-2D structure amplifies this progression to expose features of manganite physics uniquely accessible in the layered systems: (i) a "frustrated" region between the A and C regimes where no long-range magnetic order is observed; (ii) magnetic polytypism arising from weak interbilayer magnetic exchange in the type-C regime; and (iii) a tetragonal-to-orthorhombic phase transition whose temperature evolution directly measures ordering of d3y2-r2 orbitals in the a-b plane. This orbital-ordering transition is precursory to type-C magnetic ordering, where ferromagnetic rods lie parallel to the b axis. These observations support the notion that eg orbital polarization is the driving force behind magnetic spin ordering. Finally, in the crossover region between type-C and type-G states, we see some evidence for the development of local type-C clusters embedded in a type-G framework, directly addressing proposals of similar short-range magnetic ordering in highly doped La1-xCaxMnO3 perovskites.
AB - The crystallographic and magnetic phase diagram of the n = 2 layered manganite La2-2xSr1+2xMn2O7 in the region x≥0.5 has been studied using temperature-dependent neutron powder diffraction. The magnetic phase diagram reveals a progression of ordered magnetic structures generally paralleling that of three-dimensional (3D) perovskites with similar electronic doping: A (0.5≤x≤0.66)→C (0.75≤x≤0.90)→G (0.90≤x≤1.0). However, the quasi-2D structure amplifies this progression to expose features of manganite physics uniquely accessible in the layered systems: (i) a "frustrated" region between the A and C regimes where no long-range magnetic order is observed; (ii) magnetic polytypism arising from weak interbilayer magnetic exchange in the type-C regime; and (iii) a tetragonal-to-orthorhombic phase transition whose temperature evolution directly measures ordering of d3y2-r2 orbitals in the a-b plane. This orbital-ordering transition is precursory to type-C magnetic ordering, where ferromagnetic rods lie parallel to the b axis. These observations support the notion that eg orbital polarization is the driving force behind magnetic spin ordering. Finally, in the crossover region between type-C and type-G states, we see some evidence for the development of local type-C clusters embedded in a type-G framework, directly addressing proposals of similar short-range magnetic ordering in highly doped La1-xCaxMnO3 perovskites.
UR - http://www.scopus.com/inward/record.url?scp=0034451359&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.62.15096
DO - 10.1103/PhysRevB.62.15096
M3 - Journal article
AN - SCOPUS:0034451359
VL - 62
SP - 15096
EP - 15111
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 22
ER -
ID: 218267641