Lattice effects on the magnetic and transport properties in La1.4Sr1.6−A Mn2O7 (A=Ca, Ba)

Chi, E.O.; Kwon, Young‐Uk; Kim, J.-T.; Hur, Nam Hwi

doi:10.1016/s0038-1098(99)00101-5

Cited by 20 publications

(21 citation statements)

References 25 publications

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“…It shows that the substitution of Ca or Ba for Sr suppresses the ferromagnetism of the system. Similar results were also reported by Chi et al [12] in La 1.4 A 1.6 − x Mn 2 O 7 (A = Ca, Ba).…”

Section: Resultssupporting

confidence: 91%

Electrical transport and magnetic properties of La4/3Sr5/3Mn2O7

Liu

Xia

Yuan

2006

Materials Science and Engineering: B

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Section: Resultssupporting

confidence: 91%

Electrical transport and magnetic properties of La4/3Sr5/3Mn2O7

Liu

Xia

Yuan

2006

Materials Science and Engineering: B

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“…29,45 A more complex behavior is observed for the argon-annealed compounds, for which the T values, always lower with respect to T values of the as-prepared samples, reduce from 83 to 71 K going from the Ca-undoped sample to the y = 0.25 one and increase to 100 K for the y = 0.50 composition.…”

Section: Electrical Conductivity and Magnetoresistivitymentioning

confidence: 92%

“…The extent of this solid solution showed a limit for y ϳ 0.5. 29 Finally, in order to vary the oxygen content, the samples underwent two different annealing treatments, i.e., in pure oxygen and pure argon.…”

Section: Introductionmentioning

confidence: 99%

Oxygen content variation and cation doping dependence of(La)1.4(Sr1−yCay)1.6Mn
Malavasi
¹
,
Mozzati
²
,
Tealdi
³

et al. 2006
Phys. Rev. B
8
5
12
0
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The results of the synthesis and characterization of the optimally doped ͑La͒ 1.4 ͑Sr 1−y Ca y ͒ 1.6 Mn 2 O 7±␦ solid solution with y = 0, 0.25, and 0.5 are reported. By progressively replacing the Sr with the smaller Ca, while keeping fixed the hole concentration due to the divalent dopant, the "size effect" of the cation itself on the structural, transport, and magnetic properties of the bilayered manganite has been analyzed. Two different annealing treatments of the solid solution, in pure oxygen and in pure argon, allowed us to also study the effect of the oxygen content variation. Structure and electronic properties of the samples have been investigated by means of x-ray powder diffraction and x-ray absorption spectroscopy measurements. Magnetoresistivity and static magnetization measurements have been carried out to complete the samples characterization. Oxygen annealing of the solid solution, which showed a limit for y ϳ 0.5, induces an increase of the Mn average valence state and a transition of the crystal structure from tetragonal to orthorhombic while the argon annealing induces an oxygen understoichiometry and, in turn, a reduction of the Mn average valence state. Along with the Ca substitution, the Jahn-Teller distortion of the MnO 6 octahedra is reduced. This has been directly connected to a general enhancement of the transport properties induced by the Ca doping. For the same cation composition, oxygen overstoichiometry leads to higher metal-insulator transition temperatures and lower resistivity values. Curie temperatures ͑T C ͒ are reduced by increasing the Ca doping. The lower T C for all the annealed samples with respect to the as-prepared ones are connected to the strong influence on the magnetic interactions of the point defects due to the ␦-variation.

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“…Hence, a natural array of ferromagnetic-insulator-ferromagnetic junctions is present in the structure of these materials, which in effect may lead to large CMR at low magnetic field, i.e. low field magnetoresistance (LFMR) [5]. Further, the distribution of the various R(A) ions between perovskite site and rock salt site, which leads to anisotropic lattice behaviour, is dependent on the dopant ion size.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ca substitution on transport and magnetic properties of double‐layered manganite La_1.2Sr_1.8Mn₂O₇

Reddy

Kumar

Rawat

et al. 2007

Physica Status Solidi (b)

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The resistivity, magnetoresistance (MR) and magnetization of double-layered manganite La 1.2 Sr 1.8-x Ca x Mn 2 O 7 (0.0 ≤ x ≤ 0.4) are studied to investigate the effect of substitution of Ca 2+ for Sr 2+ on the transport and magnetic properties. The resistivity data suggest that Ca doping results in the decrease of insulator-tometal transition temperature, T IM . The conduction mechanism above T IM is found to be of Mott variable range hopping type. The highest MR ratios (∆ρ/ρ 0 ) of 73% (H = 1.5 T) and 93% (H = 4 T) are observed for x = 0.3 sample at ~25 K. The variation of MR with temperature and applied magnetic field is discussed. A secondary transition at T * is observed in all the samples, which may be due to the twodimensional short-range ferromagnetic ordering.

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Lattice effects on the magnetic and transport properties in La1.4Sr1.6−A Mn2O7 (A=Ca, Ba)

Cited by 20 publications

References 25 publications

Electrical transport and magnetic properties of La4/3Sr5/3Mn2O7

Electrical transport and magnetic properties of La4/3Sr5/3Mn2O7

Oxygen content variation and cation doping dependence of(La)1.4(Sr1−yCay)1.6Mn
Malavasi
¹
,
Mozzati
²
,
Tealdi
³

et al. 2006
Phys. Rev. B
8
5
12
0
View full text Add to dashboard Cite

Effect of Ca substitution on transport and magnetic properties of double‐layered manganite La_1.2Sr_1.8Mn₂O₇

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Lattice effects on the magnetic and transport properties in La1.4Sr1.6−A Mn2O7 (A=Ca, Ba)

Cited by 20 publications

References 25 publications

Electrical transport and magnetic properties of La4/3Sr5/3Mn2O7

Electrical transport and magnetic properties of La4/3Sr5/3Mn2O7

Oxygen content variation and cation doping dependence of(La)1.4(Sr1−yCay)1.6MnMalavasi1, Mozzati2, Tealdi3 et al. 2006Phys. Rev. B85120View full textAdd to dashboardCite

Effect of Ca substitution on transport and magnetic properties of double‐layered manganite La1.2Sr1.8Mn2O7

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Oxygen content variation and cation doping dependence of(La)1.4(Sr1−yCay)1.6Mn
Malavasi
¹
,
Mozzati
²
,
Tealdi
³

et al. 2006
Phys. Rev. B
8
5
12
0
View full text Add to dashboard Cite

Effect of Ca substitution on transport and magnetic properties of double‐layered manganite La_1.2Sr_1.8Mn₂O₇