Relation between Crystal and Magnetic Structures of Layered Manganite La2-2xSr1+2xMn2O7(0.30≤x≤0.50)

Kubota, Masato; Fujioka, Hirofumi; Hirota, K.; Ohoyama, Kenji; Moritomo, Y.; Yoshizawa, H.; Endoh, Y.

doi:10.1143/jpsj.69.1606

Cited by 129 publications

(101 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sample was characterized by resistivity, powder x-ray diffraction, and magnetization mea-2 surements. The observed ferromagnetic transition temperature T C was 127K, which is consistent with the previously reported one [17]. From powder x-ray diffraction measurements at room temperature and Rietveld analysis, we confirmed that the grown crystal was a single phase without an impurity phase.…”

supporting

confidence: 90%

Transient differential reflectivity of ferromagnetic and paramagnetic phases in the bilayered manganite La1.24Sr1.76Mn2O7

Hirobe

Kubo

Kouyama

et al. 2005

Solid State Communications

View full text Add to dashboard Cite

supporting

confidence: 90%

Transient differential reflectivity of ferromagnetic and paramagnetic phases in the bilayered manganite La1.24Sr1.76Mn2O7

Hirobe

Kubo

Kouyama

et al. 2005

Solid State Communications

View full text Add to dashboard Cite

“…The discovery of the colossal magnetoresistance effect in the La 2−2x Sr 1+2x Mn 2 O 7 manganite, which represents the n = 2 member of the Ruddlesden-Popper series of manganites, has attracted special interest due to its crystal structure forming a naturally layered system [4][5][6][7][8]. In particular, distinct features of the bilayeredmanganites are the anisotropic characteristics in both charge-transport and magnetic properties and the reduced dimensionality of the Mn-OMn networks which leads to several intriguing changes including enhanced MR effects, large magneto-caloric effects, unconventional magnetostriction, and anisotropic transport in charge carriers.…”

Section: Introductionmentioning

confidence: 99%

Structural and magnetic properties of layered perovskite manganite LaCaBiMn₂O₇

Oubla

Lamire

Lassri

et al. 2013

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract. The layered perovskite oxide, LaCaBiMn 2 O 7 , has been prepared by the conventional aqueous solution precipitation method. The powder X-ray diffraction studies suggest that the phase crystallizes with tetragonal unit cell in the space group I4/mmm. The magnetic properties suggest that the ferromagnetic interactions are dominant and manganese ion in the phase is present in mixed valence states Mn 3+ and Mn 4+ . The thermomagnetization curve is found to obey the Bloch law. Spin wave stiffness constant D and the approximate value for J MnMn exchange interaction were estimated from the experimental results.

show abstract

“…However, the change in dimensionality and resulting pronounced cation dependence of the electronic properties can produce physical properties which contrast strongly with the perovskite systems [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Absence of Long-Range Magnetic Order in the La_1.4Sr_0.8Ca_0.8Mn₂O₇ Bilayered Manganite

Malavasi¹,

Mozzati²,

Pomjakushin³

et al. 2006

J. Phys. Chem. B

View full text Add to dashboard Cite

In this work we studied, by means of high-resolution neutron diffraction as a function of temperature, the La 1.4 Sr 0.8 Ca 0.8 Mn 2 O 7 bilayered manganite for two different annealing treatments. Out data allowed us to shown, for the first time, the absence of long-range magnetic order in this optimally doped bilayered manganite where the A-site of the structure is doped with equal proportions of different isovalent cations (Ca and Sr). The system, however, presents defined IM transitions which suggest that the transport properties are not linked to the evolution of long-range order and that two dimensional spin ordering in the layers of the perovskite blocks may be sufficient to "assist" the hole hopping.Possible reason for the suppression of magnetic order induced by the Ca doping is a size effect coupled to the cation size mismatch between the Sr and Ca ions. IntroductionThere is an increasing interest in materials that show magnetoresistance, because of their use in magnetic information storage or as magnetic field sensors [1]. Most of the available theoretical and experimental work has, until now, been focused on the 3D perovskite structures, that is the n=∞ endmember of the A n+1 B n O 3n+1 Ruddlesden-Popper family, in which n 2D layers of BO 6 corner-sharing octahedra are joined along the stacking direction and separated by rock-salt AO layers.The optimally-doped n=2 members of this family (La 2-2x B 1+2x Mn 2 O 7 where B = Ca or Sr) behave analogously to the n=∞ manganites in the sense that they undergo an insulating-to metallic-like state (I-M) transition coupled to a ferromagnetic transition at temperatures around 120-140 K; besides, they present a large magnetoresistance in this temperature range [2]. However, the change in dimensionality and resulting pronounced cation dependence of the electronic properties can produce physical properties which contrast strongly with the perovskite systems [3][4][5][6].In the n=2 member La 2-2x Sr 1+2x Mn 2 O 7 an extremely rich variety of magnetic phases have been found as a function of the Sr-doping. One of the most interesting regions extends from x=0.3 to x=0.4 where ferromagnetic metals (FMM) are found. However, also within a so relatively narrow doping range several different kinds of arrangements of manganese ions spin occur. A common property is the presence of a 2D ferromagnetic ordering in each perovskite layer and between the MnO 2 layers even though with different spin directions as a function of x. At x=0.3, the magnetic moments of each MnO 2 layer couple ferromagnetically within a bilayer and antiferromagnetically, along the c-axis, between successive bilayers. At x≈0.32 the inter-bilayer coupling becomes FM but still directed along the c-axis.At x≥0.33 the magnetic moments direct along the ab-plane. The magnetic coupling between the constituents single MnO 2 layers changes from FM into canted-antiferromagnetic (AFM) beyond x~0.4 [7]. Also the magnetic coupling above the transition temperature (T C ) is rather interesting. As suggested by several gro...

show abstract

Relation between Crystal and Magnetic Structures of Layered Manganite La_2-2xSr_1+2xMn₂O₇(0.30≤x≤0.50)

Cited by 129 publications

References 25 publications

Transient differential reflectivity of ferromagnetic and paramagnetic phases in the bilayered manganite La1.24Sr1.76Mn2O7

Transient differential reflectivity of ferromagnetic and paramagnetic phases in the bilayered manganite La1.24Sr1.76Mn2O7

Structural and magnetic properties of layered perovskite manganite LaCaBiMn₂O₇

Absence of Long-Range Magnetic Order in the La_1.4Sr_0.8Ca_0.8Mn₂O₇ Bilayered Manganite

Contact Info

Product

Resources

About

Relation between Crystal and Magnetic Structures of Layered Manganite La2-2xSr1+2xMn2O7(0.30≤x≤0.50)

Cited by 129 publications

References 25 publications

Transient differential reflectivity of ferromagnetic and paramagnetic phases in the bilayered manganite La1.24Sr1.76Mn2O7

Transient differential reflectivity of ferromagnetic and paramagnetic phases in the bilayered manganite La1.24Sr1.76Mn2O7

Structural and magnetic properties of layered perovskite manganite LaCaBiMn2O7

Absence of Long-Range Magnetic Order in the La1.4Sr0.8Ca0.8Mn2O7 Bilayered Manganite

Contact Info

Product

Resources

About

Relation between Crystal and Magnetic Structures of Layered Manganite La_2-2xSr_1+2xMn₂O₇(0.30≤x≤0.50)

Structural and magnetic properties of layered perovskite manganite LaCaBiMn₂O₇

Absence of Long-Range Magnetic Order in the La_1.4Sr_0.8Ca_0.8Mn₂O₇ Bilayered Manganite