Influence of oxygen disorder on the magnetic properties of LaBaCuFeO5+δ: an EXAFS and neutron diffraction study

Mombrú, Álvaro W.; Pardo, Helena; Suescun, Leopoldo; Toby, Brian H.; Ortiz, W.A.; Negreira, Carlos; Araújo‐Moreira, F. M.

doi:10.1016/s0921-4534(01)00148-4

Cited by 9 publications

(7 citation statements)

References 30 publications

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“…This would explain why this triple cell is not observed in the related compound LaBaCuFeO 5 . 11,12 The probability that different spin states for both possible oxidation states in Co coexist in LaBCCO, could be the reason for the better fit in this double-site triplecell model.…”

Section: Resultsmentioning

confidence: 97%

“…[4][5][6][7][8][9][10] The RBaCuFeO 5 system ͑RBCFO͒ has shown very interesting magnetic properties, dependent on the rare earth ͑RE͒ atom size. [11][12][13][14][15][16] Thus, incommensurate and commensurate antiferromagnetic superstructures have been reported for YBCFO and for TmBCFO and LuBCFO, respectively. At the other extreme, LaBCFO showed a body centered orthogonal structure-a pseudocubic model-with the same occupation site for lanthanum and barium that yielded a magnetic structure differing from the other members of the series.…”

Section: Introductionmentioning

confidence: 98%

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Structural and magnetic study ofLaBaCoCuO5+δ

et al. 2005

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The structure and magnetic properties of the compound LaBaCuCoO 5+␦ have been studied for the nonstoichiometric oxygen concentration ␦ Ϸ 0.6. The structure is pseudo-cubic with a tripled perovskite unit cell.The crystal structure was determined by a combined Rietveld fit to neutron and synchrotron x-ray powder diffraction data in the orthorhombic Pmmm space group, with cell parameters a = 3.9223͑3͒ Å, b = 3.9360͑3͒ Å, c = 11.7073͑8͒ Å, and V = 180.74͑2͒ Å 3 ͑room temperature͒. Antiferromagnetic ordering of Cu and Co magnetic moments is observed below 205͑4͒ K. The magnetic structure with cell a M =2a, b M =2b, and c M =2c, could be described with the Shubnikov space group FmmmЈ. The magnetic moments of both equivalent Cu/ Co sites were determined at 50 and 170 K to be 0.83͑3͒ B and 0.58͑3͒ B , respectively, consistent with one unpaired electron per atom. The fit of the intensities to a simple mean field magnetic model appeared to be insufficient to account for the variation of moments at temperatures close to T N while a three dimensional Heisenberg model could improve the fit. Susceptibility measurements between 4 and 350 K also show irreversibility below 150 K. The local environments of Cu and Co were studied by extended x-ray absorption fine structure spectroscopy at both absorption edges. Cu atoms adopt an elongated octahedral or square-based pyramidal oxygen environment which suggests mainly the presence of Cu͑II͒ in the structure. Co adopts different local environments, depending on the electronic and spin states.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Structural and magnetic study ofLaBaCoCuO5+δ

et al. 2005

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“…As AFM coupling is prevalent between the bipyramid units and the FM coupling within the bipyramids, it leads to the magnetic frustration. The competition between the FM and AFM interactions, and enhanced value of FM interactions in LaBaCuFeO 5 , leads to the increase in the magnetic irreversibility between the ZFC and FC data 25 . This compound shows significant change in dielectric constant with temperature along with glassy electric-dipole dynamics.…”

Section: Discussionmentioning

confidence: 99%

Effect of (Cu/Fe)O5 bipyramid size and separation on magnetic and dielectric properties of rare earth layered perovskite LaBaCuFeO5 and LuBaCuFeO5

Lal

Yadav

Mukherjee

2019

Journal of Applied Physics

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We report structural, magnetic and dielectric properties of layered perovskite materials LnBaCuFeO 5 (Ln = La and Lu). LaBaCuFeO 5 shows magnetic cluster glass behavior below 60 K owing to the competing ferromagnetic and antiferromagnetic exchange interactions. Glassy dynamics of electric dipoles has also been observed in the vicinity of the magnetic glass transition temperature. The presence of significant coupling between spin and polar degrees of freedom results in the multiglass feature in LaBaCuFeO 5 . The LuBaCuFeO 5 compound undergoes YBaCuFeO 5 like commensurate to incommensurate antiferromagnetic transition at 175 K. Large magnetic irreversibility below 17 K in this compound suggests the presence of strong spin anisotropy. In addition, in this compound the interaction between the dipoles is not strong enough, which results in the absence of glassy dynamics of electric dipoles. The contrasting behavior of two compounds is possibly due to variation in the ferromagnetic and antiferromagnetic interactions along c-axis, which is the manifestation of structural modification arising out of the difference in the ionic radii of La and Lu.

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“…In such compounds, two layers of M'O 5 and M"O 5 are present and it is possible to combine different types of metal element in an ordered or disordered network. Also depending upon the size of rare-earth ions, these compounds have the various interesting physical properties [4][5][6][7]. YBaCuFeO 5 is quite interesting, as it exhibits magnetic and dielectric transitions above ~ 200 K [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of doping of Co, Ni and Ga on magnetic and dielectric properties of layered perovskite multiferroic YBaCuFeO5

Lal

Yadav

Mukherjee

2020

Journal of Magnetism and Magnetic Materials

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YBaCuFeO 5 is one of the interesting multiferroic compounds, which exhibits magnetic ordering and dielectric anomaly above 200 K. Partial substitution of Fe with other magnetic and non-magnetic ion affects the magnetic and the structural properties of the system. We report detailed investigation of structural, magnetic and dielectric properties of YBaCuFe 0.85 M 0.15 O 5 (M=Co, Ni and Ga). We observed that the partial replacement of Ni and Co in place of Fe, results in magnetic dilution and broadening of the magnetic transition and shifting towards lower temperature. The replacement of Fe with non-magnetic Ga also results in shifting of the magnetic transition to the lower temperature side. The observed dielectric relaxation behavior in these compounds is due to the charge carrier hoping. This study highlights the impacts of magnetic and non-magnetic doping at the magnetic site on magnetic and dielectric properties in layered perovskite compound YBaCuFeO 5 .

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Influence of oxygen disorder on the magnetic properties of LaBaCuFeO5+δ: an EXAFS and neutron diffraction study

Cited by 9 publications

References 30 publications

Structural and magnetic study ofLaBaCoCuO5+δ

Structural and magnetic study ofLaBaCoCuO5+δ

Effect of (Cu/Fe)O5 bipyramid size and separation on magnetic and dielectric properties of rare earth layered perovskite LaBaCuFeO5 and LuBaCuFeO5

Effect of doping of Co, Ni and Ga on magnetic and dielectric properties of layered perovskite multiferroic YBaCuFeO5

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