Reentrant paramagnetic behavior and spin-state transition in the layered cobalt oxide GdBaCo 2 O 5+δ

Kim, W.S.; Chi, E.O.; Choi, Hongseok; Hur, Nam Hwi; Oh, Sangjun; Ri, H.-C.

doi:10.1016/s0038-1098(00)00385-9

Cited by 56 publications

(30 citation statements)

References 25 publications

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“…6b), consistent with the MI transition. A number of mechanisms have been proposed for the MI transition [8,[14][15][16][17], and not all of these can be distinguished through photoemission. However, the very gradual changes observed in the spectra as a function of temperature, particularly in the region of 2 eV binding energy (a region associated with the Co(III) low spin (LS, S=0) state [13]), suggest that the transition does not occur via a sudden change from LS to the high spin (HS, S ¼ 2) spin switch as proposed by Frontera et al [14].…”

Section: High-resolution and Resonant Photoemission Ofmentioning

confidence: 99%

Large single crystals of LnBaCo2O5.5: Initial nucleation, growth and study

Barilo¹,

Shiryaev²,

Бычков³

et al. 2008

Journal of Crystal Growth

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Section: High-resolution and Resonant Photoemission Ofmentioning

confidence: 99%

Large single crystals of LnBaCo2O5.5: Initial nucleation, growth and study

Barilo¹,

Shiryaev²,

Бычков³

et al. 2008

Journal of Crystal Growth

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“…The mechanism of such magnetic transformations at low temperatures is still not properly understood. It is also not clear why subtle changes in oxygen content should cause drastic changes in magnetic properties [16,17]. On the basis of neutron diffraction [13,[18][19][20] with different types of antiferromagnetic SSO [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of oxygen content on magnetic properties of layered cobaltites PrBaCo2O5+δ

Ganorkar

Priolkar

Sarode

et al. 2011

Journal of Applied Physics

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The effect of oxygen content on the magnetic properties of the layered perovskites has been investigated. The samples, PrBaCo 2 O 5+δ (0.35 ≤ δ ≤ 0.80) were prepared by sol-gel method and characterized by X-ray diffraction and DC magnetization. A detailed magnetic phase diagram for PrBaCo 2 O 5+δ is presented. It is found that unlike in the case of heavier rare-earths, ferromagnetic interactions are present at all temperatures below Tc and even in the antiferromagnetically ordered phase. Moreover, in compounds with lower oxygen content, short range ferromagnetic interactions are present even above Tc. This dependence of magnetic properties on oxygen content in these layered perovskites has been linked to the changes in polyhedra around the Co ions.

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“…Recently, cobalt oxides attract much attention due to their unique magnetic behaviors and various spin state [1][2][3], low spin state, intermediate spin state and high spin state. Their magnetic and transport properties have been interpreted on the basis of the spin states of Co 3þ , Co 4þ and Co 2þ ions.…”

Section: Introductionmentioning

confidence: 99%

“…Suggested that the occupied e g orbital ordering was assumed to alternate, the corresponding ordered intermediate spin state was taken as consisting of ferromagnetic plane with an antiferromagnetic coupling between planes. The cobaltates RBaCo 2 O 5Àd can have Co-O octahedron, square pyramid or both structures depending on oxygen content [1,3]. The unusual paramagnetic (PM) reentrance phenomenon occurring via a couple of spin-state transition was reported on the GdBaCo 2 O 5Àd compound [3].…”

Section: Introductionmentioning

confidence: 99%