Spin transition and thermal expansion in the layered cobaltite GdBaCo2O5.5

Zhdanov, K. R.; Kameneva, M. Yu.; Козеева, Л. П.; Лавров, А. Н.

doi:10.1134/s1063783410080196

Cited by 14 publications

(11 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of splitting in the diffraction profile of (040), (020), and (002) peaks is evident for δ = 0.54(1) and δ = 0.57(1) in a narrow T range ( ∼7-8 K) below T IM ≈ 365 K [1][2][3][4][5] as shown in Fig. 1.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 83%

“…4 It should be noted that an e g electron hopping from an ISCo 3+ oct to the next ISCo 3+ oct along the a and c axes and/or to the next ISCo 3+ pyr along the b axis generates, in any case, a couple of LSCo 4+ and HSCo 2+ stable species. For example, the electron transfer along the b axis from Co pyr to Co oct and vice versa can be sketched as t 5 2g e 1 g − ISCo 3+ pyr + t 5 2g e 1 g − ISCo 3+ oct → t 5 2g e 0 g − LSCo 4+ pyr + t 5 2g e 2 g − HSCo 2+ oct (Fig. 5).…”

Section: Discussionmentioning

confidence: 99%

“…Such behavior is clearly demonstrated by the temperatureinduced insulator-to-metal transition (IMT) found at T IM ≈ 365 K with GdBaCo 2 O 5+δ when δ ≈ 0.5. [1][2][3][4][5] However, despite a number of experimental and theoretical studies in layered cobaltites, great controversy has arisen regarding the Co spin state and the microscopic origin of IMT. In the year 2000, Moritomo et al 6 suggested that the IMT is induced by a spin-state transition (SST) from an orbital-ordered (OO) IS state to the HS state in both Co pyr and Co oct sites, basing their consideration on neutron powder diffraction of TbBaCo 2 O 5.5 .…”

Section: Introductionmentioning

confidence: 99%

“…In strong contrast with SST, a muon-spin relaxation study on LnBaCo 2 O 5+δ δ ≈ 0.5 suggested that the HS state of Co 3+ is retained at T < 300 K. 9 Recently thermal expansion measurements on GdBaCo 2 O 5.5 confirmed the SST as the driving force for IMT excluding the occurrence of stepwise SST at lower temperatures. 5 Another model based on density functional theory calculations 10 and supported by photoemission 11 and isotope-effect neutron diffraction data 12 suggested that the IMT is due to hole delocalization in the Co 3+ HS state rather than to SST. 10,12 In this paper we present a EPR study on GdBaCo 2 O 5+δ combined with synchrotron XRPD as a function of δ and of the temperature across the IM transition.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Spin-lattice interaction in the insulator-to-metal transition of GdBaCo2O5+δ

et al. 2011

View full text Add to dashboard Cite

We use electron paramagnetic resonance spectroscopy (EPR) and synchrotron radiation x-ray powder diffraction to study the temperature-induced insulator-to-metal transition (IMT) for GdBaCo 2 O 5+δ samples in the δ range 0.54(1) δ 0.63(1). The EPR linewidth markedly changes across IMT and its temperature evolution can be explained considering spin state transition involving Co ions. The temperature dependences of the EPR linewidth and of the a lattice parameter fairly overlap each other suggesting spin-lattice interaction along the same crystallographic direction of the reported Ising-like spin anisotropy [A. A. Taskin et al., Phys. Rev. Lett. 90, 227201 (2003)]. A possible mechanism describing the interplay between this strong spin-lattice interaction and IMT is proposed.

show abstract

Section: Experimental Procedures and Resultsmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spin-lattice interaction in the insulator-to-metal transition of GdBaCo2O5+δ

et al. 2011

View full text Add to dashboard Cite

show abstract

“…In addition, cobalt oxides are promising materials for the production of solid state fuel cells and magnetoresistive and superconducting elements and as catalysts [4].…”

Section: Introductionmentioning

confidence: 99%

Suppression of the antiferromagnetic state in La0.82Ba0.18CoO3 cobaltite at high pressure

et al. 2015

View full text Add to dashboard Cite

A tutorial review on solid oxide fuel cells: fundamentals, materials, and applications

Sikstrom,

Thangadurai

2024

Ionics

View full text Add to dashboard Cite

Solid oxide fuel cells (SOFCs) are recognized as a clean energy source that, unlike internal combustion engines, produces no CO2 during operation when H2 is used as a fuel. They use a highly efficient chemical-to-electrical energy conversion process to convert oxygen and hydrogen into electricity and water. They can provide smaller-scale power for transportation (e.g., cars, buses, and ships) and be scaled up to provide long-term energy for an electrical grid, making SOFCs a promising, clean alternative to hydrocarbon combustion. Conventional SOFCs faced challenges of high operating temperatures, high cost, and poor durability. Research into advanced cathode, anode, electrolyte, and interconnect materials is providing more insight into the ideal structural and chemical properties that enable the commercialization of highly stable and efficient intermediate temperature (IT) SOFCs. In this paper, we discuss the functional properties of the cathode, anode, electrolyte, and interconnectors for IT-SOFCs. The performance of SOFCs depends not only on the materials used but also on the optimization of operating conditions to maximize efficiency. The voltaic, thermodynamic, and fuel efficiency of SOFCs is presented.

show abstract

Spin transition and thermal expansion in the layered cobaltite GdBaCo2O5.5

Cited by 14 publications

References 20 publications

Spin-lattice interaction in the insulator-to-metal transition of GdBaCo2O5+δ

Spin-lattice interaction in the insulator-to-metal transition of GdBaCo2O5+δ

Suppression of the antiferromagnetic state in La0.82Ba0.18CoO3 cobaltite at high pressure

A tutorial review on solid oxide fuel cells: fundamentals, materials, and applications

Contact Info

Product

Resources

About