2012
DOI: 10.1088/1367-2630/14/12/123025
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Spin-state order/disorder and metal–insulator transition in GdBaCo2O5.5: experimental determination of the underlying electronic structure

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Cited by 55 publications
(57 citation statements)
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“…(d) Thermal reflectivity difference with respect to the 300 K is displayed together with the laser-induced reflectivity (black dots). excitation of the system result in modifications of the intensity all over the edge, as expected from XAS data [15,32]. An increase of the intensity in the pre-edge region (∼529 eV) is observed for positive time delays in the pump-probe experiments and above 500 K upon static heating, as expected when metallization of the system takes place.…”
Section: Pump-probe Versus Temperature Reflectivitysupporting
confidence: 69%
See 1 more Smart Citation
“…(d) Thermal reflectivity difference with respect to the 300 K is displayed together with the laser-induced reflectivity (black dots). excitation of the system result in modifications of the intensity all over the edge, as expected from XAS data [15,32]. An increase of the intensity in the pre-edge region (∼529 eV) is observed for positive time delays in the pump-probe experiments and above 500 K upon static heating, as expected when metallization of the system takes place.…”
Section: Pump-probe Versus Temperature Reflectivitysupporting
confidence: 69%
“…Understanding the SMT of LCO with soft x-rays can be accomplished by studying the changes at the O K edge as extracted from XAS studies [15,32]. Changes in the intensity and position of all the features at the edge have been observed.…”
Section: Pump-probe Versus Temperature Reflectivitymentioning
confidence: 99%
“…Clearly, LaSrCoO 4 has its spectral features at energies that are lower than those of NdCaCoO 4 , which is similar to those of LaCoO 3 at 650 K when compared with LaCoO 3 at 20 K and EuCoO 3 . From earlier studies, we know that LaCoO 3 undergoes a gradual transition from LS to HS when going from 20 K to 650 K. 28,29 Therefore, the LaSrCoO 4 spectrum at 11 K provides direct evidence that LaSrCoO 4 is not in a pure Co 3+ LS state. Instead, it contains non-negligible amounts of Co 3+ ions in the HS state.…”
Section: Resultsmentioning
confidence: 94%
“…Pure Low-spin (LS) Co 3+ is well known, such as LiCoO 2 , NaCoO 2 , and EuCoO 3 , while pure high-spin (HS) Co 3+ exists only in systems with the relatively weak crystal field like YBa 2 Co 4 O 7 with CoO 4 tetrahedrons 23 and Sr 2 CoO 3 Cl with CoO 5 pyramids 24 . The HS Co 3+ with CoO 6 symmetry in cobalt oxides was only found in the system with a mixture of HS and LS like LaCoO 3 25 or in the system with oxygen deficiency such as GdBaCo 2 O 5.5 26 . Considering that Sr 2 IrO 4 has relatively large lattice parameters (Ir-O in-plane  = 1.9832 Å) 27 , it is expected that the Co 3+ ions doped in Sr 2 IrO 4 would be in a pure HS state owing to the weak crystal field.…”
Section: Introductionmentioning
confidence: 99%