The distribution of the doped holes in La2−xSrxCu1−yRuyO4−δ

Hu, Z.; Golden, M. S.; Ebbinghaus, Stefan G.; Knupfer, M.; Fink, J.; Groot, Frank M. F. de; Kaindl, G.

doi:10.1016/s0301-0104(02)00729-2

Cited by 16 publications

(18 citation statements)

References 34 publications

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“…In contrast, a spectral shift at the Os-L3 edge of approximately 1.0(1) eV to higher energy from Sr2FeOsO6 to Ba2NiOsO6 indicates an increased valency of one from Os 5+ to Os 6+ in the latter. [47][48][49][50] The energy shift, the CFS, and the relative t2g and eg related spectral weights can be clearly discerned in the second derivative spectra at the bottom of the right inset in Figure 1. The eg related peak is shifted by 1.3(1) eV to higher energy in Ba2NiOsO6 relative to Sr2FeOsO6, and the spectral weight of the t2g related peak increases reflecting a smaller number of t2g holes 47 on Os 5+ (t2g 3 ) compared to Os 6+ (t2g 2 ).…”

Section: Resultsmentioning

confidence: 96%

Ba2NiOsO6 : A Dirac-Mott insulator with ferromagnetism near 100 K

et al. 2016

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The ferromagnetic semiconductor Ba2NiOsO6 (Tmag ~100 K) was synthesized at 6 GPa and 1500 C. It crystallizes into a double perovskite structure a = 8.0428 plays an essential role in opening the charge gap. The magnetic state was investigated by density functional theory calculations and powder neutron diffraction. The latter revealed a collinear ferromagnetic order in a >21 kOe magnetic field at 5 K. The ferromagnetic gapped state is fundamentally different from that of known dilute magnetic semiconductors such as (Ga,Mn)As and (Cd,Mn)Te (Tmag < 180 K), the spin-gapless semiconductor Mn2CoAl (Tmag ~720 K), and the ferromagnetic insulators EuO (Tmag ~70 K) and Bi3Cr3O11 (Tmag ~220 K). It is also qualitatively different from known ferrimagnetic insulator/semiconductors, which are characterized by an antiparallel spin arrangement. Our finding of the ferromagnetic semiconductivity of Ba2NiOsO6 should increase interest in the platinum group oxides, because this new class of materials should be useful in the development of spintronic, quantum magnetic, and related devices.3

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Section: Resultsmentioning

confidence: 96%

Ba2NiOsO6 : A Dirac-Mott insulator with ferromagnetism near 100 K

et al. 2016

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“…On the other hand, concerning Ru L-edge XAS spectra, the quantitative estimation of Ru valency from the detailed analysis of Ru L-edge XAS spectra on La 2−x Sr x Cu 1−y Ru y O 4−␦ have been reported. 18 According to this report, the main peak position and the intensity ratio between the doubled-peak structures derived from Ru 4d t 2g 17 are also shown as references of Mn 3+ and Mn 4+ , respectively. In order to consider only the spectral shapes and the relative energy shift, the both reference spectra are shown with shift of 2.8 eV to lower photon energy.…”

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confidence: 81%

Electronic structure ofSrRu1−xMnxO3studied by photoemission and x-ray absorption spectroscopy

et al. 2010

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In order to investigate the change in the electronic structure with Mn doping of SrRu 1−x Mn x O 3 ͑SRMO͒, we have performed soft x-ray synchrotron photoemission spectroscopy ͑PES͒ and x-ray absorption spectroscopy ͑XAS͒. In the soft x-ray PES spectra, the sharp peak structure near the Fermi level ͑E F ͒, which was clearly observed in SrRuO 3 , was suppressed accompanied with Mn doping in SRMO. In the Mn 2p XAS and Mn 2p-3d resonant PES spectra, we have confirmed the existence of Mn 3+ ions with the electron doping to Mn 3d e g states and Mn 3d partial density of state never have finite intensity at E F in SRMO. These results suggest that the metal-insulator transition of SRMO with Mn doping is originated from the charge transfer from the itinerant Ru 4d t 2g bands to the localized Mn 3d e g orbitals.Perovskite-type transition-metal oxides ͑TMOs͒ have attracted much attention because of their unique physical phenomena such as colossal magnetoresistance, percolation, phase separation, etc., resulting from the strongly correlated d-band electrons and hybridization between the transitionmetal d bands and O 2p bands. 1,2 The ruthenates, as a class of TMOs exhibit a wide variety of physical properties derived from the itinerant-localized duality of Ru 4d electrons. SrRuO 3 ͑SRO͒ is known well to be an itinerant ferromagnetic metal ͑FM͒ with the Curie temperature of around 160 K. The substitution of 3d-metal ions for the Ru ions causes the localization of d electrons, electronic disorders, and charge transfer between the Ru ions and 3d-metal ions. Correlations among these phenomena result in the various physical properties such as metal-insulator and magnetic transitions in 3d-doped SrRu 1−x M x O 3 ͑M = Ti, Cr, Mn, Fe, etc.͒ system. [3][4][5][6][7][8][9][10][11][12][13][14] The one of the most striking compounds in the system is14 The other end of SRMO compounds, SrMnO 3 ͑SMO͒ is an antiferromagnetic ͑AF͒ insulator, which is originated from localized Mn 3d t 2g electrons since SMO has only Mn 4+ ions which have no Mn 3d e g electrons. Many investigations for unusual physical properties in the intermediate compositions of SRMO system have been reported. 7-14 Cao et al. 7 reported on singlecrystalline samples of SRMO that the Mn doping suppresses the itinerant ferromagnetic phase, and then induces a new insulating phase above the critical point x c = 0.39. For x Ͼ x c , the temperature variations in the magnetic susceptibility suggest the appearance of AF order in the insulating phase. On the other hand, Sahu et al. 8 reported on the polycrystalline samples that the ferromagnetic state is still stable up to x = 0.5. They also mentioned the charge transfer between Ru and Mn ions from the results of x-ray absorption spectroscopy ͑XAS͒. Recently, Yokoyama et al. 9 found using powder neutron-diffraction measurements that the itinerant ferromagnetic order in SRO changes into the AF order with nearly localized d electrons in the intermediate Mnconcentration range between x = 0.4 and 0.6. Kolesnik et al. 12 states the existe...

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“…19 The shift to higher energies from Ca 3 FeRhO 6 to Ca 3 CoRhO 6 reflects the increase in the Rh valence from Rh 3+ to Rh 4+ as we can learn from previous studies on 4d transition-metal compounds. 24,25,26,27 Furthermore, for Ca 3 CoRhO 6 the spectrum shows a weak low-energy shoulder, which is weaker at the Rh-L 2 edge than at the Rh-L 3 edge. This shoulder can be attributed to transitions from the 2p core levels to the t 2g state, reflecting a 4d 5 configuration with one hole at the t 2g state.…”

Section: Xas and Valence Statementioning

confidence: 98%

X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6

Burnus,

Hu,

et al. 2008

Preprint

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Using x-ray absorption spectroscopy at the Rh-L2,3, Co-L2,3, and Fe-L2,3 edges, we find a valence state of Co 2+ /Rh 4+ in Ca3CoRhO6 and of Fe 3+ /Rh 3+ in Ca3FeRhO6. X-ray magnetic circular dichroism spectroscopy at the Co-L2,3 edge of Ca3CoRhO6 reveals a giant orbital moment of about 1.7µB , which can be attributed to the occupation of the minority-spin d0d2 orbital state of the highspin Co 2+ (3d 7 ) ions in trigonal prismatic coordination. This active role of the spin-orbit coupling explains the strong magnetocrystalline anisotropy and Ising-like magnetism of Ca3CoRhO6.

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The distribution of the doped holes in La2−xSrxCu1−yRuyO4−δ

Cited by 16 publications

References 34 publications

Ba2NiOsO6 : A Dirac-Mott insulator with ferromagnetism near 100 K

Ba2NiOsO6 : A Dirac-Mott insulator with ferromagnetism near 100 K

Electronic structure ofSrRu1−xMnxO3studied by photoemission and x-ray absorption spectroscopy

X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6

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