Single crystal growth of HgBaCaCuO and infinite layer CaCuO2 at high gas pressure

Karpiński, J.; Mangelschots, I.; Schwer, H.; Conder, K.; Morawski, A.; Łada, T.; Paszewin, A.

doi:10.1016/0921-4534(94)91683-7

Cited by 19 publications

(19 citation statements)

References 3 publications

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“…The Bi2212 crystal was of size 1 × 2 mm 2 , grown by the travelling-solvent floating-zone method [38] with T c ∼ 87 K ( T c ∼ 1.2 K). On the other hand, the Hg-based crystals were of small size (∼0.3 × 0.3 mm 2 ), and were grown by a high-pressure synthesis technique [39]. The values of T c for the samples used for the present experiments were 94 K ( T c ∼ 2 K) and 116 K ( T c ∼ 3 K) respectively for the Hg1201 and Hg1212.…”

Section: Methodsmentioning

confidence: 99%

The stripe critical point for cuprates

Bianconi

Caprara

et al. 2000

J. Phys.: Condens. Matter

100

147

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The experimental determination of the quantum critical point (QCP) that triggers the self-organization of charged striped domains in cuprate perovskites is reported. The phase diagram of doped cuprate superconductors is determined by a first variable, the hole doping δ, and a second variable, the micro-strain ε of the Cu-O bond length, obtained from the Cu K-edge extended x-ray absorption fine structure. For a fixed optimum doping, δ c = 0.16, we show the presence of the QCP for the onset of local lattice distortions and stripe formation at the critical micro-strain ε c. The critical temperature T c (ε, δ) reaches its maximum at the quantum critical point (ε c , δ c) for the formation of bubbles of superconducting stripes. The critical charge, orbital and spin fluctuations near this strain QCP provide the interaction for the pairing.

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Section: Methodsmentioning

confidence: 99%

The stripe critical point for cuprates

Bianconi

Caprara

et al. 2000

J. Phys.: Condens. Matter

100

147

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“…In Table I the relative energies of the d-orbital excitations obtained from multireference calculations for IL-NdNiO 2 and isostructural IL-CaCuO 2 are shown (for structural details, see Refs. [16,28,29]). These are obtained from a cluster-in-an-embedding calculation.…”

Section: O Nimentioning

confidence: 99%

Electronic correlations and magnetic interactions in infinite-layer NdNiO2

et al. 2020

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The large antiferromagnetic exchange coupling in the parent high-Tc cuprate superconductors is believed to play a crucial role in pairing the superconducting carriers. The recent observation of superconductivity in hole-doped infinite-layer (IL-) NdNiO2 brings to the fore the relevance of magnetic coupling in high-Tc superconductors, particularly because no magnetic ordering is observed in the undoped IL-NdNiO2 unlike in parent copper oxides. Here, we investigate the electronic structure and the nature of magnetic exchange in IL-NdNiO2 using state-of-the-art many-body quantum chemistry methods. From a systematic comparison of the electronic and magnetic properties with isostructural cuprate IL-CaCuO2, we find that the on-site dynamical correlations are significantly stronger in IL-NdNiO2 compared to the cuprate analog. These dynamical correlations play a critical role in the magnetic exchange resulting in an unexpectedly large antiferromagnetic nearest neighbor isotropic J of 77 meV between the Ni 1+ ions within the ab-plane. While we find many similarities in the electronic structure between the nickelate and the cuprate, the role of electronic correlations is profoundly different in the two. We further discuss the implications of our findings in understanding the origin of superconductivity in nickelates.

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“…4. CaCuO of the IL-type was previously prepared at a high-Ar-gas pressure of 0.1 GPa (19). As pressure is further increased, a new phase appears at Ca/Cu&1/1.…”

Section: The Cao-cuo Systemmentioning

confidence: 99%