Synthesis, structure, and superconductivity of single crystals of high-Tc La1.85Sr0.15CuO4, a lanthanum strontium copper oxide

Wang, H.H.; Geiser, U.; Thorn, R. J.; Carlson, K. Douglas; Beno,; Monaghan, M. R.; Allen, Thomas J.; Proksch, Roger; Stupka, D. L.; Kwok, W. K.; Crabtree, G. W.

doi:10.1021/ic00255a002

Cited by 50 publications

(8 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This feature of the local coordination of lanthanum and strontium ions, which is related to different radii of these particles, is observed for all the compositions investigated. It is noteworthy that, with an increase in the strontium concentration, the half-width of peaks of the functions g LaO1 (r) and g SrO1 (r) increase for a number of [29]. It can be seen in Fig.…”

Section: Results Of the Computation Of Thementioning

confidence: 75%

10.1007/s11445-008-2019-x

2010

CrossRef Listing of Deleted DOIs

View full text Add to dashboard Cite

The processes of oxygen diffusion in La 2 -x Sr x CuO 4 -δ phases have been simulated for the first time by the molecular-dynamics method. Calculations were performed for the temperature range 300-2500 K. The behavior of the radial pair correlation functions, which characterize the degree of order of O1 ions in CuO 2 layers, indicates that O 2anions form a weakly correlated subsystem within a CuO 2 layer. To quantitatively confirm the conclusions about the predominantly two-dimensional character of ion transport and different mobilities of O1 and O2 particles in the cuprates under study, the pair oxygen diffusion coefficients in the La 2 − x Sr x CuO 4 -δ lattice were calculated. It is shown that oxygen diffusion occurs through the conventional hopping mechanism mainly in CuO 2 layers; correspondingly, the diffusion coefficient for equatorial ions (O1) exceeds that for apical oxygen anions (O2) by an order of magnitude. The motion of oxygen anions was traced at the microscopic level through analysis of the particle transport trajectories. It has been proven for the first time that diffusion of O1 ions in the ab plane in a nonstoichiometric LaSrCuO 3.61 sample occurs through jumps to the nearest position or along CuO 2 layers; in a more complicated way, it may occur through unoccupied O2 lattice sites.

show abstract

Section: Results Of the Computation Of Thementioning

confidence: 75%

10.1007/s11445-008-2019-x

2010

CrossRef Listing of Deleted DOIs

View full text Add to dashboard Cite

show abstract

“…The Rietveld analysis [10] was performed with a FullProf program package [11]. The space groups I4/mmm and Cmce, as well as the atomic positions published for La 1.85 Sr 0.15 CuO 4 [12] and La 1.94 Sr 0.06 CuO 4 [13], were used in the refinement.…”

Section: Methodsmentioning

confidence: 99%

TSFZ Growth of Eu-Substituted Large-Size LSCO Crystals

et al. 2022

View full text Add to dashboard Cite

The travelling solvent floating zone (TSFZ) growth of Eu-substituted LSCO (La1.81−xEuxSr0.19CuO4, with nominal x = 0 ÷ 0.4) single crystals was systematically explored for the first time. The substitution of La with Eu considerably decreased the decomposition temperature. Optimal growth parameters were found to be: oxygen pressure 9.0–9.5 bars; Eu-free CuO-poor solvent (66 mol% CuO) with a molar ratio of La2O3:SrCO3:CuO = 4:4.5:16.5 and growth rate 0.6 mm/hour. The obtained single crystals were characterized with optical polarized microscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy analysis. The solubility of Eu in LSCO appeared to be limited to x~0.36–0.38 under the used conditions. The substitution of La3+ with smaller Eu3+ ions led to a structural transition from tetragonal with space group I4/mmm for La1.81Sr0.19CuO4 (x = 0) to orthorhombic with space group Fmmm for La1.81−xSr0.19EuxCuO4 (x = 0.2, 0.3, 0.4), and to a substantial shrinking of the c-axis from 13.2446 Å (x = 0.0) to 13.1257 Å (x = 0.4). Such structural changes were accompanied by a dramatic decrease in the superconducting critical temperature, Tc, from 29.5 K for x = 0 to 13.8 K for 0.2. For x ≥ 0.3, no superconductivity was detected down to 4 K.

show abstract

“…(1) the original 40 K superconductors La 2 - x M x CuO 4 in which the conducting skeleton consists of a single Cu−O plane; , …”

Section: Other Types Of Inorganic Superconductorsmentioning

confidence: 99%

“…(2) the 90 K “123” superconductor ,− YBa 2 Cu 3 O 7 and the 81 K “124” superconductor YBa 2 Cu 4 O 8 in which the conducting skeletons consist of two Cu−O planes braced by single or double Cu−O chains, respectively;…”

Section: Other Types Of Inorganic Superconductorsmentioning

confidence: 99%

Chemical Structure and Superconductivity

King

1998

J. Chem. Inf. Comput. Sci.

View full text Add to dashboard Cite

Consideration of the chemical bonding topology of the conducting skeletons in the Chevrel phases MMo6S8 and the lanthanide rhodium borides LnRh4B4 indicates that the conducting skeletons consist of networks of edge-localized bonded atoms. These observations suggest that superconductivity is favored when electron mobility is restricted to fewer than three dimensions. Thus, the chemical bonding topologies of the highest T c superconductors contain one of the following features: (1) edge-localized M−M bonding in the conducting skeletons of ternary and quaternary solid-state superconductors or related, partially localized bonding in superconducting transition metals and their alloys; (2) localized rather than fully delocalized bonding in copper oxide superconductors containing Cu−O−Cu linkages with appreciable Cu···Cu antiferromagnetic interactions; or (3) surface-localized bonding in fullerene superconductors containing direct C−C bonds such as K3C60. In addition, heavy fermion superconductors with considerably lower T cs values are known in which the conducting skeleton consists of variable oxidation state lanthanide or actinide cations diluted by an anionic network of other metal atoms so that the lanthanide or actinide atoms are not within bonding distance of each other.

show abstract

Synthesis, structure, and superconductivity of single crystals of high-Tc La1.85Sr0.15CuO4, a lanthanum strontium copper oxide

Cited by 50 publications

References 2 publications

10.1007/s11445-008-2019-x

10.1007/s11445-008-2019-x

TSFZ Growth of Eu-Substituted Large-Size LSCO Crystals

Chemical Structure and Superconductivity

Contact Info

Product

Resources

About