Structure of the single-phase high-temperature superconductor YBa2Cu3O7−δ

Beno, M. A.; Soderholm, L.; Capone, D. W.; Hinks, D. G.; Jorgensen, J. D.; Grace, J. D.; Schuller, Iván K.; Segre, C. U.; Zhang, Kuilin

doi:10.1063/1.98886

Cited by 665 publications

(98 citation statements)

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“…A small amount of BaCuO 2 (<1%) as a main impurity phase as well as very weak lines, which could be assigned to unreacted BaO and Y203, were detected. The lattice parameters determined by neutron measurements are a = 3.8235(1)/~, b = 3.8858(1)A and c ---11.6762(6)A, in good agreement with previous work [5][6]. Highly ordered oxygen vacancies in a peculiar structure were confirmed.…”

Section: Sample Preparation and Characterizationsupporting

confidence: 78%

PHYSICAL PROPERTIES OF SINGLE-PHASE HIGH-Tc SUPERCONDUCTOR YBa2Cu3O7

KADOWAKI¹,

SPRANG²,

HUANG³

et al. 1987

Proceedings of the Yamada Conference XVIII on Superconductivity in Highly Correlated Fermion Systems

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Transport and thermodynamical properties as well as structural investigations in the well-characterized 90 K-class high-T~ superconductor YBa2Cu307 are presented, especially in relation to the fundamental mechanism of the high-T~ superconductivity. High-precision specific heat measurements around T~ =91.8K reveal that the value of AC/T c is 48 _+ 2 mJ/mol K 2. This value results in the fact that the value of AC/yT~ is 1.33, which is close to 1.43, the weak-coupling BCS value, provided that the coefficient, y, of the linear term in the specific heat is 36 -+ 2 mJ/mol K 2.

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Section: Sample Preparation and Characterizationsupporting

confidence: 78%

PHYSICAL PROPERTIES OF SINGLE-PHASE HIGH-Tc SUPERCONDUCTOR YBa2Cu3O7

KADOWAKI¹,

SPRANG²,

HUANG³

et al. 1987

Proceedings of the Yamada Conference XVIII on Superconductivity in Highly Correlated Fermion Systems

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“…The a-axis lattice constant is around 0.381 nm in the mixture of a and c-axes oriented grains and in the pure optimized [100]-orientation. This value may be compared to 0.382 nm of bulk material [22] . Similar to c, also a increases at low T 8 • A value of 0.384 nm at Ts of 650°C indicates deviations from stoichiometry in accordance with the observed disruptions of the superconducting properties.…”

Section: 1mentioning

confidence: 99%

“…The vibration amplitudes are averaged for contributions ofthe atoms in the string using values of0.083 A for Ba, 0.076 A for Y, an averaged value of 0.067 A for Cu(l) and Cu (2) and an averaged value of 0.088 A for the oxygen atoms on various positions. These values are taken from high resolution neutron diffraction measurements [22]. From Fig.…”

Section: Analysis Conceptsmentioning

confidence: 99%

Epitaxial growth and properties of YBaCuO thin films

Geerk

Linker

Meyer

1989

Materials Science Reports

180

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The growth quality ofYBaCuO thin films deposited by sputtering on different substrates (AlzOs, MgO, SrTiOs, Zr(Y)Oz) has been studied by X-ray diffraction and channeling experiments as a function ofthe deposition temperature. Besides the substrate orientation, the substrate temperature is the parameter determining whether films grow in c-, a-, (110) or mixed directions. Epitaxial growth correlates with high critical current values in the films ofup to 5.5 x 106 AJcm2 at 77 K. Ultrathin films with thicknesses down to 2 nm were grown revealing threedimensional superconducting behaviour. Films on (100) SrTiOs of9 nm thickness and below are partially strained indicating commensurate growth. From the analysis of the surface disorder 1 displaced Ba atom per Baz Y row was obtained indicating that the disordered layer thickness is about 0.6 nm. Tunnel junctions fabricated on these films reveal gap-like structures near ±16m V and ±30m V.Epitaktisches Wachsturn und Eigenschaften dünner Schichten des Hochtemperatur-Supraleiters YBaCuO ZUSAMMENFASSUNG Das Verfahren der Magnetron-Kathodenzerstäubung wurde zur Abscheidung dünner YBaCuO-Schichten auf verschiedenen Substraten (AlzOs, MgO, SrTiOs, Zr(Y)Oz) optimiert. Die Wachstumsrichtung und die kristalline Güte der Schichten wurde in Abhängigkeit von der Substrat-Oberflächengüte, der Orientierung und der Temperatur mittels Ionenchanneling und Röntgendiffraktion untersucht. Der Grad der Epitaxie und die Mosaik-Verbreiterung bestimmen den kritischen Transportstrom mit Werten bis zu 5.5 ·106 Ä/cm2 bei 77 K. Selbst in ultradünnen Schichten mit einer minimalen Dicke von bis zu 2 nm zeigt das supraleitende Verhalten 3-dimensionalen Charakter. Schichten auf (100) SrTiOs mit Dicken kleiner etwa 9 nm sind teilweise zur Unterlage verspannt, was auf kommensurables Wachstum hinweist. Die Channeling-Analyse der Schichtoberfläche ergibt in günstigen Fällen eine Verlagerung von nur 1 Ba-Atom pro Baz YKette, was einer maximalen Dicke der gestörten Oberfläche von etwa 0.6 nm entspricht. Auf diesen Schichten präparierte Tunneldioden zeigen Strukturen mit einer Energielücke inderNähe von ±16m V und ±30m V.--I --

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“…This leads to an orthorhombic structure of Pmmra space group with parameters a o -0. 3823 nm, b 0= 0.3886 nm, c 0= 1.1681 nm [27], actually shown in Fig. 2.…”

Section: Structures and Microstructuresmentioning

confidence: 99%