Dynamic variation of biaxial strain in optimally doped and underdoped YBa2Cu3O7−δ thin films

Pahlke, Patrick; Trommler, Sascha; Holzäpfel, B.; Schultz, L.; Hühne, Ruben

doi:10.1063/1.4797493

Cited by 14 publications

(14 citation statements)

References 31 publications

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“…We assume that the YBCO lattice is compressed in-plane on macroscopic scale in films with d ≤ 2.8 μm, resulting in a larger c-axis. This could partially explain the higher T c observed in thinner films (see Section III-D), as a compressive in-plane strain in YBCO enhances T c [9]. It should be noticed that a non-optimal oxygenation in thicker films would lead to a larger c-axis instead [10], which is not observed for our samples.…”

Section: B Structural Analysismentioning

confidence: 57%

Thick High <inline-formula> <tex-math notation="LaTeX">$J_\mathrm{c} $</tex-math></inline-formula> YBCO Films on ABAD-YSZ Templates

Pahlke

Hering²,

Sieger³

et al. 2015

IEEE Trans. Appl. Supercond.

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In this paper, we report on high critical current density (J c ) YBCO films deposited by pulsed laser deposition on CeO 2 buffered ABAD-YSZ/stainless steel templates with a thickness ranging from 0.7 μm up to 4.2 μm. In the thinnest sample, a transition temperature (T c ) of 90 K and a critical current density of 2.6 MA/cm 2 was reached at 77 K. With increasing thickness, T c drops as well as J c . The total critical current (I c ) increases strongly up to a thickness of 2.8 μm, reaching a value of almost 600 A/cm-width. In thicker films, no further increase in I c was observed. A higher surface roughness and misoriented YBCO grains were found in layer thicknesses above 2.8 μm and are assumed to be the main reason for the limitation of the current transport.

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Section: B Structural Analysismentioning

confidence: 57%

Thick High <inline-formula> <tex-math notation="LaTeX">$J_\mathrm{c} $</tex-math></inline-formula> YBCO Films on ABAD-YSZ Templates

Pahlke

Hering²,

Sieger³

et al. 2015

IEEE Trans. Appl. Supercond.

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“…This is an important feature for measurements in the region above the temperature of liquid nitrogen (i.e. 77 K) as for example used in studies of the strain dependence of the superconducting transition in optimally doped YBCO [7]. A significant reduction of was found for lower temperatures down to 10 K / 300 K 0.1 leading to a strain value of about 0.01% per 10 kV/cm.…”

Section: Resultsmentioning

confidence: 88%

“…These films show a direct correlation between magnetic moment and applied strain, a shift of the ferromagnetic ordering temperature and giant gauge effects [2][3][4][5]. We used these single crystals for the investigation of strain driven effects on thin film superconductors [6][7][8]. These measurements are performed at low temperatures and therefore it is an important requirement to know the effective strain value for this temperature region in order to correlate changes in the electronic properties to the structural parameters.…”

Section: Introductionmentioning

confidence: 98%

Low temperature performance of Pb(Mg<inf>1/3</inf>Nb<inf>2/3</inf>)<inf>0.72</inf>Ti<inf>0.28</inf>O<inf>3</inf> single crystals mapped by metallic and superconducting thin films

Hühne

Trommler

Pahlke

et al. 2014

2014 Joint IEEE International Symposium on the Applications of Ferroelectric, International Workshop on Acoustic Transduction M

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Pulsed laser deposition was used for the preparation of thin meander shaped platinum strain gauges on piezoelectric single crystalline (001) Pb(Mg 1/3 Nb 2/3 ) 0.72 Ti 0.28 O 3 substrates to study in-situ the temperature dependence of the applied strain in thin films even for small samples. A strong decrease of the strain with temperature was revealed at constant electric fields with a plateau like behavior for temperatures in the range of 100 K. The electrical field induced strain leads to a shift in the superconducting transition temperature of La 1.85 Sr 0.15 CuO 4 . A detailed study of the transition was used to prove a linear and reversible behavior of the strain with the applied electric field.PMN-PT, strain, low temperature behaviour, strain gauge

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“…34. In particular, the samples were annealed at a defined time and temperature in a flowing O 2 /N 2 gas mixture.…”

Section: Methodsmentioning

confidence: 99%

Controlling the near-surface superfluid density in underdoped YBa2Cu3O6+x by photo-illumination

Stilp

Suter

Prokscha

et al. 2014

Sci Rep

Self Cite

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The interaction with light weakens the superconducting ground state in classical superconductors. The situation in cuprate superconductors is more complicated: illumination increases the charge carrier density, a photo-induced effect that persists below room temperature. Furthermore, systematic investigations in underdoped YBa2Cu3O6+x (YBCO) have shown an enhanced critical temperature Tc. Until now, studies of photo-persistent conductivity (PPC) have been limited to investigations of structural and transport properties, as well as the onset of superconductivity. Here we show how changes in the magnetic screening profile of YBCO in the Meissner state due to PPC can be determined on a nanometer scale utilizing low-energy muons. The data obtained reveal a strongly increased superfluid density within the first few tens of nanometers from the sample surface. Our findings suggest a non-trivial modification of the near-surface band structure and give direct evidence that the superfluid density of YBCO can be controlled by light illumination.

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Dynamic variation of biaxial strain in optimally doped and underdoped YBa2Cu3O7−δ thin films

Cited by 14 publications

References 31 publications

Thick High <inline-formula> <tex-math notation="LaTeX">$J_\mathrm{c} $</tex-math></inline-formula> YBCO Films on ABAD-YSZ Templates

Thick High <inline-formula> <tex-math notation="LaTeX">$J_\mathrm{c} $</tex-math></inline-formula> YBCO Films on ABAD-YSZ Templates

Low temperature performance of Pb(Mg<inf>1/3</inf>Nb<inf>2/3</inf>)<inf>0.72</inf>Ti<inf>0.28</inf>O<inf>3</inf> single crystals mapped by metallic and superconducting thin films

Controlling the near-surface superfluid density in underdoped YBa2Cu3O6+x by photo-illumination

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