Increase in the superconducting transition temperature by anisotropic strain effect in (001) La1.85Sr0.15CuO4 thin films on LaSrAlO4 substrates

Sato, Hisashi; Naito, Makio

doi:10.1016/s0921-4534(96)00675-2

Cited by 189 publications

(151 citation statements)

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“…It is also known that epitaxial strain strongly affects T c in thin La 2-x Sr x CuO 4 films (2,(19)(20)(21). It is generally agreed that tensile strain (e.g., on SrTiO 3 substrates) tends to reduce T c while compressive strain (e.g., on LaSrAlO 4 like in the present study) tends to increase T c , although there has been some controversy about the precise enhancement mechanism and possible incorporation of interstitial oxygen (2,(19)(20)(21).…”

mentioning

confidence: 99%

Anomalous expansion of the copper-apical-oxygen distance in superconducting cuprate bilayers

Zhou

Yacoby

Butko

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

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Fig. 5. 2D electron density (ED) profiles along (100) and (110) atomic planes of the M-I bilayer system. The EDs were determined from the experimentally measured diffraction intensities using the COBRA technique. Cold colors represent low ED while warmer colors represent higher ED. Schematic crosssections of the complete tetragonal unit cell along each atomic plane are illustrated near the sides of the two respective panels. (Left) In (100) plane, the white lines highlight the projected shapes of the CuO 6 octahedra, in particular the elongation near the surface. (Right) In (110) plane, the white lines highlight the projected profiles of the La-apical O planes, in particular the corrugation near the surface.

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confidence: 99%

Anomalous expansion of the copper-apical-oxygen distance in superconducting cuprate bilayers

Zhou

Yacoby

Butko

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

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“…Enhancements in Tc (critical temperature) were observed in ferroelectric, [8] Submitted to ferromagnetic [9] and even superconducting materials. [10] Properties such as induced ferromagnetism and superconductivity have been observed due to broken symmetries at the interface [11] between a LaAlO3 substrate and a SrTiO3 film. Recently, strain-induced ferroelectric behavior has been observed in ca 10nm thick films of HfO2 [12] and Zr0.5Hf0.5O2 [13] on silicon.…”

Section: Introductionmentioning

confidence: 99%

Interesting Evidence for Template‐Induced Ferroelectric Behavior in Ultra‐Thin Titanium Dioxide Films Grown on (110) Neodymium Gallium Oxide Substrates

Deepak

Miguel

Keeney

et al. 2014

Adv Funct Materials

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This paper reports the first-ever presentation of evidence for room-temperature ferroelectric behavior in anatase-phase titanium dioxide (a-TiO2). It is shown that behaviour strongly indicative of ferroelectric behavior is induced in ultra-thin (20nm to 80nm) biaxially-strained epitaxial films of a-TiO2 deposited by liquid injection chemical vapour deposition onto (110) Submitted to neodymium gallium oxide (NGO) substrates. The structural properties of the films were analyzed by x-ray diffraction and high-resolution transmission electron microscopy, which showed significant orthorhombic strain in films. Possible ferroelectric behavior was probed by piezoresponse force microscopy (PFM). The films on NGO showed a switchable dielectric spontaneous polarization, the ability to retain polarization information written into the film using the PFM tip for extended periods (several hours) and at elevated temperatures (up to 100°C) without significant loss, and the disappearance of the polarization at a temperature between 180 and 200°C, indicative of a Curie temperature within this range. This combination of effects is believed to constitute strong experimental evidence for ferroelectric behavior, which has not hitherto been reported in a-TiO2 and opens up the possibility for a range of new devices and materials applications. A model is presented for the effects of large in-plane strains on the crystal structure of anatase which provides a possible explanation for the experimental observations.

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“…In the first case, the value of ∆k f lies in the interval [25,30], while in the second, it lies in [4,5] (see Fig. 7 (c) and (d)).…”

Section: Resultsmentioning

confidence: 93%

“…Among the many materials, which are currently studied, Sr 14−x Ca x Cu 24 O 41 [1,2] or (LaY ) y (SrCe) 14−y Cu 24 O 41 [3,4] show very anisotropic structures, and can be well represented by a single ladder. Indeed, unconventional superconductivity has been observed in these materials [5,6]; in particular, superconducting (SC) phases are found in the vicinity of antiferromagnetic ones, sometimes with a gapped phase in between [7].…”

Section: Introductionmentioning

confidence: 99%

Functional renormalization-group calculation of the Fermi surface of a spin ladder

Abramovici

Héritier

2007

Phys. Rev. B

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We study non conventional superconductivity on a ladder, improving the predictions of the Hubbard model. The determination of the Fermi surface, in 2 or 3 dimensions, remains a very hard task, but it is exactly solvable for a single ladder. We use functional Renormalisation Group methods, which prove, here, scheme-dependant. In the superconducting phase, the binding/antibinding gap is stabilized, but in the antiferromagnetic phase, it shrinks and the ladder turns one-dimensional.

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Increase in the superconducting transition temperature by anisotropic strain effect in (001) La1.85Sr0.15CuO4 thin films on LaSrAlO4 substrates

Cited by 189 publications

References 18 publications

Anomalous expansion of the copper-apical-oxygen distance in superconducting cuprate bilayers

Anomalous expansion of the copper-apical-oxygen distance in superconducting cuprate bilayers

Interesting Evidence for Template‐Induced Ferroelectric Behavior in Ultra‐Thin Titanium Dioxide Films Grown on (110) Neodymium Gallium Oxide Substrates

Functional renormalization-group calculation of the Fermi surface of a spin ladder

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