Metastable T′-phase in bulk La2−xLnxCuO4 (Ln=Sm and Y)

Liu, R. H.; Zhao, Li Min; Yang, Haoran; Chen, X.H.

doi:10.1016/j.physc.2008.06.007

Cited by 5 publications

(7 citation statements)

References 14 publications

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“…For ϑ = π/2, the observer is located in the equatorial plane of the disk, and the GW amplitude is the largest. The local energy flux of GWs is given by (e.g., Suwa & Murase 2009;Liu et al 2017b)…”

Section: Gws From Ndafsmentioning

confidence: 99%

“…Sun et al (2012) studied the GWs from jet precession driven by an NDAF around a spinning BH. GWs generated by the anisotropic neutrino emission from NDAFs have been discussed in some studies (e.g., Suwa & Murase 2009;Liu et al 2017b). Liu et al (2017b) calculated the dependence of the GW strains from NDAFs on both the BH spin and accretion rate.…”

Section: Introductionmentioning

confidence: 99%

“…GWs generated by the anisotropic neutrino emission from NDAFs have been discussed in some studies (e.g., Suwa & Murase 2009;Liu et al 2017b). Liu et al (2017b) calculated the dependence of the GW strains from NDAFs on both the BH spin and accretion rate. They demonstrated that GWs from NDAFs might be detected at a distance of ∼ 100 kpc/∼1Mpc by the advanced LIGO/Einstein Telescope (ET) with a typical frequency of ∼10-100 Hz.…”

Section: Introductionmentioning

confidence: 99%

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Black Hole Hyperaccretion in Collapsars. II. Gravitational Waves

Wei¹,

Liu

2020

ApJ

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As progenitors of gamma-ray bursts (GRBs), core collapse of massive stars and coalescence of compact object binaries are believed to be powerful sources of gravitational waves (GWs). In the collapsar scenario, a rotating stellar-mass black hole (BH) surrounded by a hyperaccretion disk might be running in the center of a massive collapsar, which is one of the plausible central engines of long GRBs. Such a BH hyperaccretion disk would be in a state of a neutrino-dominated accretion flow (NDAF) at the initial stage of the accretion process; meanwhile, the jets attempt to break out from the envelope and circumstellar medium to power GRBs. In addition to collapsars, the BH hyperaccretion systems are important sources of neutrinos and GWs. In this paper, we investigated the GW emission generated by the anisotropic neutrino emission from NDAFs in the collapsar scenarios. As the results indicate, the typical frequency of GWs is ∼ 1-100 Hz, and the masses and metallicities of the progenitor stars have slight effects on the GW strains. The GWs from NDAFs might be detected by operational or planned detectors at the distance of 10 kpc. Moreover, comparisons of the detectable GWs from collapsars, NDAFs, and GRB jets (internal shocks) are displayed. By combining the electromagnetic counterparts, neutrinos, and GWs, one may constrain the characteristics of collapsars and central BH accretion systems.

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Section: Gws From Ndafsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Black Hole Hyperaccretion in Collapsars. II. Gravitational Waves

Wei¹,

Liu

2020

ApJ

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“…The samples prepared show a transition to the T phase at a temperature lower than the one reported, between 200 and 225°C (Figure 1). On the other hand, there have been several attempts to synthesise T′-La 2 CuO 4 [3,14]. The T′ phase can be achieved in specific conditions like low temperature thin film synthesis [11] or bulk synthesis [18].…”

Section: +mentioning

confidence: 99%

“…Most of these works study electrical and magnetic properties, specially the superconductivity, trying to achieve higher critical temperatures by changing the sample composition [1][2][3]. La 2-x Sr x CuO 4 has been especially well studied as it is the only copper-oxide superconductor for which the chemical composition can be varied over a wide enough range to obtain a full spectrum of electronic properties.…”

Section: Introductionmentioning

confidence: 99%

On the Stability of Sr‐Doped La₂CuO₄ Against Different Electrolytes for IT‐SOFCs

et al. 2011

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The thermal stability of the cathode material against an electrolyte at the operating temperature plays an important role in the fuel cell's performance. As such, compatibility tests of the most common used electrolytes with La2–xSrxCuO4 have been performed. The chemical reaction between these two materials in the temperature ranging from 800 to 1,000 °C was examined by X‐ray diffraction analyses. The results show that in all the cases there is reaction above 925 °C, making conventional cell fabrication non‐appropriate. However, we demonstrate that infiltration is a useful technique for obtaining cuprate cermets for use as cathode materials in IT‐SOFCs.

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Superconductivity in bulk T′-(La,Sm)2CuO4 prepared via a molten alkaline hydroxide route

Asai

Ueda

Naito

2011

Physica C: Superconductivity and its Applications

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We report the synthesis of new superconducting cuprates T'-La 2-x RE x CuO 4 (RE = Sm, Eu, Tb Lu, and Y) using molecular beam epitaxy. The new superconductors have no effective dopant, at least nominally. The substitution of isovalent RE for La was essentially performed to stabilize the T' phase of La 2 CuO 4 instead of the T phase.The maximum T c onset is ~ 25 K and T c zero is ~ 21 K. The keys to our discovery are (1) the preparation of high-crystalline-quality La-based T' films by low-temperature (~ 650°C) thin film processes, and (2) more thorough removal of impurity oxygen at the apical site, which is achieved by the larger in-plane lattice constant (a 0 ) of T'-La 2-x RE x CuO 4 than other T'-Ln 2 CuO 4 (Ln = Pr, Nd, Sm, Eu, Gd) with the aid of large surface-to-volume ratio of thin films.1

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Metastable T′-phase in bulk La2−xLnxCuO4 (Ln=Sm and Y)

Cited by 5 publications

References 14 publications

Black Hole Hyperaccretion in Collapsars. II. Gravitational Waves

Black Hole Hyperaccretion in Collapsars. II. Gravitational Waves

On the Stability of Sr‐Doped La₂CuO₄ Against Different Electrolytes for IT‐SOFCs

Superconductivity in bulk T′-(La,Sm)2CuO4 prepared via a molten alkaline hydroxide route

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Metastable T′-phase in bulk La2−xLnxCuO4 (Ln=Sm and Y)

Cited by 5 publications

References 14 publications

Black Hole Hyperaccretion in Collapsars. II. Gravitational Waves

Black Hole Hyperaccretion in Collapsars. II. Gravitational Waves

On the Stability of Sr‐Doped La2CuO4 Against Different Electrolytes for IT‐SOFCs

Superconductivity in bulk T′-(La,Sm)2CuO4 prepared via a molten alkaline hydroxide route

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On the Stability of Sr‐Doped La₂CuO₄ Against Different Electrolytes for IT‐SOFCs