210 K ULTRASONIC AND SPECIFIC HEAT ANOMALIES IN THE (Bi0.85Pb0.15)2Sr2Ca2Cu3O10+x SUPERCONDUCTORS

He, Yusheng; Xiang, Jie; Zhang, Jincang; He, Aisheng; Chang, Fanggao; Li, Fuxue

doi:10.1142/s0217984990000817

Cited by 7 publications

(3 citation statements)

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“…The fact that there is no variation of structural symmetry at low temperatures indicates that the anomalous variation of lattice spacing in the Bi2212 single crystal is not due to structural phase transition, but may be associated with the local readjustment of oxygen atoms which may cause lattice instability. We noticed that an ultrasonic anomaly at 210 K in the Bi2212 phase was also observed by He et al [32]. In order to clarify the mechanism of this lattice anomaly, further studies at the atomic level with the aid of other techniques are necessary.…”

Section: Resultssupporting

confidence: 67%

High-resolution electron microscopy and low-temperature electron diffraction studies of a Bi2212 single crystal grown by the floating zone method

Sun¹,

Kimoto²,

Mochiku³

1997

J Supercond

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High-resolution electron microscopy of a Bi2Sr2CaCu208 (Bi2212) single crystal prepared by the floating zone method shows that the single crystal is of high quality; there is no intergrowth faulting in the layered structure along the c-axis. Low-temperature selected area diffraction and convergent beam electron diffraction (CBED) studies of this high-quality single crystal show that there is no detectable change for both the point group symmetry of the basic structure and the modulated structure from room temperature to about 15 K. However, a lattice anomaly around 215 K was suggested by measuring the temperature dependence of the ratio between the cross-point distances of the HOLZ lines in high-index CBED patterns. The presence of the lattice anomaly was further confirmed by low-temperature X-ray diffraction.KEY WORDS: Single crystal of Bi2Sr2CaCu208; high-resolution electron microscopy; low-temperature electron diffraction; lattice anomaly.

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Section: Resultssupporting

confidence: 67%

High-resolution electron microscopy and low-temperature electron diffraction studies of a Bi2212 single crystal grown by the floating zone method

Sun¹,

Kimoto²,

Mochiku³

1997

J Supercond

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“…We are interested in outing wave when the black hole radiation is studied. From (33), the outing wave is singular at r = r + , we can extend Ψ out from the outside of the black hole into the inside of the black hole. We take the singularity r = r + as the center of a circle, and take |r − r + | as radius.…”

Section: Analytic Extensionmentioning

confidence: 99%

Hawking radiation of Kerr–Newman–de Sitter black hole

Zhang

Yueqin

et al. 2009

Eur. Phys. J. C

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We extend the classical Damour-Ruffini method and discuss Hawking radiation in Kerr-Newman-de Sitter(KNdS) black hole. Under the condition that the total energy, angular momentum and charge of spacetime are conserved, taking the reaction of the radiation of the particle to the spacetime and the relation between the black hole event horizon and the cosmological horizon into consideration, we derive the black hole radiation spectrum. The radiation spectrum is no longer a pure thermal one. It is related to the change of the Bekenstein-Hawking entropy corresponding the black hole event horizon and the cosmological horizon. It is consistent with an underlying unitary theory.

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“…Complementary to the direct search, some features of the leptophobic Z boson can also be constrained indirectly in the flavor physics. The family-non-universal Z boson may induce tree-level flavor changing neutral currents (FCNCs) and thus they are severely bounded by experiment, most notably meson mixing [27][28][29][30][31][32][33][34][35][36][37][38][39]. Other effects of the FCNC induced by Z in flavor physics have been studied extensively in past decades .…”

Section: Introductionmentioning

confidence: 99%

Impact of family-non-universal $$Z^\prime $$ Z ′ boson on pure annihilation $$B_s \rightarrow \pi ^+ \pi ^-$$ B s → π + π - and $$B_d \rightarrow K^+ K^-$$ B d → K + K - decays

Liu

Wang

et al. 2015

Eur. Phys. J. C

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We study the B s → π + π − and B d → K + K − decays in the standard model and the family-non-universal Z model. Since none of the quarks in the final states is the same as the initial quark, these decay modes can occur only via power-suppressed annihilation diagrams. Despite the consistency of the standard model prediction with the available data, room remains for a light Z boson. Taking into account the Z contribution, we find that theoretical results for the branching fractions can better accommodate the data. With the relevant data, we also derive a constraint on the parameter space for the Z . Moreover, for B d → K + K − , both the direct and the mixing-induced CP asymmetry are sensitive to the couplings between Z and fermions in the parameter spaces constrained by the data. The measurements at future experimental facilities, including the LHCb, Belle-II, and the proposed high energy e + e − collider, will provide us useful hints for direct searching for the light Z boson.

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210 K ULTRASONIC AND SPECIFIC HEAT ANOMALIES IN THE (Bi_0.85Pb_0.15)₂Sr₂Ca₂Cu₃O_10+x SUPERCONDUCTORS

Cited by 7 publications

References 0 publications

High-resolution electron microscopy and low-temperature electron diffraction studies of a Bi2212 single crystal grown by the floating zone method

High-resolution electron microscopy and low-temperature electron diffraction studies of a Bi2212 single crystal grown by the floating zone method

Hawking radiation of Kerr–Newman–de Sitter black hole

Impact of family-non-universal $$Z^\prime $$ Z ′ boson on pure annihilation $$B_s \rightarrow \pi ^+ \pi ^-$$ B s → π + π - and $$B_d \rightarrow K^+ K^-$$ B d → K + K - decays

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