SYMMETRY DETERMINATION OF LiZnTa3O9 AND LiCaTa3O9 CRYSTALS BY CBED

Cuiying, Yang; Zhou, Yuqing; Qi-Mao, Shu; Hong-Chang, Xia; Chen, Yingping; Guo-Guang, Feng

doi:10.7498/aps.33.1687

Cited by 2 publications

(7 citation statements)

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“…It then inflects and slopes downwards. These nontrivial behaviors of were also reported in a weak first-order phase transition [64] and a strong first-order phase transition [37] using the exact numerical method. However, these nontrivial properties seemed to be completely destroyed by the thin-wall approximation.…”

Section: A Top-downsupporting

confidence: 60%

“…perature T usually exhibits a non-monotonic behavior as the temperature increases. This can be taken as one of the salient properties of the strong first-order phase transition [37]. Besides the non-trivial property of the saddlepoint action, there is another obvious difference from that of the first-order phase transitions.…”

Section: A Top-downmentioning

confidence: 99%

“…Therefore, in the bottom-up scenario, is a monotonically decreasing function of T, whereas in the top-down scenario it is a non-monotonic function and has a nontrivial behavior. Sometimes, the nontrivial evolution of suggests that the temperature dependent surface tension has a maximum value at a specific temperature, and it can be taken as a limit to the applicability of the thin-wall approximation [37,64]. Thus, for the bottom-up scenario, we need to develop an alternative method to estimate the scope in which the thin-wall approximation is valid.…”

Section: B Bottom-upmentioning

confidence: 99%

“…[46], since the thin-wall approximation is a reliable tool at . Note that most effective models also predict small values as , such as the MIT bag model [67], NJL model [68,69], three-flavor PQM model [44], the chiral nucleon-meson model [70], and the Friedberg-Lee model [37]. Such a small value of the surface tension would lead to quarkmatter formation during core-collapse supernova explosions and favor a mixed phase in the cores of compact stars, so that this reasonably small surface tension could provide an observable signal of the first-order phase transition within compact stars and play an important role in astrophysics.…”

Section: T C T → T C2mentioning

confidence: 99%

“…For a strong first-order phase transition, which is usually characterized by an effective potential with a zerotemperature potential barrier, the quark-hadron phase conversion dynamics based on the Friedberg-Lee (FL) model [36] have been studied numerically [37], and the findings have also been compared to the analytic results obtained with the thin-wall approximation [38]. Since the FL model lacks chiral symmetry, the model only predicts a first-order phase transition in the entire QCD phase diagram.…”

Section: Introductionmentioning

confidence: 99%

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Bubble nucleation in the two-flavor quark-meson model*

Wang 汪,

Yu 余,

Mao 毛

2024

Chinese Phys. C

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We investigate the dynamics of a first-order quark-hadron transition via homogeneous thermal nucleation in the two-flavor quark-meson model. The contribution of the fermionic vacuum loop in the effective thermodynamics potential and phase diagram together with the location of critical end point (CEP) have been obtained in the temperature and chemical potential plane. For a weak and strong first-order phase transition, by taking the temperature as a variable, the critical bubble profiles, the evolutions of the surface tension and the saddle-point action in the presence of a nucleation bubble are numerically calculated in detail when fixing the chemical potentials at $\mu=306 \mathrm{MeV}$ and $\mu=309 \mathrm{MeV}$. Our results show that the system could be trapped in the metastable state for a long time as long as the temperature is between the metastable region characterized by the up and low spinodal lines. Moreover, the surface tension at criticality will rise up to about $4 \mathrm{MeV/fm^2}$ when the chemical potential is very high. Such a small value of the surface tension would favor a mixed phase in the cores of compact stars and may have an important implication in astrophysics. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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Section: A Top-downsupporting

confidence: 60%

Section: A Top-downmentioning

confidence: 99%

Section: B Bottom-upmentioning

confidence: 99%

Section: T C T → T C2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bubble nucleation in the two-flavor quark-meson model*

Wang 汪,

Yu 余,

Mao 毛

2024

Chinese Phys. C

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Application of convergent beam electron diffraction in the structural study of high‐temperature superconducting oxides

Zou

Yang

Zhou

1987

J. Elec. Microsc. Tech.

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Convergent beam electron diffraction (CBED) is a powerful technique for symmetry study of crystal. It has widespread application in physics and material sciences, as demonstrated in a recent superconducting oxide study. Using this technique, we have studied Ba-La-Cu-O superconductors with a transition temperature of about 40 degrees K and Ba-Y-Cu-O superconductors with a critical temperature (Tc) of about 90 degrees K. We have found that in Ba-La-Cu-O superconductors the superconducting phase La2-xBaxCuO4-y has a distorted K2NiF4-type structure and the space group Fmmm. The two other phases in Ba-La-Cu-O superconductors have also been studied. In our Ba-Y-Cu-O superconductors, the Ba2YCu3O7-x compound, which is responsible for 90 degrees K superconductivity, has two different space groups: An orthorhombic space group Pmmm and a tetragonal space group P4mm or P4/mmm.

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SYMMETRY DETERMINATION OF LiZnTa3O9 AND LiCaTa3O9 CRYSTALS BY CBED

Cited by 2 publications

References 0 publications

Bubble nucleation in the two-flavor quark-meson model*

Bubble nucleation in the two-flavor quark-meson model*

Application of convergent beam electron diffraction in the structural study of high‐temperature superconducting oxides

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