Superfluid density in He II near the lambda transition: First principles theory

Physica B Condensed Matter ◽

10.1016/j.physb.2014.11.102 ◽

2015 ◽

Vol 461 ◽

pp. 92-100 ◽

Cited By ~ 1

Author(s):

H.W. Jackson

Keyword(s):

First Principles ◽

Superfluid Density ◽

Lambda Transition

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Comment on “Liquid 4He: Contributions to First Principles Theory. II. Quantized Vortices and the Lambda Transition”

Journal of Low Temperature Physics ◽

10.1007/s10909-009-9909-8 ◽

2009 ◽

Vol 157 (1-2) ◽

pp. 73-74

Author(s):

Gary A. Williams

Keyword(s):

First Principles ◽

Quantized Vortices ◽

Lambda Transition

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Second-sound velocity and superfluid density in3He-4He mixtures near the lambda transition

Journal of Physics C Solid State Physics ◽

10.1088/0022-3719/9/19/011 ◽

1976 ◽

Vol 9 (19) ◽

pp. 3573-3582 ◽

Cited By ~ 1

Author(s):

T Kobayashi ◽

A Tominaga ◽

Y Narahara ◽

F Uehara ◽

T Fushimi

Keyword(s):

Sound Velocity ◽

Superfluid Density ◽

Second Sound ◽

Lambda Transition

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Self-Consistent Two-Gap Description of MgB2 Superconductor

Symmetry ◽

10.3390/sym11081012 ◽

2019 ◽

Vol 11 (8) ◽

pp. 1012 ◽

Cited By ~ 2

Author(s):

Hyunsoo Kim ◽

Kyuil Cho ◽

Makariy A. Tanatar ◽

Valentin Taufour ◽

Stella K. Kim ◽

...

Keyword(s):

First Principles ◽

Quantitative Description ◽

Superfluid Density ◽

Thermodynamic Quantities ◽

First Principles Calculations ◽

Temperature Dependent ◽

Critical Fields ◽

Coupling Matrix ◽

Self Consistent ◽

Upper Critical Fields

A self-consistent two-gap γ -model is used to quantitatively describe several thermodynamic properties of MgB 2 superconductor. The superconducting coupling matrix, ν i j , was obtained from the fitting of the superfluid density in the entire superconducting temperature range. Using this input, temperature-dependent superconducting gaps, specific heat, and upper critical fields were calculated with no adjustable parameters and compared with the experimental data as well as with the first-principles calculations. The observed agreement between fit and data shows that γ -model provides adequate quantitative description of the two-gap superconductivity in MgB 2 and may serve as a relatively simple and versatile self-consistent description of the thermodynamic quantities in multi-gap superconductors.

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