Pressure Effects and Large Polarons in Layered MgB_2 Superconductor

Details Pressure Effects and Large Polarons in Layered MgB_2 Superconductor Pressure Effects and Large Polarons in Layered MgB_2 Superconductor

2002-06-16

arxiv.org/abs/cond-mat/0206300v1

Physics

Condensed Matter

Superconductivity

6 pages, 1 fig, LaTeX, subm. to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.66.134519

We consider the dependence of the MgB_2 superconducting critical temperature on the pressure. Our model exploits the influence of the large polarons on the band structure of the layered MgB_2 superconductor. Namely, the hole Pekar-Froehlich polarons form quasi two-dimensional potential wells in the boron plane which shift the positions of the sigma- and pi-bands. This energy shift depends on the pressure and the Cooper pairing of the correlated sigma-electrons happens inside polaron wells. The results obtained are as follows: dT_c/dp = -\alpha (5.2 \pm 0.9) K/GPa or dT_c/dp = -\alpha (6.9\pm 1.1) K/GPa for a different choice of the Grueneisen parameter. Being compared with known experimental data they give us a resonable interval for the value of the Froehlich electron-phonon coupling constant: \alpha = 0.15 - 0.45.

Affiliated with

Also associated with

No associations

Rating

Pressure Effects and Large Polarons in Layered MgB_2 Superconductor does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Pressure Effects and Large Polarons in Layered MgB_2 Superconductor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure Effects and Large Polarons in Layered MgB_2 Superconductor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-720208