The experimental determination of the scaling of the superconducting critical temperature (T-c) vs the Fermi temperature (T-f) of the holes in the boron sigma subband is presented. The Fermi level has been tuned near the "shape resonance," i.e., the two- to three-dimensional crossover of the Fermi surface of the boron sigma subband by changing the Al/Mg content in Al1-xMgxB2. The product k(f)xi(0) of the Fermi wave vector (k(f)) times the superconducting Pippard coherence length (xi(0)), that is a measure of the pairing strength, remains constant, k(f)xi(0)=90 for x>0.66. This high-T-c phase occurs in the boron superlattice under a tensile microstrain in the range 3%<epsilon<6%.

The experimental determination of the scaling of the superconducting critical temperature (Tc) vs the Fermi temperature (Tf) of the holes in the boron σ subband is presented. The Fermi level has been tuned near the "shape resonance," i.e., the two- to three-dimensional crossover of the Fermi surface of the boron σ subband by changing the Al/Mg content in Al1 - xMgxB2. The product kfξ0 of the Fermi wave vector (kf) times the superconducting Pippard coherence length (ξ0), that is a measure of the pairing strength, remains constant, kfξ0 = 90 for x>0.66. This high-Tc phase occurs in the boron superlattice under a tensile microstrain in the range 3%<ε<6%.

Scaling of the critical temperature with the Fermi temperature in diborides

PROFETA, Gianni;CONTINENZA, Alessandra;
2002-01-01

Abstract

The experimental determination of the scaling of the superconducting critical temperature (Tc) vs the Fermi temperature (Tf) of the holes in the boron σ subband is presented. The Fermi level has been tuned near the "shape resonance," i.e., the two- to three-dimensional crossover of the Fermi surface of the boron σ subband by changing the Al/Mg content in Al1 - xMgxB2. The product kfξ0 of the Fermi wave vector (kf) times the superconducting Pippard coherence length (ξ0), that is a measure of the pairing strength, remains constant, kfξ0 = 90 for x>0.66. This high-Tc phase occurs in the boron superlattice under a tensile microstrain in the range 3%<ε<6%.
2002
The experimental determination of the scaling of the superconducting critical temperature (T-c) vs the Fermi temperature (T-f) of the holes in the boron sigma subband is presented. The Fermi level has been tuned near the "shape resonance," i.e., the two- to three-dimensional crossover of the Fermi surface of the boron sigma subband by changing the Al/Mg content in Al1-xMgxB2. The product k(f)xi(0) of the Fermi wave vector (k(f)) times the superconducting Pippard coherence length (xi(0)), that is a measure of the pairing strength, remains constant, k(f)xi(0)=90 for x>0.66. This high-T-c phase occurs in the boron superlattice under a tensile microstrain in the range 3%<epsilon<6%.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11697/5044
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 87
  • ???jsp.display-item.citation.isi??? 86
social impact