Effect of spin fluctuations on Tc from density-functional theory for superconductors

M. Wierzbowska

doi:10.1140/epjb/e2005-00394-9

EPJ

Effect of spin fluctuations on T_c from density-functional theory for superconductors

M. Wierzbowska^a

INFM DEMOCRITOS National Simulation Center, via Beirut 2–4, 34014 Trieste, Italy

Received: 11 June 2005
Published online: 16 December 2005

Abstract

The transverse spin fluctuations are introduced to the density functional theory for superconductors (SCDFT). Paramagnons are treated within the random phase approximation and assumed to be the same for the normal and superconducting state. The effect of spin fluctuations on T_c is studied for a few simple metals at ambient pressure and niobium at several pressures up to 80 GPa.  

PACS: 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) / 74.62.-c – Transition temperature variations / 74.70.Ad – Metals; alloys and binary compounds (including A15, MgB2, etc.) / 71.70.Gm – Exchange interactions