Spin-phonon interaction and band effects in the high-T_C superconductor HgBa_2CuO_4

Details Spin-phonon interaction and band effects in the high-T_C superconductor HgBa_2CuO_4 Spin-phonon interaction and band effects in the high-T_C superconductor HgBa_2CuO_4

2003-05-19

arxiv.org/abs/cond-mat/0305438v1

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure

Scientific paper

10.1103/PhysRevB.68.172501

Band calculations show that a stripe-like anti-ferromagnetic spin wave is enforced by a 'half-breathing' phonon distortion within the CuO plane of HgBa_2CuO_4. This spin-phonon coupling is increased further by shear distortion and by increased distance between Cu and apical oxygens. The effects from spin-phonon coupling are consistent with many observations in high-T_C materials. Spin-phonon coupling can be important for the mechanism of spin fluctuations and superconductivity, although the effects are quantitatively weak when using the local density potential.

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