Informace o publikaci

Intense paramagnon excitations in a large family of high-temperature superconductors

Název česky	Intenzivní paramagnonové excitace v široké třídě vyskoteplotních supravodičů
Autoři	LE TACON Mathieu GHIRINGHELLI G. CHALOUPKA Jiří MORETTI SALA M. HINKOV V. HAVERKORT M. W. MINOLA M. BAKR M. ZHOU K. J. BLANCO-CANOSA S. MONNEY C. SONG Y. T. SUN G. L. LIN C. T. DE LUCA G. M. SALLUZZO M. KHALIULLIN Giniyat SCHMITT T. BRAICOVICH L. KEIMER B.
Rok publikování	2011
Druh	Článek v odborném periodiku
Časopis / Zdroj	Nature Physics
Fakulta / Pracoviště MU	Přírodovědecká fakulta
Citace
www	http://www.nature.com/nphys/journal/v7/n9/abs/nphys2041.html
Doi	http://dx.doi.org/10.1038/NPHYS2041
Obor	Fyzika pevných látek a magnetismus
Klíčová slova	high-temperature superconductors; spin excitations
Popis	In the search for the mechanism of high-temperature superconductivity, intense research has been focused on the evolution of the spin excitation spectrum on doping from the antiferromagnetic insulating to the superconducting state of the cuprates. Because of technical limitations, the experimental investigation of doped cuprates has been largely focused on low-energy excitations in a small range of momentum space. Here we use resonant inelastic X-ray scattering to show that a large family of superconductors, encompassing underdoped YBa2Cu4O8 and overdoped YBa2Cu3O7, exhibits damped spin excitations (paramagnons) with dispersions and spectral weights closely similar to those of magnons in undoped cuprates. The comprehensive experimental description of this surprisingly simple spectrum enables quantitative tests of magnetic Cooper pairing models. A numerical solution of the Eliashberg equations for the magnetic spectrum of YBa2Cu3O7 reproduces its superconducting transition temperature within a factor of two, a level of agreement comparable to that of Eliashberg theories of conventional superconductors.