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Seminars & Lectures

* TITLE

Neutron Scattering in High-T$_c$ Cuprates: Two Component Spin-Fermion Model

* SPEAKERS

Name	Affiliation	E-mail
Yunkyu Bang	Chonnam Natl\' Univ.	hychoi(at)skku.edu

* HOST(Applicant)

Name	Affiliation	E-mail
-

* DATE / TIME

2007-06-08, 4:00 - 5:00 p.m.

* PLACE

Science Building Ⅲ, Physics Seminar room at POSTECH

* ABSTRACT

Recent neutron scattering experiments reveal that the generic form of the magnetic excitations of the high-Tc cuprates for wide range of doping has the so-called \"hour-glass\" behavior: it features both upward and downward excitations at the incommensurate (IC) momenta and merges as the resonance peak at the commensurate momentum of $(\\pi,\\pi)$. We propose the two-component spin-fermion model, having the local spin degrees of freedom and itinerant fermions, is a minimal phenomenological model to understand the neutron experiments. Calculations of the dynamic spin correlation function both at normal and superconducting phases are in good agreement with the essential features of the hour-glass form of the neutron experiments.

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