Scaling of magnetic fluctuations near a quantum phase transition

Дата и время публикации : 1998-03-01T18:44:52Z

Авторы публикации и институты :
A. Schroder
G. Aeppli
E. Bucher
R. Ramazashvili
P. Coleman

Ссылка на журнал-издание: Phys. Rev. Lett., Vol 80, 5623 (1998)
Коментарии к cтатье: Latex file with two postscript figures
Первичная категория: cond-mat.str-el

Все категории : cond-mat.str-el

Краткий обзор статьи: We use inelastic neutron scattering to measure the magnetic fluctuations in a single crystal of the heavy fermion alloy CeCu_5.9Au_0.1 close to the antiferromagnetic quantum critical point. The energy and temperature-dependent spectra obey (E/T) scaling at Q near (1,0,0). The neutron data and earlier bulk susceptibility are consistent with the form 1/X ~ f(Q)+(-iE+bT)^a, with an anomalous exponent a=0.8. We confirm the earlier observation of quasi-low dimensionality and show how both the magnetic fluctuations and the thermodynamics can be understood in terms of a quantum Lifshitz point.

Category: Physics