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Scaling of magnetic fluctuations near a quantum phase transition | | A. Schroder
; G. Aeppli
; E. Bucher
; R. Ramazashvili
; P. Coleman
; | | Date: |
1 Mar 1998 | | Journal: | Phys. Rev. Lett., Vol 80, 5623 (1998) | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | 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. | | Source: | arXiv, cond-mat/9803004 | | Services: | Forum | Review | PDF | Favorites | |
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