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Journal Articles

Spin excitations in optimally P-doped BaFe$$_2$$(As$$_{0.7}$$P$$_{0.3}$$)$$_2$$ superconductor

Hu, D.*; Yin, Z.*; Zhang, W.*; Ewings, R. A.*; Ikeuchi, Kazuhiko*; Nakamura, Mitsutaka; Roessli, B.*; Wei, Y.*; Zhao, L.*; Chen, G.*; et al.

Physical Review B, 94(9), p.094504_1 - 094504_7, 2016/09

AA2016-0252.pdf:2.18MB

 Times Cited Count:14 Percentile:61.4(Materials Science, Multidisciplinary)

The temperature and energy dependence of spin excitations in an optimally P-doped BaFe$$_2$$(As$$_{0.7}$$P$$_{0.3}$$)$$_2$$ superconductor (T$$_c$$ = 30 K) were studied by using inelastic neutron scattering. Experimental results are consistent with calculations from a combined density functional theory and dynamical mean field theory, and suggest that the decreased average pnictogen height in BaFe$$_2$$(As$$_{0.7}$$P$$_{0.3}$$)$$_2$$ reduces the strength of electron correlations and increases the effective bandwidth of magnetic excitation.

Journal Articles

Magnetization dynamics in the normal and superconducting phases of UPd$$_2$$Al$$_3$$, 1; Surveys in reciprocal space using neutron inelastic scattering

Hiess, A.*; Bernhoeft, N.*; Metoki, Naoto; Lander, G.*; Roessli, B.*; Sato, Noriaki*; Aso, Naofumi*; Haga, Yoshinori; Koike, Yoshihiro*; Komatsubara, Takemi*; et al.

Journal of Physics; Condensed Matter, 18(27), p.R437 - R451, 2006/07

 Times Cited Count:31 Percentile:33.53(Physics, Condensed Matter)

This topical review presents results from neutron inelastic scattering experiments on single crystals of UPd$$_2$$Al$$_3$$. We present a detailed and complete characterization of the wave vector- and energy-dependent magnetization dynamics in UPd$$_2$$Al$$_3$$ as measured by neutron inelastic scattering primarily in the form of extensive surveys in energy-momentum space under a wide range of experimental conditions, and put our observations in context with data that has been published previously by two independent groups. This study yields unique insight into the low-temperature ground state, which exhibits a microscopic coexistence of antiferromagnetism and superconductivity, makingUPd$$_2$$Al$$_3$$ one of the most accessible heavy-fermion superconductors that can be fully characterized by neutron spectroscopy.

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