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Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 41: Correlated Electrons: Quantum-Critical Phenomena

TT 41.2: Talk

Wednesday, March 22, 2017, 09:45–10:00, HSZ 204

Critical spin dynamics in YbCo2Si2A. Hannaske1, K. Schmalzl2, C. Geibel1, and •O. Stockert11Max-Planck-Institut CPfS, Dresden, Germany — 2JCNS at ILL, Grenoble, France

The strongly correlated compound YbCo2Si2 is the antiferromagnetically ordered sister compound to quantum critical YbRh2Si2. The magnetic order in YbCo2Si2 with TN = 1.7  K can be continuously suppressed upon application of a magnetic field with a critical field of Bc = 2  T. We performed detailed inelastic neutron scattering experiments on single-crystalline YbCo2Si2 to study the spin dynamics at Bc. A critical slowing down of the magnetic response is observed as function of temperature at Bc with slightly sublinear temperature dependence of the relaxation rate of the critical spin fluctuations. Moreover, as inferred from measurements at finite momentum transfer, away from the antiferromagnetic ordering wave vector, the paramagnons soften and their lifetime decreases with temperature. Our results will be compared with theoretical calculations.

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