Condensed-Matter Physics & Materials Science Seminar

"3D non-Fermi liquid behavior from 1D critical local moments"

Presented by Laura Classen, BNL

Thursday, March 1, 2018, 1:30 pm — ISB Bldg. 734 Conf. Rm. 201 (upstairs)

We study the temperature dependence of the electrical resistivity in a system composed of critical spin chains interacting with three dimensional conduction electrons and driven to criticality via an external magnetic field. The relevant experimental system is Yb2Pt2Pb, a metal where itinerant electrons coexist with localized moments of Yb-ions which can be described in terms of effective S = 1/2 spins with dominantly one-dimensional exchange interaction. The spin subsystem becomes critical in a relatively weak magnetic field, where it behaves like a Luttinger liquid. We theoretically examine a Kondo lattice with different effective space dimensionalities of the two interacting sub-systems. We characterize the corresponding non-Fermi liquid behavior due to the "local criticality" from the spins by calculating the electronic relaxation rate and the dc resistivity and establish its quasi linear temperature dependence.

Hosted by: Igor Zaliznyak

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