We present an experimental realization of a quantum critical point in an itinerant antiferromagnet composed of nonmagnetic constituents, TiAu. By partially substituting Ti with Sc in Ti1−xScxAu, a doping amount of xc=0.13±0.01 induces a quantum critical point with minimal disorder effects. The accompanying non-Fermi liquid behavior is observed in both the resistivity ρ∝ and specific heat Cp/T∝−lnT, characteristic of a two-dimensional antiferromagnet. The quantum critical point is accompanied by an enhancement of the spin fluctuations, as indicated by the diverging Sommerfeld coefficient γ at x=xc.
© 2017 American Physical Society
antiferromagnetism, quantum criticality, quantum phase transitions, spin density waves, physical systems, disordered systems, condensed matter amd materials physics
Svanidze, E., T. Besara, J. K. Wang, D. Geiger, L. Prochaska, J. M. Santiago, Jeffrey W. Lynn, S. Paschen, T. Siegrist, and E. Morosan. "Quantum critical point in the Sc-doped itinerant antiferromagnet TiAu." Physical Review B 95, no. 22 (2017).
Physical Review B