Quantum critical point in the Sc-doped itinerant antiferromagnet TiAu

Authors

E. Svanidze
T. BesaraFollow
J. K. Wang
D. Geiger
L. Prochaska
J. M. Santiago
J. W. Lynn
S. Paschen
T. Siegrist
E. Morosan

Abstract

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 Ti_1−xSc_xAu, a doping amount of x_c=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 C_p/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=x_c.

Document Type

Article

DOI

https://doi.org/10.1103/physrevb.95.220405

Rights Information

© 2017 American Physical Society

Keywords

antiferromagnetism, quantum criticality, quantum phase transitions, spin density waves, physical systems, disordered systems, condensed matter amd materials physics

Publication Date

2017

Recommended Citation

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).

Journal Title

Physical Review B