« back to the research page

Impurity Effects in Highly Frustrated Diamond Lattice Antiferromagnets

In this project, we study the effect of impurities in frustrated magnets with a highly degenerate ground state. We specialize to diamond lattice antiferromagnets with J1-J2 interactions. There, the ground state degeneracy is that of a surface, for couplings where J2/J1>1/8. More precisely, the spins order in a spiral whose wave-vector lies on any point of the "degeneracy surface" that corresponds to a given value of J2/J1.

We show that dilute impurities break the (ground state) degeneracy by selecting a "compromise" wave-vector in the degeneracy surface. The ground state in the presence of dilute impurities is the associated "compromise" spiral, locally deformed around impurities, making the system look like a "swiss cheese".

Check it out!

authors: L. Savary, E. Gull, S. Trebst, J. Alicea, D. Bergman, L. Balents

Bibtex (Show/Hide)

journal = {Phys. Rev. B},
month = {Aug},
url = {http://link.aps.org/doi/10.1103/PhysRevB.84.064438},
publisher = {American Physical Society},
author = {Savary, Lucile and Gull, Emanuel and Trebst, Simon and Alicea, Jason and Bergman, Doron and Balents, Leon},
title = {Impurity effects in highly frustrated diamond-lattice antiferromagnets},
year = {2011},
pages = {064438},
numpages = {12},
volume = {84},
doi = {10.1103/PhysRevB.84.064438},
issue = {6}