title: Aging, memory, and nonhierarchical energy landscape of spin jam.
abstract: The notion of complex energy landscape underpins the intriguing dynamical behaviors in many complex systems ranging from polymers, to brain activity, to social networks and glass transitions. The spin glass state found in dilute magnetic alloys has been an exceptionally convenient laboratory frame for studying complex dynamics resulting from a hierarchical energy landscape with rugged funnels. Here, we show, by a bulk susceptibility and Monte Carlo simulation study, that densely populated frustrated magnets in a spin jam state exhibit much weaker memory effects than spin glasses, and the characteristic properties can be reproduced by a nonhierarchical landscape with a wide and nearly flat but rough bottom. Our results illustrate that the memory effects can be used to probe different slow dynamics of glassy materials, hence opening a window to explore their distinct energy landscapes.
authors.affiliation: Department of Physics, University of Virginia, Charlottesville, VA 22904.
authors.forename: Anjana
authors.initials: A
authors.lastname: Samarakoon
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira, Sendai 980-8577, Japan.
authors.forename: Taku J
authors.initials: TJ
authors.lastname: Sato
authors.affiliation: Department of Physics, University of Virginia, Charlottesville, VA 22904.
authors.forename: Tianran
authors.initials: T
authors.lastname: Chen
authors.affiliation: Department of Physics, University of Virginia, Charlottesville, VA 22904.
authors.forename: Gai-Wei
authors.initials: GW
authors.lastname: Chern
authors.affiliation: Department of Physics, University of Virginia, Charlottesville, VA 22904.
authors.forename: Junjie
authors.initials: J
authors.lastname: Yang
authors.affiliation: Department of Physics, University of Virginia, Charlottesville, VA 22904.
authors.forename: Israel
authors.initials: I
authors.lastname: Klich
authors.affiliation: Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996.
authors.forename: Ryan
authors.initials: R
authors.lastname: Sinclair
authors.affiliation: Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996.
authors.forename: Haidong
authors.initials: H
authors.lastname: Zhou
authors.affiliation: Department of Physics, University of Virginia, Charlottesville, VA 22904; shlee@virginia.edu.
authors.forename: Seung-Hun
authors.initials: SH
authors.lastname: Lee
keywords: energy landscape; memory; spin glass; spin jam