English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

CaCo2As2 is a unique itinerant system having strong magnetic frustration.Here we report the effect of electron doping on the physical propertiesresulting from Ni substitutions for Co. The A-type antiferromagnetic transitiontemperature TN = 52 K for x = 0 decreases to 22 K with only 3 percent Nisubstitution and is completely suppressed for x > 0.11. For 0.11 < x < 0.52strong ferromagnetic (FM) fluctuations develop as revealed by magneticsusceptibility chi(T) measurements. Heat-capacity Cp(T) measurements reveal thepresence of FM quantum spin fluctuations for 0.11 < x < 0.52. Ourdensity-functional theory (DFT) calculations confirm that FM fluctuations areenhanced by Ni substitutions for Co. The Sommerfeld electronic heat-capacitycoefficient is enhanced for x = 0, 0.21, and 0.42 by about a factor of twocompared to DFT calculations of the bare density of states at the Fermi energy.The crystals with x > 0.52 do not exhibit FM spin fluctuations or magneticorder, which was found from the DFT calculations to arise from a Stonertransition. Neutron-diffraction studies of crystals with x = 0.11 and 0.16found no evidence of A-type ordering as observed in CaCo2As2 or of other commonmagnetic structures.

Suppression of antiferromagnetic order and strong ferromagnetic spin fluctuations in Ni-doped CaCo2As2 single crystals