Inducing magnetic order by rare-earth-doping in (Sr,La)Co2As2
By contrast with the closely related iron based superconductors (FeSC), research into isostructural cobalt arsenide compounds aims to isolate the key properties and interactions enabling high temperature superconductivity. The magnetic fluctuation spectrum of SrCo2As2 has recently been found to be a carbon copy of that found in 122-type FeSC [4]. If spin excitations are expected to mediate superconducting pairing in materials such as SrFe2As2, it is relevant to determine what property prevents superconductivity in SrCo2As2. In the present study, we dope La into the Sr site to destabilise the paramagnetic (possibly spin liquid) state in SrCo2As2. Unexpectedly, this abruptly induces robust ferromagnetic order of the Co3+ ions, with an unusual non-monotonic doping dependence. We select three compounds in the (Sr,La)Co2As2 doping range for magnetic structure determination by neutron powder diffraction. Given their magnetic moments of 0.35 to 0.53 Bohr magnetons, we expect an appreciable magnetic signal on D20.
Please note that you will need to login with your ILL credentials to download the data.
Download DataThe recommended format for citing this dataset in a research publication is in the following format:
Marein C. Rahn; BOOTHROYD Andrew Timothy; GUO Yanfeng; Thomas C. Hansen and PRINCEP Andrew. (2015). Inducing magnetic order by rare-earth-doping in (Sr,La)Co2As2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2430
ILL has partnered with DataCite as the registration agency
for data persistent identifiers.