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Title: Unintended consequence of topochemical reduction of SrFe O 3 to SrFe O 2 : Design of infinite layered oxides

Journal Article · · Physical Review Materials

The infinite layer structure type has been known to host high-temperature superconductivity since the discovery of Ca 0.86 Sr 0.14 CuO 2 , yet little progress has been made to synthesize many analogs. Here, using SrFeO x as a prototype system, we explore the thermodynamic obstacles behind the scarcity of 3 d elements adopting the infinite layer structure type. In this context, synthetic considerations to achieve the A B O 3 to A B O 2 transformation are discussed. Specifically, we demonstrate that the conventionally reported topochemical reduction can result in hydride incorporation into SrFe O 2 , causing a decrease in the magnetic ordering temperature of the infinite layered oxide. First-principles simulations further confirm that the incorporation of H is necessary for stabilizing the SrFe O 2 phase by decreasing the thermodynamic cost of individual steps required to transform SrFe O 3 into SrFe O 2 , and is the driving factor behind the changes in magnetic exchange interactions that ultimately change the Néel temperature ( T N ). Additionally, inspired by recent reports of superconductivity in another low-dimensional oxide Nd 0.8 Sr 0.2 NiO 2 , Sr 0.95 Nd 0.05 FeO 2 was synthesized via a more traditional topochemical reduction procedure. Both physical characterization and accompanying density-functional theory calculations show that this A -site doping can have similar effects on A FeO 2 stability and magnetic ordering temperatures as with the incorporation of hydrogen. Ultimately, these results suggest that charge doping either through the incorporation of H or A -site substitution may be fruitful routes in tuning stability and magnetic properties, with direct consequences on superconducting behavior.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
20210662ECR; 89233218CNA000001; AC02-05CH11231; AC05-00OR22725
OSTI ID:
1837704
Alternate ID(s):
OSTI ID: 1837866; OSTI ID: 1844160
Report Number(s):
LA-UR-21-27840; PRMHAR; 123401
Journal Information:
Physical Review Materials, Journal Name: Physical Review Materials Vol. 5 Journal Issue: 12; ISSN 2475-9953
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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