Unintended consequence of topochemical reduction of to : Design of infinite layered oxides
The infinite layer structure type has been known to host high-temperature superconductivity since the discovery of , yet little progress has been made to synthesize many analogs. Here, using as a prototype system, we explore the thermodynamic obstacles behind the scarcity of elements adopting the infinite layer structure type. In this context, synthetic considerations to achieve the to transformation are discussed. Specifically, we demonstrate that the conventionally reported topochemical reduction can result in hydride incorporation into , 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 phase by decreasing the thermodynamic cost of individual steps required to transform into , and is the driving factor behind the changes in magnetic exchange interactions that ultimately change the Néel temperature ( ). Additionally, inspired by recent reports of superconductivity in another low-dimensional oxide , was synthesized via a more traditional topochemical reduction procedure. Both physical characterization and accompanying density-functional theory calculations show that this -site doping can have similar effects on 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 -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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