Large asymmetric anomalous Nernst effect in the antiferromagnet SrIr0.8Sn0.2O3
Journal Article
·
· Nature Communications
- Univ. of Tennessee, Knoxville, TN (United States); Chinese Academy of Sciences (CAS), Beijing (China)
- Univ. of Tennessee, Knoxville, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
- Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
- Univ. of Tennessee, Knoxville, TN (United States)
- Cornell Univ., Ithaca, NY (United States)
- Charles Univ., Prague (Czech Republic)
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Chinese Academy of Sciences (CAS), Hefei (China)
A large anomalous Nernst effect is essential for thermoelectric energy-harvesting in the transverse geometry without external magnetic field. It's often connected with anomalous Hall effect, especially when electronic Berry curvature is believed to be the driving force. This approach implicitly assumes the same symmetry for the Nernst and Hall coefficients, which is however not necessarily true. Here we report a large anomalous Nernst effect in antiferromagnetic SrIr0.8Sn0.2O3 that defies the antisymmetric constraint on the anomalous Hall effect imposed by the Onsager reciprocal relation. The observed spontaneous Nernst thermopower quickly reaches the sub-μV/K level below the Néel transition around 250 K, which is comparable with many topological antiferromagnetic semimetals and far excels other magnetic oxides. Our analysis indicates that the coexistence of significant symmetric and antisymmetric contributions plays a key role, pointing to the importance of extracting both contributions and a new pathway to enhanced anomalous Nernst effect for transverse thermoelectrics.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC02-06CH11357; SC0020254
- OSTI ID:
- 2587355
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 16; ISSN 2041-1723
- Publisher:
- Springer Science and Business Media LLCCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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