Superconductivity in undoped BaFe2As2 by tetrahedral geometry design

Kang, Jong-Hoon1; Kim, Jong-Woo2; Ryan, Philip J.2,3; Xie, Lin4; Guo, Lu1; Sundahl, Chris1; Schad, Jonathon1; Campbell, Neil5; Collantes, Yesusa G.6; Hellstrom, Eric E.6; Rzchowski, Mark S.5; Eom, Chang-Beom1

2020-09

10.1073/pnas.2001123117

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   影响因子和分区

0027-8424

Fe-based superconductors exhibit a diverse interplay between charge, orbital, and magnetic ordering. Variations in atomic geometry affect electron hopping between Fe atoms and the Fermi surface topology, influencing magnetic frustration and the pairing strength through changes of orbital overlap and occupancies. Here, we experimentally demonstrate a systematic approach to realize superconductivity without chemical doping in BaFe2As2, employing geometric design within an epitaxial heterostructure. We control both tetragonality and orthorhombicity in BaFe2As2 through superlattice engineering, which we experimentally find to induce superconductivity when the As-Fe-As bond angle approaches that in a regular tetrahedron. This approach to superlattice design could lead to insights into low-dimensional superconductivity in Fe-based superconductors.

superconductivity atomic geometry epitaxial heterostructure low-dimension superlattice

SCI

英语

NI论文

其他

US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences[DEFG02-06ER46327] ; DOE Office of Science[DE-AC02-06CH11357] ; [NSF-DMR-1644779]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:000572321800002

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BIOLOGY & BIOCHEMISTRY;CLINICAL MEDICINE;MULTIDISCIPLINARY;PLANT & ANIMAL SCIENCE;ENVIRONMENT/ECOLOGY;SOCIAL SCIENCES, GENERAL;MICROBIOLOGY;ECONOMICS BUSINESS;IMMUNOLOGY;MATERIALS SCIENCE;MATHEMATICS;SPACE SCIENCE;MOLECULAR BIOLOGY & GENETICS;PHARMACOLOGY & TOXICOLOGY;CHEMISTRY;PSYCHIATRY/PSYCHOLOGY;NEUROSCIENCE & BEHAVIOR;PHYSICS;GEOSCIENCES;AGRICULTURAL SCIENCES;ENGINEERING

Web of Science

1.Univ Wisconsin Madison, Dept Mat Sci & Engn, Madison, WI 53706 USA
2.Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
3.Dublin City Univ, Sch Phys Sci, Dublin 9, Ireland
4.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
5.Univ Wisconsin Madison, Dept Phys, Madison, WI 53706 USA
6.Florida State Univ, Natl High Magnet Field Lab, Appl Superconduct Ctr, Tallahassee, FL 32310 USA

Kang, Jong-Hoon,Kim, Jong-Woo,Ryan, Philip J.,et al. Superconductivity in undoped BaFe2As2 by tetrahedral geometry design[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2020,117(35):21170-21174.

Kang, Jong-Hoon.,Kim, Jong-Woo.,Ryan, Philip J..,Xie, Lin.,Guo, Lu.,...&Eom, Chang-Beom.(2020).Superconductivity in undoped BaFe2As2 by tetrahedral geometry design.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(35),21170-21174.

Kang, Jong-Hoon,et al."Superconductivity in undoped BaFe2As2 by tetrahedral geometry design".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.35(2020):21170-21174.