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Sequential structural and antiferromagnetic transitions in BaFe2Se3 under pressure

Journal Article · · Physical Review B
 [1];  [1];  [1];  [2];  [1]
  1. Southeast Univ., Nanjing (China). School of Physics
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
We present the discovery of superconductivity in the two-leg ladder compound BaFe2S3 has established the 123-type iron chalcogenides as a novel and interesting subgroup of the iron-based superconductor family. However, in this 123 series, BaFe2Se3 is an exceptional member, with a magnetic order and crystalline structure different from all others. Recently, an exciting experiment reported the emergence of superconductivity in BaFe2Se3 at high pressure [J. Ying et al., Phys. Rev. B 95, 241109(R) (2017)]. In this paper, we report a first-principles study of BaFe2Se3. Our analysis unveils a variety of qualitative differences between BaFe2S3 and BaFe2Se3, including in the latter an unexpected chain of transitions with increasing pressure. First, by gradually reducing the tilting angle of iron ladders, the crystalline structure smoothly transforms from Pnma to Cmcm at ~6 GPa. Second, the system becomes metallic at 10.4 GPa. Third, its unique ambient-pressure Block antiferromagnetic ground state is replaced by the more common stripe (so-called CX-type) antiferromagnetic order at ~12 GPa, the same magnetic state as the 123-S ladder. This transition is found at a pressure very similar to the experimental superconducting transition. Finally, all magnetic moments vanish at 30 GPa. This reported theoretical diagram of the complete phase evolution is important because of the technical challenges to capture many physical properties in high-pressure experiments. The information obtained in our calculations suggests different characteristics for superconductivity in BaFe2Se3 and BaFe2S3: in 123-S pairing occurs when magnetic moments vanish, while in 123-Se the transition region from Block- to CX-type magnetism appears to catalyze superconductivity. Lastly, an additional superconducting dome above ~30 GPa is expected to occur.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1422584
Alternate ID(s):
OSTI ID: 1417069
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 4 Vol. 97; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Iron-Based Chalcogenide Spin Ladder BaFe2X3 (X = Se,S) journal November 2019
Spin dynamics of the block orbital-selective Mott phase journal September 2018
Fingerprints of an orbital-selective Mott phase in the block magnetic state of BaFe2Se3 ladders journal June 2019
New iron-based multiferroics with improper ferroelectricity journal May 2018
Spin interactions and magnetic order in the iron oxychalcogenides BaFe 2 Q 2 O ( Q = S and Se ) journal July 2019
Magnetic states of iron-based two-leg ladder tellurides journal November 2019
Robust block magnetism in the spin ladder compound BaFe 2 Se 3 under hydrostatic pressure journal December 2019
Gradual enhancement of stripe-type antiferromagnetism in the spin-ladder material BaFe 2 S 3 under pressure journal November 2018
Polar state induced by block-type lattice distortions in BaFe 2 Se 3 with quasi-one-dimensional ladder structure journal June 2019
Strong electronic correlations and Fermi surface reconstruction in the quasi-one-dimensional iron superconductor BaFe 2 S 3 journal January 2019
Fingerprints of an Exotic Orbital-Selective Mott Phase in the Block Magnetic State of BaFe$_2$Se$_3$ Ladders text January 2018

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