Electronic properties of the bulk and surface states of Fe1+yTe1-xSex

Li, Yangmu; Zaliznyak, Igor A.; Zaki, Nader; Garlea, Vasile O.; Savici, Andrei T.; Fobes, David; Xu, Zhijun; Camino, Fernando; Petrovic, Cedomir; Gu, Genda; Johnson, Peter; Tranquada, John

doi:10.1038/s41563-021-00984-7

Electronic properties of the bulk and surface states of Fe_1+yTe_1-xSe_x

Journal Article · Thu Apr 22 00:00:00 EDT 2021 · Nature Materials

DOI:https://doi.org/10.1038/s41563-021-00984-7· OSTI ID:1782553

^[1]; ^[1]; Zaki, Nader ^[1]; ^[2]; ^[2]; Fobes, David ^[1]; Xu, Zhijun ^[3]; Camino, Fernando ^[4]; Petrovic, Cedomir ^[1]; Gu, Genda ^[1]; Johnson, Peter ^[1]; Tranquada, John ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)

The idea of employing non-Abelian statistics for error-free quantum computing ignited interest in reports of topological surface superconductivity and Majorana zero modes (MZMs) in FeTe_0.55Se_0.45. However, the topological features and superconducting properties are not observed uniformly across the sample surface. The understanding and practical control of these electronic inhomogeneities present a prominent challenge for potential applications. Here, we combine neutron scattering, scanning angle-resolved photoemission spectroscopy, and microprobe composition and resistivity measurements to characterize the electronic state of Fe_1+yTe_1-xSe_x. Furthermore, we establish a phase diagram in which the superconductivity is observed only at sufficiently low Fe concentration, in association with distinct antiferromagnetic correlations, whereas the coexisting topological surface state occurs only at sufficiently high Te concentration. We find that FeTe_0.55Se_0.45 is located very close to both phase boundaries, which explains the inhomogeneity of superconducting and topological states. Our results demonstrate the compositional control required for use of topological MZMs in practical applications.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0012704

OSTI ID:: 1782553

Alternate ID(s):: OSTI ID: 1818701

Report Number(s):: BNL--221384-2021-JAAM

Journal Information:: Nature Materials, Journal Name: Nature Materials Journal Issue: 9 Vol. 20; ISSN 1476-1122

Publisher:: Springer Nature - Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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