Sustained phase separation and spin glass in Co-doped KxFe2-ySe2 single crystals

Ryu, Hyejin; Wang, Kefeng; Opacic, M.; Lazarevic, N.; Warren, J. B.; Popovic, Z. V.; Bozin, Emil S.; Petrovic, C.

doi:10.1103/PhysRevB.92.174522

Title: Sustained phase separation and spin glass in Co-doped $K_{x} {Fe}_{2 - y} {Se}_{2}$ single crystals

Journal Article · Thu Nov 19 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.174522· OSTI ID:1240589

Ryu, Hyejin ^[1]; Wang, Kefeng ^[2]; Opacic, M. ^[3]; Lazarevic, N. ^[3]; Warren, J. B. ^[4]; Popovic, Z. V. ^[4]; Bozin, Emil S. ^[2]; Petrovic, C. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Univ. of Belgrade, Belgrade (Serbia)
Brookhaven National Lab. (BNL), Upton, NY (United States)

We describe Co substitution effects in K_xFe_2-y-zCo_zSe₂ (0.06 ≤ z ≤ 1.73) single crystal alloys. By 3.5% of Co doping superconductivity is suppressed whereas phase separation of semiconducting K₂Fe₄Se₅ and superconducting/metallic K_xFe₂Se₂ is still present. We show that the arrangement and distribution of superconducting phase (stripe phase) is connected with the arrangement of K, Fe and Co atoms. Semiconducting spin glass is found in proximity to superconducting state, persisting for large Co concentrations. At high Co concentrations ferromagnetic metallic state emerges above the spin glass. This is coincident with changes of the unit cell, arrangement and connectivity of stripe conducting phase.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

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

Grant/Contract Number:: SC0012704; SC00112704

OSTI ID:: 1240589

Alternate ID(s):: OSTI ID: 1546123

Report Number(s):: BNL-111749-2016-JA; PRBMDO; R&D Project: PM016; PO011; KC0201050; KC0201060

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 17; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Title: Sustained phase separation and spin glass in Co-doped $K_{x} {Fe}_{2 - y} {Se}_{2}$ single crystals