Insulating and metallic spin glass in KxFe2-δ-yNiySe2 (0.06 ≤ y ≤ 1.44 ) single crystals

Ryu, Hyejin; Abeykoon, Milinda; Wang, Kefeng; Lei, Hechang; Lazarevic, N.; Warren, J. B.; Bozin, E. S.; Popovic, Z. V.; Petrovic, C.

doi:10.1103/PhysRevB.91.184503

Insulating and metallic spin glass in K_xFe_2-δ-yNi_ySe₂ (0.06 ≤ y ≤ 1.44 ) single crystals

Journal Article · Mon May 04 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.184503· OSTI ID:1193231

Ryu, Hyejin ^[1]; Abeykoon, Milinda ^[2]; Wang, Kefeng ^[2]; Lei, Hechang ^[2]; Lazarevic, N. ^[3]; Warren, J. B. ^[2]; Bozin, E. S. ^[2]; Popovic, Z. V. ^[3]; Petrovic, C. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Belgrade, Belgrade (Serbia)

We report electron doping effects by Ni in K_xFe_2-δ-yNi_ySe₂ (0.06 ≤ y ≤ 1.44) single crystal alloys. A rich ground state phase diagram is observed. Thus, a small amount of Ni (~ 4%) suppressed superconductivity below 1.8 K, inducing insulating spin glass magnetic ground state for higher Ni content. With further Ni substitution, metallic resistivity is restored. For high Ni concentration in the lattice the unit cell symmetry is high symmetry I4/mmm with no phase separation whereas both I4/m + I4/mmm space groups were detected in the phase separated crystals when concentration of Ni < Fe. The absence of superconductivity coincides with the absence of crystalline Fe vacancy order.

View Accepted Manuscript (DOE)

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) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1193231

Alternate ID(s):: OSTI ID: 1229162
OSTI ID: 1179694

Report Number(s):: BNL--108122-2015-JA; KC0201050

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 18 Vol. 91; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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