skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Phase Diagram of K x Fe 2 - y Se 2 - z S z and the Suppression of its Superconducting State by an Fe 2 - Se / S Tetrahedron Distortion

Abstract

We report structurally tuned superconductivity in a K x Fe 2 - y Se 2 - z S z ( 0 ≤ z ≤ 2 ) phase diagram. Superconducting T c is suppressed as S is incorporated into the lattice, eventually vanishing at 80% of S. The magnetic and conductivity properties can be related to stoichiometry on a poorly occupied Fe1 site and the local environment of a nearly fully occupied Fe2 site. The decreasing T c coincides with the increasing Fe1 occupancy and the overall increase in Fe stoichiometry from z = 0 to z = 2 . Our results indicate that the irregularity of the Fe 2 - Se / S tetrahedron is an important controlling parameter that can be used to tune the ground state in the new superconductor family.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1385599
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 13; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; phonons, thermal conductivity, energy storage (including batteries and capacitors), superconductivity, defects, spin dynamics

Citation Formats

Lei, Hechang, Abeykoon, Milinda, Bozin, Emil S., Wang, Kefeng, Warren, J. B., and Petrovic, C. Phase Diagram of KxFe2-ySe2-zSz and the Suppression of its Superconducting State by an Fe2-Se/S Tetrahedron Distortion. United States: N. p., 2011. Web. doi:10.1103/PhysRevLett.107.137002.
Lei, Hechang, Abeykoon, Milinda, Bozin, Emil S., Wang, Kefeng, Warren, J. B., & Petrovic, C. Phase Diagram of KxFe2-ySe2-zSz and the Suppression of its Superconducting State by an Fe2-Se/S Tetrahedron Distortion. United States. doi:10.1103/PhysRevLett.107.137002.
Lei, Hechang, Abeykoon, Milinda, Bozin, Emil S., Wang, Kefeng, Warren, J. B., and Petrovic, C. Thu . "Phase Diagram of KxFe2-ySe2-zSz and the Suppression of its Superconducting State by an Fe2-Se/S Tetrahedron Distortion". United States. doi:10.1103/PhysRevLett.107.137002.
@article{osti_1385599,
title = {Phase Diagram of KxFe2-ySe2-zSz and the Suppression of its Superconducting State by an Fe2-Se/S Tetrahedron Distortion},
author = {Lei, Hechang and Abeykoon, Milinda and Bozin, Emil S. and Wang, Kefeng and Warren, J. B. and Petrovic, C.},
abstractNote = {We report structurally tuned superconductivity in a K x Fe 2 - y Se 2 - z S z ( 0 ≤ z ≤ 2 ) phase diagram. Superconducting T c is suppressed as S is incorporated into the lattice, eventually vanishing at 80% of S. The magnetic and conductivity properties can be related to stoichiometry on a poorly occupied Fe1 site and the local environment of a nearly fully occupied Fe2 site. The decreasing T c coincides with the increasing Fe1 occupancy and the overall increase in Fe stoichiometry from z = 0 to z = 2 . Our results indicate that the irregularity of the Fe 2 - Se / S tetrahedron is an important controlling parameter that can be used to tune the ground state in the new superconductor family.},
doi = {10.1103/PhysRevLett.107.137002},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 13,
volume = 107,
place = {United States},
year = {2011},
month = {9}
}

Works referenced in this record:

Spin-glass behavior of semiconducting K x Fe 2 y S 2
journal, May 2011


Superconductivity up to 30 K in the vicinity of the quantum critical point in BaFe 2 (As 1− x P x ) 2
journal, August 2009


Electronic structure and Fermi surface of new K intercalated iron selenide superconductor KxFe2Se2
journal, February 2011


Physical properties of quaternary mixed transition metal sulfides: ACuFeS2 (A = K, Rb, Cs)
journal, December 1996


Superconductivity in the iron selenide K x Fe 2 Se 2 ( 0 x 1.0 )
journal, November 2010


Nodeless superconducting gap in AxFe2Se2 (A=K,Cs) revealed by angle-resolved photoemission spectroscopy
journal, February 2011

  • Zhang, Y.; Yang, L. X.; Xu, M.
  • Nature Materials, Vol. 10, Issue 4
  • DOI: 10.1038/nmat2981

Anisotropy in transport and magnetic properties of K 0 . 64 Fe 1 . 44 Se 2
journal, May 2011


Tellurium substitution effect on superconductivity of the α-phase iron selenide
journal, October 2008


Se 77 NMR investigation of the K x Fe 2 y Se 2 high- T c superconductor ( T c = 33 K)
journal, March 2011


EXPGUI , a graphical user interface for GSAS
journal, April 2001


Anion height dependence of T c for the Fe-based superconductor
journal, April 2010


Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO 1 x F x
journal, July 2008


Fe-based superconductivity with T c =31 K bordering an antiferromagnetic insulator in (Tl,K) Fe x Se 2
journal, April 2011


Room temperature antiferromagnetic order in superconducting X y Fe 2 − x Se 2 (X = Rb, K): a neutron powder diffraction study
journal, April 2011

  • Pomjakushin, V. Yu; Pomjakushina, E. V.; Krzton-Maziopa, A.
  • Journal of Physics: Condensed Matter, Vol. 23, Issue 15
  • DOI: 10.1088/0953-8984/23/15/156003

Iron-vacancy superstructure and possible room-temperature antiferromagnetic order in superconducting Cs y Fe 2 x Se 2
journal, April 2011

  • Pomjakushin, V. Yu.; Sheptyakov, D. V.; Pomjakushina, E. V.
  • Physical Review B, Vol. 83, Issue 14
  • DOI: 10.1103/PhysRevB.83.144410

Magnetic order close to superconductivity in the iron-based layered LaO1-xF x FeAs systems
journal, May 2008

  • de la Cruz, Clarina; Huang, Q.; Lynn, J. W.
  • Nature, Vol. 453, Issue 7197
  • DOI: 10.1038/nature07057

Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO 1- y (Ln = La, Nd)
journal, August 2008

  • Lee, Chul-Ho; Iyo, Akira; Eisaki, Hiroshi
  • Journal of the Physical Society of Japan, Vol. 77, Issue 8
  • DOI: 10.1143/JPSJ.77.083704

Unconventional Pairing Originating from the Disconnected Fermi Surfaces of Superconducting LaFeAsO 1 x F x
journal, August 2008


Effect of varying iron content on the transport properties of the potassium-intercalated iron selenide K x Fe 2 y Se 2
journal, April 2011


Observation of Fermi-surface–dependent nodeless superconducting gaps in Ba 0.6 K 0.4 Fe 2 As 2
journal, July 2008