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Structural, magnetic, and electronic evolution of the spin-ladder system BaFe2S3-xSex with isoelectronic substitution

Journal Article · · Physical Review B
 [1];  [1];  [2];  [1];  [1];  [1];  [3];  [4];  [5];  [6];  [7];  [8];  [7];  [3]
  1. Sun Yat-sen Univ., Guangzhou, GD (United States)
  2. Brigham Young Univ., Provo, UT (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of California, Berkeley, CA (United States); Rice Univ., Houston, TX (United States)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States)
  6. Univ. of California, Berkeley, CA (United States)
  7. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations
We reWe report experimental studies of a series of BaF e2 S3 - x Sex ( 0 ≤ $$x$$ ≤ 3 ) single crystals and powder specimens using x-ray diffraction, neutron-diffraction, muon-spin-relaxation, and electrical transport measurements. A structural transformation from $$C$$$mcm$ ( BaFe2Se3 ) to $$P$$$nma$ ( BaFe2Se3) was identified around $$x$$ = 0.7 - 1 . Neutron-diffraction measurements on the samples with $$x$$ = 0.2, 0.4, and 0.7 reveal that the Néel temperature of the stripe antiferromagnetic order is gradually suppressed from ~120 to 85 K, while the magnitude of the ordered Fe2+ moments shows very little variation. Similarly, the block antiferromagnetic order in BaFe2Se3 remains robust for 1.5 ≤ $$x$$ ≤ 3 with negligible variation in the ordered moment and a slight decrease of the Néel temperature from 250 K ( $$x$$ = 3 ) to 225 K ( $$x$$ = 1.5 ). The sample with $$x$$ = 1 near the $$C$$$mcm$ and $$P$$$nma$ border shows coexisting, two-dimensional, short-range stripe- and block-type antiferromagnetic correlations. The system remains insulating for all $$x$$ , but the thermal activation gap shows an abrupt increase when traversing the boundary from the $$C$$$mcm$ stripe phase to the $$P$$$nma$ block phase. The results demonstrate that the crystal structure, magnetic order, and electronic properties are strongly coupled in the BaFe2S3-x Sex system.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Natural Science Foundation of China (NNSFC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1650109
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 23 Vol. 101; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Antiferromagnetism
antiferromagnets
iron-based superconductors
magnetic phase transitions
magnetic semiconductors
muon spin relaxation & rotation
neutron diffraction
resistivity measurements
x-ray diffraction