Mechanically-induced disorder in CaFe2As2: A 57Fe Mössbauer study

Ma, Xiaoming; Ran, Sheng; Canfield, Paul C.; Bud'ko, Sergey L.

doi:10.1016/j.jallcom.2015.10.128

Mechanically-induced disorder in CaFe₂As₂: A ⁵⁷Fe Mössbauer study

Journal Article · Sat Oct 17 00:00:00 EDT 2015 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2015.10.128· OSTI ID:1239159

Ma, Xiaoming ^[1]; Ran, Sheng ^[2]; Canfield, Paul C. ^[2]; Bud'ko, Sergey L. ^[2]

Iowa State Univ., Ames, IA (United States); Lanzhou Univ., Gansu Province (China)
Iowa State Univ., Ames, IA (United States)

⁵⁷Fe Mössbauer spectroscopy was used to perform a microscopic study on the extremely pressure and strain sensitive compound, CaFe₂As₂, with different degrees of strain introduced by grinding and annealing. At the base temperature, in the antiferromagnetic/orthorhombic phase, compared to a sharp sextet Mössbauer spectrum of single crystal CaFe₂As₂, which is taken as an un-strained sample, an obviously broadened sextet and an extra doublet were observed for ground CaFe₂As₂ powders with different degrees of strain. The Mössbauer results suggest that the magnetic phase transition of CaFe₂As₂ can be inhomogeneously suppressed by the grinding induced strain to such an extent that the antiferromagnetic order in parts of the grains forming the powdered sample remain absent all the way down to 4.6 K. However, strain has almost no effect on the temperature dependent hyperfine magnetic field in the grains with magnetic order. Additional electronic and asymmetry information was obtained from the isomer shift and quadrupole splitting. Similar isomer shift values in the magnetic phase for samples with different degrees of strain, indicate that the stain does not bring any significant variation of the electronic density at ⁵⁷Fe nucleus position. As a result, the absolute values of quadrupole shift in the magnetic phase decrease and approach zero with increasing degrees of strain, indicating that the strain reduces the average lattice asymmetry at Fe atom position.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1239159

Alternate ID(s):: OSTI ID: 22748791
OSTI ID: 1397528

Report Number(s):: IS-J--8903; PII: S0925838815313840

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Journal Issue: C Vol. 657; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

⁵⁷ Fe Mössbauer study of stoichiometric iron-based superconductor CaKFe ₄ As ₄ : a comparison to KFe ₂ As ₂ and CaFe ₂ As ₂ Bud’ko, Sergey L.; Kong, Tai; Meier, William R. Philosophical Magazine, Vol. 97, Issue 29 https://doi.org/10.1080/14786435.2017.1347726	journal	July 2017
Transition to collapsed tetragonal phase in CaFe 2 As 2 single crystals as seen by Fe 57 Mössbauer spectroscopy Bud'ko, Sergey L.; Ma, Xiaoming; Tomić, Milan Physical Review B, Vol. 93, Issue 2 https://doi.org/10.1103/physrevb.93.024516	journal	January 2016

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Related Subjects

36 MATERIALS SCIENCE
CaFe2As2
Mossbauer spectroscopy
magnetism
strain