A study of temperature dependent local atomic displacements in a Ba(Fe1-xCox)2As2 superconductor

M. Y. Hacisalihoglu; E. Paris; B. Joseph; L. Simonelli; T. J. Sato; T. Mizokawa; N. L. Saini

doi:10.1039/c5cp07985c

A study of temperature dependent local atomic displacements in a Ba(Fe_1-xCo_x)₂As₂ superconductor

M. Y. Hacisalihoglu, E. Paris, B. Joseph, L. Simonelli, T. J. Sato, T. Mizokawa, N. L. Saini

IMRAM - Division of Inorganic Material Research

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

We have studied the local structure of a Ba(Fe_1-xCo_x)₂As₂ superconductor using temperature dependent extended X-ray absorption fine structure (EXAFS) measurements. Polarized EXAFS at the Fe K-edge on an optimally doped (x = 0.06) single crystal has permitted us to determine atomic displacements across the superconducting transition temperature (T_c). The Fe-As bondlength hardly shows any change with temperature; however, the Fe-Fe sublattice reveals a sharp anomaly across T_c, indicated by a significant drop in mean square relative displacements, similar to the one known for cuprates and A15-type superconductors. We have also found a large atomic disorder around the substituted Co, revealed by polarized Co K-edge EXAFS measurements. The Co-Fe/Co bonds are more flexible than the Fe-Fe bonds with the As-height in Co-containing tetrahedra being larger than the one in FeAs₄. The results suggest that the local Fe-Fe bondlength fluctuations and the atomic disorder in this sub-lattice should have some important role in the superconductivity of Ba(Fe_1-xCo_x)₂As₂ pnictides.

Original language	English
Pages (from-to)	9029-9035
Number of pages	7
Journal	Physical Chemistry Chemical Physics
Volume	18
Issue number	13
DOIs	https://doi.org/10.1039/c5cp07985c
Publication status	Published - 2016 Apr 7

Access to Document

10.1039/c5cp07985c

Cite this

@article{14ede2858df24237baf8ddb819871b6a,

title = "A study of temperature dependent local atomic displacements in a Ba(Fe1-xCox)2As2 superconductor",

abstract = "We have studied the local structure of a Ba(Fe1-xCox)2As2 superconductor using temperature dependent extended X-ray absorption fine structure (EXAFS) measurements. Polarized EXAFS at the Fe K-edge on an optimally doped (x = 0.06) single crystal has permitted us to determine atomic displacements across the superconducting transition temperature (Tc). The Fe-As bondlength hardly shows any change with temperature; however, the Fe-Fe sublattice reveals a sharp anomaly across Tc, indicated by a significant drop in mean square relative displacements, similar to the one known for cuprates and A15-type superconductors. We have also found a large atomic disorder around the substituted Co, revealed by polarized Co K-edge EXAFS measurements. The Co-Fe/Co bonds are more flexible than the Fe-Fe bonds with the As-height in Co-containing tetrahedra being larger than the one in FeAs4. The results suggest that the local Fe-Fe bondlength fluctuations and the atomic disorder in this sub-lattice should have some important role in the superconductivity of Ba(Fe1-xCox)2As2 pnictides.",

author = "Hacisalihoglu, {M. Y.} and E. Paris and B. Joseph and L. Simonelli and Sato, {T. J.} and T. Mizokawa and Saini, {N. L.}",

note = "Funding Information: We thank the ESRF staff for the assistance during the measurements. One of us (M. Y. H.) would like to thank Sapienza University for the hospitality. M. Y. H. also acknowledges TUBITAK BIDEB foundation for the fellowship. We would like to thank Mr R. Morinaga for the contribution at the early stage of work. The work is supported by the Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (23244068 and 23340097). The work at Sapienza is partially supported by PRIN2012 (grant number 2012X3YFZ2) of MIUR, Italy. Publisher Copyright: {\textcopyright} the Owner Societies 2016.",

year = "2016",

month = apr,

day = "7",

doi = "10.1039/c5cp07985c",

language = "English",

volume = "18",

pages = "9029--9035",

journal = "Physical Chemistry Chemical Physics",

issn = "1463-9076",

publisher = "Royal Society of Chemistry",

number = "13",

}

TY - JOUR

T1 - A study of temperature dependent local atomic displacements in a Ba(Fe1-xCox)2As2 superconductor

AU - Hacisalihoglu, M. Y.

AU - Paris, E.

AU - Joseph, B.

AU - Simonelli, L.

AU - Sato, T. J.

AU - Mizokawa, T.

AU - Saini, N. L.

N1 - Funding Information: We thank the ESRF staff for the assistance during the measurements. One of us (M. Y. H.) would like to thank Sapienza University for the hospitality. M. Y. H. also acknowledges TUBITAK BIDEB foundation for the fellowship. We would like to thank Mr R. Morinaga for the contribution at the early stage of work. The work is supported by the Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (23244068 and 23340097). The work at Sapienza is partially supported by PRIN2012 (grant number 2012X3YFZ2) of MIUR, Italy. Publisher Copyright: © the Owner Societies 2016.

PY - 2016/4/7

Y1 - 2016/4/7

N2 - We have studied the local structure of a Ba(Fe1-xCox)2As2 superconductor using temperature dependent extended X-ray absorption fine structure (EXAFS) measurements. Polarized EXAFS at the Fe K-edge on an optimally doped (x = 0.06) single crystal has permitted us to determine atomic displacements across the superconducting transition temperature (Tc). The Fe-As bondlength hardly shows any change with temperature; however, the Fe-Fe sublattice reveals a sharp anomaly across Tc, indicated by a significant drop in mean square relative displacements, similar to the one known for cuprates and A15-type superconductors. We have also found a large atomic disorder around the substituted Co, revealed by polarized Co K-edge EXAFS measurements. The Co-Fe/Co bonds are more flexible than the Fe-Fe bonds with the As-height in Co-containing tetrahedra being larger than the one in FeAs4. The results suggest that the local Fe-Fe bondlength fluctuations and the atomic disorder in this sub-lattice should have some important role in the superconductivity of Ba(Fe1-xCox)2As2 pnictides.

AB - We have studied the local structure of a Ba(Fe1-xCox)2As2 superconductor using temperature dependent extended X-ray absorption fine structure (EXAFS) measurements. Polarized EXAFS at the Fe K-edge on an optimally doped (x = 0.06) single crystal has permitted us to determine atomic displacements across the superconducting transition temperature (Tc). The Fe-As bondlength hardly shows any change with temperature; however, the Fe-Fe sublattice reveals a sharp anomaly across Tc, indicated by a significant drop in mean square relative displacements, similar to the one known for cuprates and A15-type superconductors. We have also found a large atomic disorder around the substituted Co, revealed by polarized Co K-edge EXAFS measurements. The Co-Fe/Co bonds are more flexible than the Fe-Fe bonds with the As-height in Co-containing tetrahedra being larger than the one in FeAs4. The results suggest that the local Fe-Fe bondlength fluctuations and the atomic disorder in this sub-lattice should have some important role in the superconductivity of Ba(Fe1-xCox)2As2 pnictides.

UR - http://www.scopus.com/inward/record.url?scp=84962205059&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84962205059&partnerID=8YFLogxK

U2 - 10.1039/c5cp07985c

DO - 10.1039/c5cp07985c

M3 - Article

AN - SCOPUS:84962205059

SN - 1463-9076

VL - 18

SP - 9029

EP - 9035

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 13

ER -

A study of temperature dependent local atomic displacements in a Ba(Fe_1-xCo_x)₂As₂ superconductor

Abstract

Access to Document

Other files and links

Fingerprint

Cite this