The effects of post-growth annealing on the structural and magnetic properties of BaFe2As2

Forrest, T. R.; Valdivia, P. N.; Rotundu, C. R.; Bourret-Courchesne, E.; Birgeneau, R. J.

doi:10.1088/0953-8984/28/11/115702

Title: The effects of post-growth annealing on the structural and magnetic properties of BaFe₂As₂

Abstract

Here, we investigate the effects of post-growth annealing on the structural and magnetic properties of BaFe₂As₂. Magnetic susceptibility measurements, which exhibit a signal corresponding to the magnetic phase transition, and high-resolution x-ray diffraction measurements, which directly probe the structural order parameter, show that annealing causes the ordering temperatures of both the phase transitions to increase, sharpen and converge. In the as grown sample, our measurements show two distinct transitions corresponding to structural and magnetic ordering, which are separated in temperature by approximately 1 K. After 46 days (d) of annealing at 700 °C, the two become concurrent in temperature. These measurements demonstrate that the structural phase transition is second-order like when the magnetic and structural phase transitions are separated in temperature, and first-order like when the two phase transition temperatures coincide. This observation indicates that annealing causes the system to cross a hitherto undiscovered tricritical point. In addition, x-ray diffraction measurements show that the c-axis lattice parameter increases with annealing up to 30 d, but remains constant for longer annealing times. Comparisons of BaFe₂As₂ to SrFe₂As₂ are made when possible.

Authors:

Forrest, T. R. ^[1]; Valdivia, P. N. ^[2]; Rotundu, C. R. ^[3]; Bourret-Courchesne, E. ^[4]; Birgeneau, R. J. ^[5]

Univ. of California, Berkeley, CA (United States); European Synchrotron Radiation Facility, Grenoble Cedex (France)
Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Publication Date:: Fri Feb 19 00:00:00 EST 2016

Research Org.:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1466692

Alternate Identifier(s):: OSTI ID: 1238403

Grant/Contract Number:: AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physics. Condensed Matter

Additional Journal Information:: Journal Volume: 28; Journal Issue: 11; Related Information: © 2016 IOP Publishing Ltd.; Journal ID: ISSN 0953-8984

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Superconductivity; Iron-pnictides; Structural phase transition

Citation Formats


                    Forrest, T. R., Valdivia, P. N., Rotundu, C. R., Bourret-Courchesne, E., and Birgeneau, R. J. The effects of post-growth annealing on the structural and magnetic properties of BaFe2As2.  United States: N. p., 2016. 
Web.  doi:10.1088/0953-8984/28/11/115702.

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                    Forrest, T. R., Valdivia, P. N., Rotundu, C. R., Bourret-Courchesne, E., & Birgeneau, R. J. The effects of post-growth annealing on the structural and magnetic properties of BaFe2As2.  United States.  https://doi.org/10.1088/0953-8984/28/11/115702

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                    Forrest, T. R., Valdivia, P. N., Rotundu, C. R., Bourret-Courchesne, E., and Birgeneau, R. J. Fri .  
"The effects of post-growth annealing on the structural and magnetic properties of BaFe2As2".  United States.  https://doi.org/10.1088/0953-8984/28/11/115702.  https://www.osti.gov/servlets/purl/1466692.

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@article{osti_1466692,

  title        = {The effects of post-growth annealing on the structural and magnetic properties of BaFe2As2},

  author       = {Forrest, T. R. and Valdivia, P. N. and Rotundu, C. R. and Bourret-Courchesne, E. and Birgeneau, R. J.},

  abstractNote = {Here, we investigate the effects of post-growth annealing on the structural and magnetic properties of BaFe2As2. Magnetic susceptibility measurements, which exhibit a signal corresponding to the magnetic phase transition, and high-resolution x-ray diffraction measurements, which directly probe the structural order parameter, show that annealing causes the ordering temperatures of both the phase transitions to increase, sharpen and converge. In the as grown sample, our measurements show two distinct transitions corresponding to structural and magnetic ordering, which are separated in temperature by approximately 1 K. After 46 days (d) of annealing at 700 °C, the two become concurrent in temperature. These measurements demonstrate that the structural phase transition is second-order like when the magnetic and structural phase transitions are separated in temperature, and first-order like when the two phase transition temperatures coincide. This observation indicates that annealing causes the system to cross a hitherto undiscovered tricritical point. In addition, x-ray diffraction measurements show that the c-axis lattice parameter increases with annealing up to 30 d, but remains constant for longer annealing times. Comparisons of BaFe2As2 to SrFe2As2 are made when possible.},

  doi          = {10.1088/0953-8984/28/11/115702},

  journal      = {Journal of Physics. Condensed Matter},

  number       = 11,

  volume       = 28,

  place        = {United States},

  year         = {Fri Feb 19 00:00:00 EST 2016},

  month        = {Fri Feb 19 00:00:00 EST 2016}

}

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Works referenced in this record:

Iron-Based Layered Superconductor La[O _1- _x F _x ]FeAs ( x = 0.05−0.12) with T _c = 26 K
journal, March 2008

Kamihara, Yoichi; Watanabe, Takumi; Hirano, Masahiro
Journal of the American Chemical Society, Vol. 130, Issue 11
DOI: 10.1021/ja800073m

Superconductivity at 38 K in the Iron Arsenide $({Ba}_{1 - x} K_{x}) {Fe}_{2} {As}_{2}$
journal, September 2008

Rotter, Marianne; Tegel, Marcus; Johrendt, Dirk
Physical Review Letters, Vol. 101, Issue 10
DOI: 10.1103/PhysRevLett.101.107006

LiFeAs: An intrinsic FeAs-based superconductor with $T_{c} = 18 K$
journal, August 2008

Tapp, Joshua H.; Tang, Zhongjia; Lv, Bing
Physical Review B, Vol. 78, Issue 6
DOI: 10.1103/PhysRevB.78.060505

Transition of stoichiometric ${Sr}_{2} {VO}_{3} FeAs$ to a superconducting state at 37.2 K
journal, June 2009

Zhu, Xiyu; Han, Fei; Mu, Gang
Physical Review B, Vol. 79, Issue 22
DOI: 10.1103/PhysRevB.79.220512

Superconductivity at 22 K in Co-Doped ${BaFe}_{2} {As}_{2}$ Crystals
journal, September 2008

Sefat, Athena S.; Jin, Rongying; McGuire, Michael A.
Physical Review Letters, Vol. 101, Issue 11
DOI: 10.1103/PhysRevLett.101.117004

Superconducting State in ${SrFe}_{2 - x} {Co}_{x} {As}_{2}$ by Internal Doping of the Iron Arsenide Layers
journal, November 2008

Leithe-Jasper, A.; Schnelle, W.; Geibel, C.
Physical Review Letters, Vol. 101, Issue 20
DOI: 10.1103/PhysRevLett.101.207004

Superconducting Fe-Based Compounds $(A_{1 - x} {Sr}_{x}) {Fe}_{2} {As}_{2}$ with $A = K$ and Cs with Transition Temperatures up to 37 K
journal, September 2008

Sasmal, Kalyan; Lv, Bing; Lorenz, Bernd
Physical Review Letters, Vol. 101, Issue 10
DOI: 10.1103/PhysRevLett.101.107007

Pressure Induced Superconductivity in ${CaFe}_{2} {As}_{2}$
journal, July 2008

Torikachvili, Milton S.; Bud’ko, Sergey L.; Ni, Ni
Physical Review Letters, Vol. 101, Issue 5
DOI: 10.1103/PhysRevLett.101.057006

Superconductivity up to 29 K in SrFe ₂ As ₂ and BaFe ₂ As ₂ at high pressures
journal, December 2008

Alireza, Patricia L.; Ko, Y. T. Chris; Gillett, Jack
Journal of Physics: Condensed Matter, Vol. 21, Issue 1
DOI: 10.1088/0953-8984/21/1/012208

Strain induced superconductivity in the parent compound BaFe2As2
journal, December 2013

Engelmann, J.; Grinenko, V.; Chekhonin, P.
Nature Communications, Vol. 4, Issue 1
DOI: 10.1038/ncomms3877

First-order structural phase transition in ${CaFe}_{2} {As}_{2}$
journal, July 2008

Ni, N.; Nandi, S.; Kreyssig, A.
Physical Review B, Vol. 78, Issue 1
DOI: 10.1103/PhysRevB.78.014523

Lattice and magnetic instabilities in ${CaFe}_{2} {As}_{2}$ : A single-crystal neutron diffraction study
journal, September 2008

Goldman, A. I.; Argyriou, D. N.; Ouladdiaf, B.
Physical Review B, Vol. 78, Issue 10
DOI: 10.1103/PhysRevB.78.100506

Magnetic and lattice coupling in single-crystal ${SrFe}_{2} {As}_{2}$ : A neutron scattering study
journal, August 2009

Li, Haifeng; Tian, Wei; Zarestky, Jerel L.
Physical Review B, Vol. 80, Issue 5
DOI: 10.1103/PhysRevB.80.054407

Neutron scattering investigation of the magnetic order in single crystalline BaFe ₂ As ₂
journal, May 2009

Kofu, M.; Qiu, Y.; Bao, Wei
New Journal of Physics, Vol. 11, Issue 5
DOI: 10.1088/1367-2630/11/5/055001

Neutron diffraction study of the magnetic and structural phase transitions in ${BaFe}_{2} {As}_{2}$
journal, May 2009

Wilson, Stephen D.; Yamani, Z.; Rotundu, C. R.
Physical Review B, Vol. 79, Issue 18
DOI: 10.1103/PhysRevB.79.184519

Heat capacity study of ${BaFe}_{2} {As}_{2}$ : Effects of annealing
journal, October 2010

Rotundu, C. R.; Freelon, B.; Forrest, T. R.
Physical Review B, Vol. 82, Issue 14
DOI: 10.1103/PhysRevB.82.144525

Manifestations of multiple-carrier charge transport in the magnetostructurally ordered phase of BaFe $_{2}$ As $_{2}$
journal, November 2011

Ishida, S.; Liang, T.; Nakajima, M.
Physical Review B, Vol. 84, Issue 18
DOI: 10.1103/PhysRevB.84.184514

Character of the structural and magnetic phase transitions in the parent and electron-doped BaFe $_{2}$ As $_{2}$ compounds
journal, April 2011

Kim, M. G.; Fernandes, R. M.; Kreyssig, A.
Physical Review B, Vol. 83, Issue 13
DOI: 10.1103/PhysRevB.83.134522

First- and second-order magnetic and structural transitions in BaFe $_{2 (1 - x)}$ Co $_{2 x}$ As $_{2}$
journal, September 2011

Rotundu, C. R.; Birgeneau, R. J.
Physical Review B, Vol. 84, Issue 9
DOI: 10.1103/PhysRevB.84.092501

Anisotropy in the Electrical Resistivity and Susceptibility of Superconducting ${BaFe}_{2} {As}_{2}$ Single Crystals
journal, March 2009

Wang, X. F.; Wu, T.; Wu, G.
Physical Review Letters, Vol. 102, Issue 11
DOI: 10.1103/PhysRevLett.102.117005

Determination of the phase diagram of the electron-doped superconductor $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$
journal, January 2009

Chu, Jiun-Haw; Analytis, James G.; Kucharczyk, Chris
Physical Review B, Vol. 79, Issue 1
DOI: 10.1103/PhysRevB.79.014506

Influence of quenched impurities on first-order phase transitions
journal, April 1979

Imry, Yoseph; Wortis, Michael
Physical Review B, Vol. 19, Issue 7
DOI: 10.1103/PhysRevB.19.3580

Aging effect in magnetotransport property of oxygen adsorbed BaFe2As2
conference, January 2015

Ghosh, Nilotpal; Raj, Santhosh
NANOFORUM 2014, AIP Conference Proceedings
DOI: 10.1063/1.4918037

Stabilization of an ambient-pressure collapsed tetragonal phase in CaFe $_{2}$ As $_{2}$ and tuning of the orthorhombic-antiferromagnetic transition temperature by over 70 K via control of nanoscale precipitates
journal, April 2011

Ran, S.; Bud’ko, S. L.; Pratt, D. K.
Physical Review B, Vol. 83, Issue 14
DOI: 10.1103/PhysRevB.83.144517

Control of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$
journal, June 2012

Ran, S.; Bud'ko, S. L.; Straszheim, W. E.
Physical Review B, Vol. 85, Issue 22
DOI: 10.1103/PhysRevB.85.224528

Annealing effects on the properties of BFe ₂ As ₂ (B = Ca, Sr, Ba) superconducting parents
journal, January 2014

Saparov, Bayrammurad; Sefat, Athena S.
Dalton Trans., Vol. 43, Issue 40
DOI: 10.1039/C4DT01068J

Powder x-ray diffraction of BaFe ₂ As ₂ under hydrostatic pressure
journal, December 2012

Eguchi, N.; Kodama, M.; Ishikawa, F.
Journal of Physics: Conference Series, Vol. 400, Issue 2
DOI: 10.1088/1742-6596/400/2/022017

Appearance of pressure-induced superconductivity in ${BaFe}_{2} {As}_{2}$ under hydrostatic conditions and its extremely high sensitivity to uniaxial stress
journal, June 2010

Yamazaki, Takehiro; Takeshita, Nao; Kobayashi, Ryosuke
Physical Review B, Vol. 81, Issue 22
DOI: 10.1103/PhysRevB.81.224511

Effect of Uniaxial Strain on the Structural and Magnetic Phase Transitions in ${BaFe}_{2} {As}_{2}$
journal, February 2012

Dhital, Chetan; Yamani, Z.; Tian, Wei
Physical Review Letters, Vol. 108, Issue 8
DOI: 10.1103/PhysRevLett.108.087001

Works referencing / citing this record:

Ferroelasticity, anelasticity and magnetoelastic relaxation in Co-doped iron pnictide: Ba(Fe _0.957 Co _0.043 ) ₂ As ₂
journal, February 2019

Carpenter, M. A.; Evans, D. M.; Schiemer, J. A.
Journal of Physics: Condensed Matter, Vol. 31, Issue 15
DOI: 10.1088/1361-648x/aafe29

Ferroelasticity, anelasticity and magnetoelastic relaxation in Co-doped iron pnictide: Ba(Fe0.957Co0.043)₂As₂
text, January 2019

Carpenter, M. A.; Evans, D. M.; Schiemer, J. A.
Karlsruhe
DOI: 10.5445/ir/1000092129

Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity
journal, April 2017

Li, L.; Zheng, Q.; Zou, Q.
Scientific Reports, Vol. 7, Issue 1
DOI: 10.1038/s41598-017-00984-1

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Title: The effects of post-growth annealing on the structural and magnetic properties of BaFe2As2

Abstract

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