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

Journal Article · · Journal of Physics. Condensed Matter
 [1];  [2];  [3];  [4];  [5]
  1. Univ. of California, Berkeley, CA (United States); European Synchrotron Radiation Facility, Grenoble Cedex (France)
  2. Univ. of California, Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations

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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1466692
Alternate ID(s):
OSTI ID: 1238403
Journal Information:
Journal of Physics. Condensed Matter, Vol. 28, Issue 11; Related Information: © 2016 IOP Publishing Ltd.; ISSN 0953-8984
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

References (29)

Iron-Based Layered Superconductor La[O 1- x F x ]FeAs ( x = 0.05−0.12) with T c = 26 K journal March 2008
Superconductivity at 38 K in the Iron Arsenide ( Ba 1 − x K x ) Fe 2 As 2 journal September 2008
LiFeAs: An intrinsic FeAs-based superconductor with T c = 18   K journal August 2008
Transition of stoichiometric Sr 2 VO 3 FeAs to a superconducting state at 37.2 K journal June 2009
Superconductivity at 22 K in Co-Doped BaFe 2 As 2 Crystals journal September 2008
Superconducting State in SrFe 2 − x Co x As 2 by Internal Doping of the Iron Arsenide Layers journal November 2008
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
Pressure Induced Superconductivity in CaFe 2 As 2 journal July 2008
Superconductivity up to 29 K in SrFe 2 As 2 and BaFe 2 As 2 at high pressures journal December 2008
Strain induced superconductivity in the parent compound BaFe2As2 journal December 2013
First-order structural phase transition in CaFe 2 As 2 journal July 2008
Lattice and magnetic instabilities in CaFe 2 As 2 : A single-crystal neutron diffraction study journal September 2008
Magnetic and lattice coupling in single-crystal SrFe 2 As 2 : A neutron scattering study journal August 2009
Neutron scattering investigation of the magnetic order in single crystalline BaFe 2 As 2 journal May 2009
Neutron diffraction study of the magnetic and structural phase transitions in BaFe 2 As 2 journal May 2009
Heat capacity study of BaFe 2 As 2 : Effects of annealing journal October 2010
Manifestations of multiple-carrier charge transport in the magnetostructurally ordered phase of BaFe 2 As 2 journal November 2011
Character of the structural and magnetic phase transitions in the parent and electron-doped BaFe 2 As 2 compounds journal April 2011
First- and second-order magnetic and structural transitions in BaFe 2 ( 1 − x ) Co 2 x As 2 journal September 2011
Anisotropy in the Electrical Resistivity and Susceptibility of Superconducting BaFe 2 As 2 Single Crystals journal March 2009
Determination of the phase diagram of the electron-doped superconductor Ba ( Fe 1 − x Co x ) 2 As 2 journal January 2009
Influence of quenched impurities on first-order phase transitions journal April 1979
Aging effect in magnetotransport property of oxygen adsorbed BaFe2As2 conference January 2015
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
Control of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe 1 − x Co x ) 2 As 2 journal June 2012
Annealing effects on the properties of BFe 2 As 2 (B = Ca, Sr, Ba) superconducting parents journal January 2014
Powder x-ray diffraction of BaFe 2 As 2 under hydrostatic pressure journal December 2012
Appearance of pressure-induced superconductivity in BaFe 2 As 2 under hydrostatic conditions and its extremely high sensitivity to uniaxial stress journal June 2010
Effect of Uniaxial Strain on the Structural and Magnetic Phase Transitions in BaFe 2 As 2 journal February 2012

Cited By (3)

Ferroelasticity, anelasticity and magnetoelastic relaxation in Co-doped iron pnictide: Ba(Fe 0.957 Co 0.043 ) 2 As 2 journal February 2019
Ferroelasticity, anelasticity and magnetoelastic relaxation in Co-doped iron pnictide: Ba(Fe0.957Co0.043)₂As₂ text January 2019
Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity journal April 2017

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Superconductivity
Iron-pnictides
Structural phase transition