Neutron scattering study of underdoped Ba1-xKxFe₂As₂ (x=0.09 and 0.17) self-flux-grown single crystals and the universality of the tricritical point

Rotundu, C. R.; Tian, W.; Rule, K. C.; Forrest, T. R.; Zhao, J.; Zarestky, J. L.; Birgeneau, R. J.

doi:10.1103/PhysRevB.85.144506

Title: Neutron scattering study of underdoped Ba_1-xK_xFe₂As₂ (x=0.09 and 0.17) self-flux-grown single crystals and the universality of the tricritical point

Abstract

We present a combination of elastic neutron scattering measurements in zero and 14.5 T and magnetization measurements in zero and 14 T on underdoped superconducting Ba_1-xK_xFe₂As₂ (x=0.17), and the same measurements in zero field on a nonsuperconducting crystal with x=0.09. The data suggest that the underdoped materials may not be electronic phase separated but rather have slightly inhomogeneous potassium doping. The temperature dependence of the magnetic order parameter below the transition of the sample with x=0.09 is more gradual than that for the case of the undoped BaFe₂As₂, suggesting that this doping may be in the vicinity of a tricritical point. We advance therefore the hypothesis that the tricritical point is a common feature of all superconducting 122_s. For the x=0.17 sample, while T_c is suppressed from ≈17 to ≈8 K by a magnetic field of 14 T, the intensity of the magnetic Bragg peaks (1 0 3) at 1.2 K is enhanced by 10%, showing competition of superconductivity and antiferromagnetism. The intensity of the magnetic Bragg peaks (1 0 3) in the (T_c, T_N) temperature interval remain practically unchanged in 14.5 T within a 10% statistical error. The present results are discussed in the context of the existing literature.

Authors:: Rotundu, C. R.; Tian, W.; Rule, K. C.; Forrest, T. R.; Zhao, J.; Zarestky, J. L.; Birgeneau, R. J.

Publication Date:: Wed Apr 04 00:00:00 EDT 2012

Sponsoring Org.:: USDOE

OSTI Identifier:: 1098666

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 85 Journal Issue: 14; Journal ID: ISSN 1098-0121

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Citation Formats


                    Rotundu, C. R., Tian, W., Rule, K. C., Forrest, T. R., Zhao, J., Zarestky, J. L., and Birgeneau, R. J. Neutron scattering study of underdoped Ba1-xKxFe₂As₂ (x=0.09 and 0.17) self-flux-grown single crystals and the universality of the tricritical point.  United States: N. p., 2012. 
Web.  doi:10.1103/PhysRevB.85.144506.

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                    Rotundu, C. R., Tian, W., Rule, K. C., Forrest, T. R., Zhao, J., Zarestky, J. L., & Birgeneau, R. J. Neutron scattering study of underdoped Ba1-xKxFe₂As₂ (x=0.09 and 0.17) self-flux-grown single crystals and the universality of the tricritical point.  United States.  https://doi.org/10.1103/PhysRevB.85.144506

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                    Rotundu, C. R., Tian, W., Rule, K. C., Forrest, T. R., Zhao, J., Zarestky, J. L., and Birgeneau, R. J. Wed .  
"Neutron scattering study of underdoped Ba1-xKxFe₂As₂ (x=0.09 and 0.17) self-flux-grown single crystals and the universality of the tricritical point".  United States.  https://doi.org/10.1103/PhysRevB.85.144506.

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@article{osti_1098666,

  title        = {Neutron scattering study of underdoped Ba1-xKxFe₂As₂ (x=0.09 and 0.17) self-flux-grown single crystals and the universality of the tricritical point},

  author       = {Rotundu, C. R. and Tian, W. and Rule, K. C. and Forrest, T. R. and Zhao, J. and Zarestky, J. L. and Birgeneau, R. J.},

  abstractNote = {We present a combination of elastic neutron scattering measurements in zero and 14.5 T and magnetization measurements in zero and 14 T on underdoped superconducting Ba1-xKxFe₂As₂ (x=0.17), and the same measurements in zero field on a nonsuperconducting crystal with x=0.09. The data suggest that the underdoped materials may not be electronic phase separated but rather have slightly inhomogeneous potassium doping. The temperature dependence of the magnetic order parameter below the transition of the sample with x=0.09 is more gradual than that for the case of the undoped BaFe₂As₂, suggesting that this doping may be in the vicinity of a tricritical point. We advance therefore the hypothesis that the tricritical point is a common feature of all superconducting 122s. For the x=0.17 sample, while Tc is suppressed from ≈17 to ≈8 K by a magnetic field of 14 T, the intensity of the magnetic Bragg peaks (1 0 3) at 1.2 K is enhanced by 10%, showing competition of superconductivity and antiferromagnetism. The intensity of the magnetic Bragg peaks (1 0 3) in the (Tc, TN) temperature interval remain practically unchanged in 14.5 T within a 10% statistical error. The present results are discussed in the context of the existing literature.},

  doi          = {10.1103/PhysRevB.85.144506},

  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  number       = 14,

  volume       = 85,

  place        = {United States},

  year         = {Wed Apr 04 00:00:00 EDT 2012},

  month        = {Wed Apr 04 00:00:00 EDT 2012}

}

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Decoupling of the superconducting and magnetic/structural phase transitions in electron-doped BaFe 2 As 2 journal, August 2009

Transport properties and asymmetric scattering in Ba 1 − x K x Fe 2 As 2 single crystals journal, November 2011

Superconductivity at 55 K in Iron-Based F-Doped Layered Quaternary Compound Sm[O 1- x F x ] FeAs journal, May 2008

Superconductivity, magnetism and crystal chemistry of Ba1−xKxFe2As2 journal, May 2009

Growth and characterization of A 1− x K x Fe 2 As 2 (A = Ba, Sr) single crystals with x = 0–0.4 journal, October 2008

Phase diagram of the iron arsenide superconductors Ca(Fe 1 − x Co x ) 2 As 2 ( 0 ⩽ x ⩽ 0 . 2 ) journal, March 2011

Neutron spin resonance as a probe of the superconducting energy gap of BaFe 1.9 Ni 0.1 As 2 superconductors journal, May 2010

Antiferromagnetic order induced by an applied magnetic field in a high-temperature superconductor journal, January 2002

Heat capacity of Ba 1- x K x Fe 2 As 2 , x=0 and 0.41 journal, January 2011

Proximity of iron pnictide superconductors to a quantum tricritical point journal, July 2011

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

Electronic Phase Separation in the Slightly Underdoped Iron Pnictide Superconductor Ba 1 − x K x Fe 2 As 2 journal, March 2009

Coexistence of the spin-density wave and superconductivity in Ba 1−x K x Fe 2 As 2 journal, January 2009

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

Effective carrier type and field dependence of the reduced- T c superconducting state in SrFe 2 − x Ni x As 2 journal, January 2010

Microstructure and superconductivity of Ir-doped BaFe2As2 superconductor journal, January 2010

Determination of anisotropic H c 2 up to 60 T in Ba 0.55 K 0.45 Fe 2 As 2 single crystals journal, December 2008

Antiferromagnetic order as the competing ground state in electron-doped Nd1.85Ce0.15CuO4 journal, May 2003

Antiferromagnetic ordering and structural phase transition in Ba 2 Fe 2 As 2 with Sn incorporated from the growth flux journal, February 2009

Superconducting State in SrFe 2 − x Co x As 2 by Internal Doping of the Iron Arsenide Layers journal, November 2008

Annealing effects on superconductivity in SrFe 2 - x Ni x As 2 journal, December 2010

Physical and magnetic properties of Ba ( Fe 1 − x Ru x ) 2 As 2 single crystals journal, July 2010

Superconductivity Induced by Phosphorus Doping and Its Coexistence with Ferromagnetism in EuFe 2 ( As 0.7 P 0.3 ) 2 journal, April 2009

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

Magnetic ordering and structural distortion in Ru-doped BaFe 2 As 2 single crystals studied by neutron and x-ray diffraction journal, February 2011

Specific heat anomalies for T\ll T_{\mathrm {c}} in superconducting single crystal doped BaFe 2 As 2 : comparison of different flux growth methods journal, June 2009

Superconductivity and phase diagram in iron-based arsenic-oxides ReFeAsO 1−δ (Re = rare-earth metal) without fluorine doping journal, June 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

Superconductivity at 38 K in the Iron Arsenide ( Ba 1 − x K x ) Fe 2 As 2 journal, September 2008

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

Commonalities in phase and mode journal, April 2009

Phase diagrams of Ba ( Fe 1 − x M x ) 2 As 2 single crystals ( M = Rh and Pd) journal, July 2009

Unconventional pairing in the iron arsenide superconductors journal, April 2010

Heat capacity study of BaFe 2 As 2 : Effects of annealing journal, October 2010

Microscopic Coexistence of Superconductivity and Magnetism in Ba 1 − x K x Fe 2 As 2 journal, November 2011

Enhancement of long-range magnetic order by magnetic field in superconducting La 2 CuO 4 + y journal, July 2002

Superconductivity at 26 K in (Ca 1- x Na x )Fe 2 As 2 journal, August 2008

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

Distinct High- T Transitions in Underdoped Ba 1 − x K x Fe 2 As 2 journal, August 2010

Magnetoelastic coupling in the phase diagram of Ba 1 − x K x Fe 2 As 2 as seen via neutron diffraction journal, May 2011

Superconductivity induced by Ni doping in BaFe 2 As 2 single crystals journal, February 2009

Title: Neutron scattering study of underdoped Ba_1-xK_xFe₂As₂ (x=0.09 and 0.17) self-flux-grown single crystals and the universality of the tricritical point

Unity or diversity?
journal, December 2008

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

Magnetic field effect on static antiferromagnetic order and spin excitations in the underdoped iron arsenide superconductor BaFe $_{1.92}$ Ni $_{0.08}$ As $_{2}$
journal, March 2011

Neutron-Diffraction Measurements of Magnetic Order and a Structural Transition in the Parent ${BaFe}_{2} {As}_{2}$ Compound of FeAs-Based High-Temperature Superconductors
journal, December 2008

Spin-density-wave anomaly at 140 K in the ternary iron arsenide ${BaFe}_{2} {As}_{2}$
journal, July 2008

Substitution-induced superconductivity in ${SrFe}_{2 - x} {Ru}_{x} {As}_{2}$ $(0 \leq x \leq 2)$
journal, June 2009

Direct Observation of Local Potassium Variation and Its Correlation to Electronic Inhomogeneity in $({Ba}_{1 - x} K_{x}) {Fe}_{2} {As}_{2}$ Pnictide
journal, June 2011

Evolution from non-Fermi- to Fermi-liquid transport via isovalent doping in ${BaFe}_{2} {({As}_{1 - x} P_{x})}_{2}$ superconductors
journal, May 2010

Evolution of bulk superconductivity in ${SrFe}_{2} {As}_{2}$ with Ni substitution
journal, June 2009

Decoupling of the superconducting and magnetic/structural phase transitions in electron-doped ${BaFe}_{2} {As}_{2}$
journal, August 2009

Transport properties and asymmetric scattering in Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ single crystals
journal, November 2011

Superconductivity at 55 K in Iron-Based F-Doped Layered Quaternary Compound Sm[O _{1- x} F _x ] FeAs
journal, May 2008

Superconductivity, magnetism and crystal chemistry of Ba1−xKxFe2As2
journal, May 2009

Growth and characterization of A _{1− x} K _x Fe ₂ As ₂ (A = Ba, Sr) single crystals with x = 0–0.4
journal, October 2008

Phase diagram of the iron arsenide superconductors Ca(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ ( $0 ⩽ x ⩽ 0.2$ )
journal, March 2011

Neutron spin resonance as a probe of the superconducting energy gap of ${BaFe}_{1.9} {Ni}_{0.1} {As}_{2}$ superconductors
journal, May 2010

Antiferromagnetic order induced by an applied magnetic field in a high-temperature superconductor
journal, January 2002

Heat capacity of Ba _{1- x} K _x Fe ₂ As ₂ , x=0 and 0.41
journal, January 2011

Proximity of iron pnictide superconductors to a quantum tricritical point
journal, July 2011

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

Electronic Phase Separation in the Slightly Underdoped Iron Pnictide Superconductor ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$
journal, March 2009

Coexistence of the spin-density wave and superconductivity in Ba _1−x K _x Fe ₂ As ₂
journal, January 2009

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

Effective carrier type and field dependence of the reduced- $T_{c}$ superconducting state in ${SrFe}_{2 - x} {Ni}_{x} {As}_{2}$
journal, January 2010

Microstructure and superconductivity of Ir-doped BaFe2As2 superconductor
journal, January 2010

Determination of anisotropic $H_{c 2}$ up to 60 T in ${Ba}_{0.55} K_{0.45} {Fe}_{2} {As}_{2}$ single crystals
journal, December 2008

Antiferromagnetic order as the competing ground state in electron-doped Nd1.85Ce0.15CuO4
journal, May 2003

Antiferromagnetic ordering and structural phase transition in ${Ba}_{2} {Fe}_{2} {As}_{2}$ with Sn incorporated from the growth flux
journal, February 2009

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

Annealing effects on superconductivity in ${SrFe}_{2 - x} {Ni}_{x} {As}_{2}$
journal, December 2010

Physical and magnetic properties of $Ba {({Fe}_{1 - x} {Ru}_{x})}_{2} {As}_{2}$ single crystals
journal, July 2010

Superconductivity Induced by Phosphorus Doping and Its Coexistence with Ferromagnetism in ${EuFe}_{2} ({As}_{0.7} P_{0.3})_{2}$
journal, April 2009

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

Magnetic ordering and structural distortion in Ru-doped BaFe $_{2}$ As $_{2}$ single crystals studied by neutron and x-ray diffraction
journal, February 2011

Specific heat anomalies for T\ll T_{\mathrm {c}} in superconducting single crystal doped BaFe ₂ As ₂ : comparison of different flux growth methods
journal, June 2009

Superconductivity and phase diagram in iron-based arsenic-oxides ReFeAsO _1−δ (Re = rare-earth metal) without fluorine doping
journal, June 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

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

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

Commonalities in phase and mode
journal, April 2009

Phase diagrams of $Ba {({Fe}_{1 - x} M_{x})}_{2} {As}_{2}$ single crystals ( $M = Rh$ and Pd)
journal, July 2009

Unconventional pairing in the iron arsenide superconductors
journal, April 2010

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

Microscopic Coexistence of Superconductivity and Magnetism in ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$
journal, November 2011

Enhancement of long-range magnetic order by magnetic field in superconducting ${La}_{2} {CuO}_{4 + y}$
journal, July 2002

Superconductivity at 26 K in (Ca _{1- x} Na _x )Fe ₂ As ₂
journal, August 2008

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

Distinct High- $T$ Transitions in Underdoped ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$
journal, August 2010

Magnetoelastic coupling in the phase diagram of Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ as seen via neutron diffraction
journal, May 2011

Superconductivity induced by Ni doping in BaFe ₂ As ₂ single crystals
journal, February 2009