Doping evolution of spin fluctuations and their peculiar suppression at low temperatures in Ca(Fe1–xCox)2As2

Sapkota, A.; Das, P.; Bohmer, A. E.; Ueland, B. G.; Abernathy, D. L.; Bud'ko, S. L.; Canfield, P. C.; Kreyssig, A.; Goldman, A. I.; McQueeney, R. J.

doi:10.1103/PhysRevB.97.174519

Title: Doping evolution of spin fluctuations and their peculiar suppression at low temperatures in ${Ca (Fe}_{1 - x} {Co}_{x})_{2} {As}_{2}$

Abstract

Results of inelastic neutron scattering measurements are reported for two annealed compositions of Ca(Fe_1–xCo_x)₂As₂, x = 0.026 and 0.030, which possess stripe-type antiferromagnetically ordered and superconducting ground states, respectively. In the AFM ground state, well-defined and gapped spin waves are observed for x = 0.026, similar to the parent CaFe₂As₂ compound. We conclude that the well-defined spin waves are likely to be present for all x corresponding to the AFM state. This behavior is in contrast to the smooth evolution to overdamped spin dynamics observed in Ba(Fe_1–xCo_x)₂As₂, wherein the crossover corresponds to microscopically coexisting AFM order and SC at low temperature. The smooth evolution is likely absent in Ca(Fe_1–xCo_x)₂As₂ due to the mutual exclusion of AFM ordered and SC states. Overdamped spin dynamics characterize paramagnetism of the x = 0.030 sample and high-temperature x = 0.026 sample. A sizable loss of magnetic intensity is observed over a wide energy range upon cooling the x = 0.030 sample, at temperatures just above and within the superconducting phase. This phenomenon is unique amongst the iron-based superconductors and is consistent with a temperature-dependent reduction in the fluctuating moment. In conclusion, one possible scenario ascribes this loss of moment to a sensitivity to themore »« less

Authors:

Sapkota, A. ^[1]; Das, P. ^[1]; Bohmer, A. E. ^[1]; Ueland, B. G. ^[1]; Abernathy, D. L. ^[2]; Bud'ko, S. L. ^[1]; Canfield, P. C. ^[1]; Kreyssig, A. ^[1]; Goldman, A. I. ^[1]; McQueeney, R. J. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Tue May 29 00:00:00 EDT 2018

Research Org.:: Ames Lab., Ames, IA (United States)

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

OSTI Identifier:: 1439423

Alternate Identifier(s):: OSTI ID: 1439367

Report Number(s):: IS-J-9669
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1900607

Grant/Contract Number:: AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 97; Journal Issue: 17; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Sapkota, A., Das, P., Bohmer, A. E., Ueland, B. G., Abernathy, D. L., Bud'ko, S. L., Canfield, P. C., Kreyssig, A., Goldman, A. I., and McQueeney, R. J. Doping evolution of spin fluctuations and their peculiar suppression at low temperatures in Ca(Fe1–xCox)2As2.  United States: N. p., 2018. 
Web.  doi:10.1103/PhysRevB.97.174519.

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                    Sapkota, A., Das, P., Bohmer, A. E., Ueland, B. G., Abernathy, D. L., Bud'ko, S. L., Canfield, P. C., Kreyssig, A., Goldman, A. I., & McQueeney, R. J. Doping evolution of spin fluctuations and their peculiar suppression at low temperatures in Ca(Fe1–xCox)2As2.  United States.  https://doi.org/10.1103/PhysRevB.97.174519

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                    Sapkota, A., Das, P., Bohmer, A. E., Ueland, B. G., Abernathy, D. L., Bud'ko, S. L., Canfield, P. C., Kreyssig, A., Goldman, A. I., and McQueeney, R. J. Tue .  
"Doping evolution of spin fluctuations and their peculiar suppression at low temperatures in Ca(Fe1–xCox)2As2".  United States.  https://doi.org/10.1103/PhysRevB.97.174519.  https://www.osti.gov/servlets/purl/1439423.

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@article{osti_1439423,

  title        = {Doping evolution of spin fluctuations and their peculiar suppression at low temperatures in Ca(Fe1–xCox)2As2},

  author       = {Sapkota, A. and Das, P. and Bohmer, A. E. and Ueland, B. G. and Abernathy, D. L. and Bud'ko, S. L. and Canfield, P. C. and Kreyssig, A. and Goldman, A. I. and McQueeney, R. J.},

  abstractNote = {Results of inelastic neutron scattering measurements are reported for two annealed compositions of Ca(Fe1–xCox)2As2, x = 0.026 and 0.030, which possess stripe-type antiferromagnetically ordered and superconducting ground states, respectively. In the AFM ground state, well-defined and gapped spin waves are observed for x = 0.026, similar to the parent CaFe2As2 compound. We conclude that the well-defined spin waves are likely to be present for all x corresponding to the AFM state. This behavior is in contrast to the smooth evolution to overdamped spin dynamics observed in Ba(Fe1–xCox)2As2, wherein the crossover corresponds to microscopically coexisting AFM order and SC at low temperature. The smooth evolution is likely absent in Ca(Fe1–xCox)2As2 due to the mutual exclusion of AFM ordered and SC states. Overdamped spin dynamics characterize paramagnetism of the x = 0.030 sample and high-temperature x = 0.026 sample. A sizable loss of magnetic intensity is observed over a wide energy range upon cooling the x = 0.030 sample, at temperatures just above and within the superconducting phase. This phenomenon is unique amongst the iron-based superconductors and is consistent with a temperature-dependent reduction in the fluctuating moment. In conclusion, one possible scenario ascribes this loss of moment to a sensitivity to the c-axis lattice parameter in proximity to the nonmagnetic collapsed tetragonal phase and another scenario ascribes the loss to a formation of a pseudogap.},

  doi          = {10.1103/PhysRevB.97.174519},

  journal      = {Physical Review B},

  number       = 17,

  volume       = 97,

  place        = {United States},

  year         = {Tue May 29 00:00:00 EDT 2018},

  month        = {Tue May 29 00:00:00 EDT 2018}

}

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FIG. 1: (a) Phase diagram of Ca(Fe_1-xCo_$x$)₂As₂ annealed at 400°C showing the magnetostructural transition from the high-temperature tetragonal (T) and paramagnetic (PM) to the orthorhombic (O) and antiferromagnetic (AFM) phase, as well as the superconducting (SC) phase. Stars indicate the positions at which our INS measurements were performed. (b),(c) Magnetizationmore »

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https://doi.org/10.1103/PhysRevB.88.241111
Enhanced moments of Eu in single crystals of the metallic helical antiferromagnet ${EuCo}_{2 - y} {As}_{2}$

Journal Article Sangeetha, N. S. ; Anand, V. K. ; Cuervo-Reyes, Eduardo ; ... - Physical Review B

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Cited by 17
https://doi.org/10.1103/PhysRevB.97.144403

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Coexistence of antiferromagnetic and ferromagnetic spin correlations in $Ca {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ revealed by ${}^{75}{As}$ nuclear magnetic resonance

Journal Article Cui, J. ; Wiecki, P. ; Ran, S. ; ... - Physical Review B

Recent nuclear magnetic resonance (NMR) measurements revealed the coexistence of stripe-type antiferromagnetic (AFM) and ferromagnetic (FM) spin correlations in both the hole- and electron-doped BaFe ₂ As ₂ families of iron-pnictide superconductors by a Korringa ratio analysis. Motivated by the NMR work, we investigate the possible existence of FM fluctuations in another iron-pnictide superconducting family, Ca ( Fe _{1 - x}Co _x ) ₂ As ₂ . We reanalyzed our previously reported data in terms of the Korringa ratio and found clear evidence for the coexistence of stripe-type AFM and FM spin correlations in the electron-doped CaFe ₂ Asmore »« less
https://doi.org/10.1103/PhysRevB.94.174512

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Title: Doping evolution of spin fluctuations and their peculiar suppression at low temperatures in Ca ( Fe 1 – x Co x ) 2 As 2

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Spin-State Transition in the Fe Pnictides journal, January 2013

Itinerant Magnetic Excitations in Antiferromagnetic CaFe 2 As 2 journal, May 2009

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

Spin waves and magnetic exchange interactions in CaFe2As2 journal, July 2009

Structural Origin of the Anomalous Temperature Dependence of the Local Magnetic Moments in the CaFe 2 As 2 Family of Materials journal, January 2015

Phase transition and superconductivity of SrFe 2 As 2 under high pressure journal, March 2011

Coexistence of Competing Antiferromagnetic and Superconducting Phases in the Underdoped Ba ( Fe 0.953 Co 0.047 ) 2 As 2 Compound Using X-ray and Neutron Scattering Techniques journal, August 2009

Complete pressure-dependent phase diagrams for SrFe 2 As 2 and BaFe 2 As 2 journal, June 2009

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

Antiferromagnetic order in the ThCr2Si2 type phosphides CaCo2P2 and CeCo2P2 journal, February 1998

Two-dimensional resonant magnetic excitation in BaFe 1.84 Co 0.16 As 2 journal, March 2009

Superconducting properties and pseudogap from preformed Cooper pairs in the triclinic ( CaFe 1 − x Pt x As ) 10 Pt 3 As 8 journal, March 2015

Thermal expansion of CaFe 2 As 2 : Effect of cobalt doping and postgrowth thermal treatment journal, August 2013

Structural transition and anisotropic properties of single-crystalline SrFe 2 As 2 journal, July 2008

Combined effects of transition metal (Ni and Rh) substitution and annealing/quenching on the physical properties of CaFe 2 As 2 journal, August 2014

Cu 63 NMR shift and linewidth anomalies in the T c =60 K phase of Y-Ba-Cu-O journal, May 1990

Making and Breaking Bonds in the Solid State: The ThCr 2 Si 2 Structure journal, September 1985

Antiferromagnetic spin correlations and pseudogaplike behavior in Ca ( Fe 1 − x Co x ) 2 As 2 studied by As 75 nuclear magnetic resonance and anisotropic resistivity journal, November 2015

Superconductivity in iron compounds journal, December 2011

Inelastic Neutron Scattering Study of a Nonmagnetic Collapsed Tetragonal Phase in Nonsuperconducting CaFe 2 As 2 : Evidence of the Impact of Spin Fluctuations on Superconductivity in the Iron-Arsenide Compounds journal, November 2013

High-energy spin excitations in BaFe 2 As 2 observed by inelastic neutron scattering journal, December 2008

Anisotropic itinerant magnetism and spin fluctuations in BaFe 2 As 2 : A neutron scattering study journal, February 2009

Anomalous Suppression of the Orthorhombic Lattice Distortion in Superconducting Ba ( Fe 1 − x Co x ) 2 As 2 Single Crystals journal, February 2010

Crossover from spin waves to diffusive spin excitations in underdoped Ba ( Fe 1 − x Co x ) 2 As 2 journal, May 2014

Pressure-induced collapsed-tetragonal phase in SrCo 2 As 2 journal, December 2015

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

Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped BaMn 2 As 2 journal, June 2017

Normal-state spin dynamics and temperature-dependent spin-resonance energy in optimally doped BaFe1.85Co0.15As2 journal, December 2009

The new cold neutron chopper spectrometer at the Spallation Neutron Source: Design and performance journal, August 2011

Horace : Software for the analysis of data from single crystal spectroscopy experiments at time-of-flight neutron instruments journal, October 2016

Antiferromagnetic order and spin dynamics in iron-based superconductors journal, August 2015

First-order structural phase transition in CaFe 2 As 2 journal, July 2008

Suppression of magnetic order in CaCo 1.86 As 2 with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of Ca ( Co 1 − x Fe x ) y As 2 journal, February 2017

Doping dependence of spin dynamics in electron-doped Ba ( Fe 1 − x Co x ) 2 As 2 journal, August 2010

Pseudogap from ARPES experiment: Three gaps in cuprates and topological superconductivity (Review Article) journal, May 2015

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

Strong Coupling of the Fe-Spin State and the As-As Hybridization in Iron-Pnictide Superconductors from First-Principle Calculations journal, January 2009

Pressure Induced Superconductivity in CaFe 2 As 2 journal, July 2008

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

Collapsed tetragonal phase and superconductivity of BaFe 2 As 2 under high pressure journal, October 2010

The pseudogap: friend or foe of high T c ? journal, December 2005

Magnetism in Fe-based superconductors journal, April 2010

Pressure-induced volume-collapsed tetragonal phase of CaFe 2 As 2 as seen via neutron scattering journal, November 2008

Structure and magnetic properties of the phosphides CaCo2P2 and LnT2P2 with ThCr2Si2 structure and LnTP with PbFCl structure (Ln = Lanthanoids, T = Fe, Co, Ni)† journal, January 1990

Measurement of Anomalous Phonon Dispersion of CaFe 2 As 2 Single Crystals Using Inelastic Neutron Scattering journal, May 2009

Magnetic excitations in underdoped Ba(Fe 1 − x Co x ) 2 As 2 with x = 0.047 journal, July 2012

The pseudogap in high-temperature superconductors: an experimental survey journal, January 1999

Evolution of the resonance and incommensurate spin fluctuations in superconducting YBa 2 Cu 3 O 6 + x journal, January 2001

Design and operation of the wide angular-range chopper spectrometer ARCS at the Spallation Neutron Source journal, January 2012

FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe 2 As 2 journal, August 2010

Cu spin dynamics and superconducting precursor effects in planes above T c in YBa 2 Cu 3 O 6.7 journal, March 1989

Absence of superconductivity in single-phase CaFe 2 As 2 under hydrostatic pressure journal, January 2009

Paramagnetic spin correlations in CaFe 2 As 2 single crystals journal, June 2010

Crystal growth and physical properties of SrCu 2 As 2 , SrCu 2 Sb 2 , and BaCu 2 Sb 2 journal, June 2012

Unconventional pairing in the iron arsenide superconductors journal, April 2010

Control of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe 1 − x Co x ) 2 As 2 journal, June 2012

Competing order and nature of the pairing state in the iron pnictides journal, July 2010

Physical properties of metallic antiferromagnetic CaCo 1.86 As 2 single crystals journal, June 2014

Dynamic stripes and resonance in the superconducting and normal phases of YBa 2 Cu 3 O 6.5 ortho-II superconductor journal, January 2004

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides journal, October 2010

Title: Doping evolution of spin fluctuations and their peculiar suppression at low temperatures in ${Ca (Fe}_{1 - x} {Co}_{x})_{2} {As}_{2}$

Spin-State Transition in the Fe Pnictides
journal, January 2013

Itinerant Magnetic Excitations in Antiferromagnetic ${CaFe}_{2} {As}_{2}$
journal, May 2009

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

Spin waves and magnetic exchange interactions in CaFe2As2
journal, July 2009

Structural Origin of the Anomalous Temperature Dependence of the Local Magnetic Moments in the ${CaFe}_{2} {As}_{2}$ Family of Materials
journal, January 2015

Phase transition and superconductivity of SrFe ₂ As ₂ under high pressure
journal, March 2011

Coexistence of Competing Antiferromagnetic and Superconducting Phases in the Underdoped $Ba ({Fe}_{0.953} {Co}_{0.047})_{2} {As}_{2}$ Compound Using X-ray and Neutron Scattering Techniques
journal, August 2009

Complete pressure-dependent phase diagrams for ${SrFe}_{2} {As}_{2}$ and ${BaFe}_{2} {As}_{2}$
journal, June 2009

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

Antiferromagnetic order in the ThCr2Si2 type phosphides CaCo2P2 and CeCo2P2
journal, February 1998

Two-dimensional resonant magnetic excitation in ${BaFe}_{1.84} {Co}_{0.16} {As}_{2}$
journal, March 2009

Superconducting properties and pseudogap from preformed Cooper pairs in the triclinic ${({CaFe}_{1 - x} {Pt}_{x} As)}_{10} {Pt}_{3} {As}_{8}$
journal, March 2015

Thermal expansion of CaFe $_{2}$ As $_{2}$ : Effect of cobalt doping and postgrowth thermal treatment
journal, August 2013

Structural transition and anisotropic properties of single-crystalline ${SrFe}_{2} {As}_{2}$
journal, July 2008

Combined effects of transition metal (Ni and Rh) substitution and annealing/quenching on the physical properties of ${CaFe}_{2} {As}_{2}$
journal, August 2014

${}^{63}{Cu}$ NMR shift and linewidth anomalies in the $T_{c}$ =60 K phase of Y-Ba-Cu-O
journal, May 1990

Making and Breaking Bonds in the Solid State: The ThCr ₂ Si ₂ Structure
journal, September 1985

Antiferromagnetic spin correlations and pseudogaplike behavior in $Ca {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ studied by ${}^{75}{As}$ nuclear magnetic resonance and anisotropic resistivity
journal, November 2015

Superconductivity in iron compounds
journal, December 2011

Inelastic Neutron Scattering Study of a Nonmagnetic Collapsed Tetragonal Phase in Nonsuperconducting ${CaFe}_{2} {As}_{2}$ : Evidence of the Impact of Spin Fluctuations on Superconductivity in the Iron-Arsenide Compounds
journal, November 2013

High-energy spin excitations in ${BaFe}_{2} {As}_{2}$ observed by inelastic neutron scattering
journal, December 2008

Anisotropic itinerant magnetism and spin fluctuations in ${BaFe}_{2} {As}_{2}$ : A neutron scattering study
journal, February 2009

Anomalous Suppression of the Orthorhombic Lattice Distortion in Superconducting $Ba ({Fe}_{1 - x} {Co}_{x})_{2} {As}_{2}$ Single Crystals
journal, February 2010

Crossover from spin waves to diffusive spin excitations in underdoped $Ba ({Fe}_{1 - x} {Co}_{x})_{2} {As}_{2}$
journal, May 2014

Pressure-induced collapsed-tetragonal phase in ${SrCo}_{2} {As}_{2}$
journal, December 2015

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

Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped ${BaMn}_{2} {As}_{2}$
journal, June 2017

Normal-state spin dynamics and temperature-dependent spin-resonance energy in optimally doped BaFe1.85Co0.15As2
journal, December 2009

The new cold neutron chopper spectrometer at the Spallation Neutron Source: Design and performance
journal, August 2011

Horace : Software for the analysis of data from single crystal spectroscopy experiments at time-of-flight neutron instruments
journal, October 2016

Antiferromagnetic order and spin dynamics in iron-based superconductors
journal, August 2015

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

Suppression of magnetic order in ${CaCo}_{1.86} {As}_{2}$ with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of $Ca {({Co}_{1 - x} {Fe}_{x})}_{y} {As}_{2}$
journal, February 2017

Doping dependence of spin dynamics in electron-doped $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$
journal, August 2010

Pseudogap from ARPES experiment: Three gaps in cuprates and topological superconductivity (Review Article)
journal, May 2015

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

Strong Coupling of the Fe-Spin State and the As-As Hybridization in Iron-Pnictide Superconductors from First-Principle Calculations
journal, January 2009

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

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

Collapsed tetragonal phase and superconductivity of ${BaFe}_{2} {As}_{2}$ under high pressure
journal, October 2010

The pseudogap: friend or foe of high T _c ?
journal, December 2005

Magnetism in Fe-based superconductors
journal, April 2010

Pressure-induced volume-collapsed tetragonal phase of ${CaFe}_{2} {As}_{2}$ as seen via neutron scattering
journal, November 2008

Structure and magnetic properties of the phosphides CaCo2P2 and LnT2P2 with ThCr2Si2 structure and LnTP with PbFCl structure (Ln = Lanthanoids, T = Fe, Co, Ni)†
journal, January 1990

Measurement of Anomalous Phonon Dispersion of ${CaFe}_{2} {As}_{2}$ Single Crystals Using Inelastic Neutron Scattering
journal, May 2009

Magnetic excitations in underdoped Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ with $x = 0.047$
journal, July 2012

The pseudogap in high-temperature superconductors: an experimental survey
journal, January 1999

Evolution of the resonance and incommensurate spin fluctuations in superconducting ${YBa}_{2} {Cu}_{3} O_{6 + x}$
journal, January 2001

Design and operation of the wide angular-range chopper spectrometer ARCS at the Spallation Neutron Source
journal, January 2012

FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe ₂ As ₂
journal, August 2010

Cu spin dynamics and superconducting precursor effects in planes above $T_{c}$ in ${YBa}_{2}$ ${Cu}_{3}$ $O_{6.7}$
journal, March 1989

Absence of superconductivity in single-phase ${CaFe}_{2} {As}_{2}$ under hydrostatic pressure
journal, January 2009

Paramagnetic spin correlations in ${CaFe}_{2} {As}_{2}$ single crystals
journal, June 2010

Crystal growth and physical properties of SrCu $_{2}$ As $_{2}$ , SrCu $_{2}$ Sb $_{2}$ , and BaCu $_{2}$ Sb $_{2}$
journal, June 2012

Unconventional pairing in the iron arsenide superconductors
journal, April 2010

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

Competing order and nature of the pairing state in the iron pnictides
journal, July 2010

Physical properties of metallic antiferromagnetic ${CaCo}_{1.86}$ ${As}_{2}$ single crystals
journal, June 2014

Dynamic stripes and resonance in the superconducting and normal phases of ${YBa}_{2} {Cu}_{3} O_{6.5}$ ortho-II superconductor
journal, January 2004

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
journal, October 2010