Toward the Mott state with magnetic cluster formation in heavily Cu-doped NaFe1-xCuxAs

Xin, Yizhou; Stolt, Ingrid; Lee, Jeongseop A.; Song, Yu; Dai, Pengcheng; Halperin, W. P.

doi:10.1103/PhysRevB.99.155114

Title: Toward the Mott state with magnetic cluster formation in heavily Cu-doped ${NaFe}_{1 - x} {Cu}_{x} As$

Abstract

Recent neutron scattering measurements imply that NaFe$$_{1-x}$$Cu$$_{x}$$As forms an antiferromagnetic stripe phase near $$x\approx 0.5$$ in a Mott insulating state. This copper concentration is well in excess of that required for superconductivity, $x < 0.04$. We have investigated the development of magnetism in this compound using $$^{23}$$Na nuclear magnetic resonance (NMR) spectra and spin-lattice relaxation measurements performed on single crystals ($$x$$ = 0.13, 0.18, 0.24, and 0.39). We find multiple inequivalent Na sites, each of which is associated with a different number of nearest neighbor Fe sites occupied by a Cu dopant. We show that the distribution of Cu substituted for Fe is random in-plane for low concentrations ($x = 0.13$ and 0.18), but deviates from this with increasing Cu doping. As is characteristic of many pnictide compounds, there is a spin pseudo gap that increases in magnitude with dopant concentration. This is correlated with a corresponding increase in orbital NMR frequency shift indicating a change in valence from Cu$$^{2+}$$ to a Cu$$^{1+}$$ state as $$x$$ exceeds 0.18, concomitant with the change of Fe$$^{2+}$$ to Fe$$^{3+}$$ resulting in the formation of magnetic clusters. Yet, for $$x\leq 0.39$$ there is no evidence of long-range static magnetic order.

Authors:

Xin, Yizhou ^[1]; Stolt, Ingrid ^[1]; Lee, Jeongseop A. ^[1]; Song, Yu ^[2]; Dai, Pengcheng ^[3]; Halperin, W. P. ^[1]

Northwestern Univ., Evanston, IL (United States)
Rice Univ., Houston, TX (United States); Univ. of California, Berkeley, CA (United States)
Rice Univ., Houston, TX (United States)

Publication Date:: Mon Apr 08 00:00:00 EDT 2019

Research Org.:: Northwestern Univ., Evanston, IL (United States)

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

OSTI Identifier:: 1506097

Alternate Identifier(s):: OSTI ID: 1505669

Grant/Contract Number:: FG02-05ER46248; FG02-05ER46202; SC0012311

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 99; Journal Issue: 15; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Antiferromagnetism; Stripes; Mott Insulators; Pnictides; Strongly correlated systems; Nuclear magnetic resonance

Citation Formats


                    Xin, Yizhou, Stolt, Ingrid, Lee, Jeongseop A., Song, Yu, Dai, Pengcheng, and Halperin, W. P. Toward the Mott state with magnetic cluster formation in heavily Cu-doped NaFe1-xCuxAs.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevB.99.155114.

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                    Xin, Yizhou, Stolt, Ingrid, Lee, Jeongseop A., Song, Yu, Dai, Pengcheng, & Halperin, W. P. Toward the Mott state with magnetic cluster formation in heavily Cu-doped NaFe1-xCuxAs.  United States.  https://doi.org/10.1103/PhysRevB.99.155114

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                    Xin, Yizhou, Stolt, Ingrid, Lee, Jeongseop A., Song, Yu, Dai, Pengcheng, and Halperin, W. P. Mon .  
"Toward the Mott state with magnetic cluster formation in heavily Cu-doped NaFe1-xCuxAs".  United States.  https://doi.org/10.1103/PhysRevB.99.155114.  https://www.osti.gov/servlets/purl/1506097.

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@article{osti_1506097,

  title        = {Toward the Mott state with magnetic cluster formation in heavily Cu-doped NaFe1-xCuxAs},

  author       = {Xin, Yizhou and Stolt, Ingrid and Lee, Jeongseop A. and Song, Yu and Dai, Pengcheng and Halperin, W. P.},

  abstractNote = {Recent neutron scattering measurements imply that NaFe$_{1-x}$Cu$_{x}$As forms an antiferromagnetic stripe phase near $x\approx 0.5$ in a Mott insulating state. This copper concentration is well in excess of that required for superconductivity, $x < 0.04$. We have investigated the development of magnetism in this compound using $^{23}$Na nuclear magnetic resonance (NMR) spectra and spin-lattice relaxation measurements performed on single crystals ($x$ = 0.13, 0.18, 0.24, and 0.39). We find multiple inequivalent Na sites, each of which is associated with a different number of nearest neighbor Fe sites occupied by a Cu dopant. We show that the distribution of Cu substituted for Fe is random in-plane for low concentrations ($x = 0.13$ and 0.18), but deviates from this with increasing Cu doping. As is characteristic of many pnictide compounds, there is a spin pseudo gap that increases in magnitude with dopant concentration. This is correlated with a corresponding increase in orbital NMR frequency shift indicating a change in valence from Cu$^{2+}$ to a Cu$^{1+}$ state as $x$ exceeds 0.18, concomitant with the change of Fe$^{2+}$ to Fe$^{3+}$ resulting in the formation of magnetic clusters. Yet, for $x\leq 0.39$ there is no evidence of long-range static magnetic order.},

  doi          = {10.1103/PhysRevB.99.155114},

  journal      = {Physical Review B},

  number       = 15,

  volume       = 99,

  place        = {United States},

  year         = {Mon Apr 08 00:00:00 EDT 2019},

  month        = {Mon Apr 08 00:00:00 EDT 2019}

}

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Title: Toward the Mott state with magnetic cluster formation in heavily Cu-doped NaFe 1 - x Cu x As

Abstract

Citation Formats

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

Spin pairing and penetration depth measurements from nuclear magnetic resonance in NaFe 0.975 Co 0.025 As journal, May 2013

Coexistence of antiferromagnetic and ferromagnetic spin correlations in Ca ( Fe 1 − x Co x ) 2 As 2 revealed by As 75 nuclear magnetic resonance journal, November 2016

F 19 NMR investigation of the iron pnictide superconductor LaFeAsO 0.89 F 0.11 journal, September 2008

59 Co and 75 As NMR Investigation of Electron-Doped High T c Superconductor BaFe 1.8 Co 0.2 As 2 ( T c = 22 K) journal, October 2008

Phase diagram and physical properties of NaFe 1 − x Cu x As single crystals journal, September 2013

Narrow superconducting window in LaFe 1 − x Ni x AsO journal, May 2009

Strong Similarities between the Local Electronic Structure of Insulating Iron Pnictide and Lightly Doped Cuprate journal, April 2015

Crossover from Commensurate to Incommensurate Antiferromagnetism in Stoichiometric NaFeAs Revealed by Single-Crystal 23 Na, 75 As-NMR Experiments journal, March 2011

Table of nuclear magnetic dipole and electric quadrupole moments journal, May 2005

Contrasting Spin Dynamics between Underdoped and Overdoped Ba ( Fe 1 − x Co x ) 2 As 2 journal, January 2010

NaFe 0.56 Cu 0.44 As : A Pnictide Insulating Phase Induced by On-Site Coulomb Interaction journal, August 2016

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As 75 NMR of Ba(Fe 0.93 Co 0.07 ) 2 As 2 in high magnetic field journal, June 2011

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A Mott insulator continuously connected to iron pnictide superconductors journal, December 2016

Transport properties and electronic phase diagram of single-crystalline Ca 10 ( Pt 3 As 8 ) ( ( Fe 1 − x Pt x ) 2 As 2 ) 5 journal, June 2012

Orbital-dependent effects of electron correlations in microscopic models for iron-based superconductors journal, April 2013

The Effect of Electron-Electron Interaction on the Nuclear Spin Relaxation in Metals journal, April 1963

Microscopic coexistence of a two-component incommensurate spin density wave with superconductivity in underdoped NaFe 0.983 Co 0.017 As journal, October 2013

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

Phase diagram and calorimetric properties of NaFe 1 − x Co x As journal, June 2012

59-Co and 75-As NMR Investigation of Electron-Doped High Tc Superconductor BaFe(1.8)Co(0.2)As(2) (Tc = 22K) text, January 2008

Crossover from commensurate to incommensurate antiferromagnetism in stoichiometric NaFeAs revealed by single-crystal 23Na,75As-NMR experiments text, January 2010

Superconductivity in Iron Compounds text, January 2011

Spin-pairing and penetration depth measurements from nuclear magnetic resonance in NaFe$_{0.975}$Co$_{0.025}$As text, January 2013

Orbital-dependent effects of electron correlations in microscopic models for iron-based superconductors text, January 2013

Antiferromagnetic order and spin dynamics in iron-based superconductors text, January 2015

Strong similarities between the local electronic structure of insulating iron pnictide and lightly doped cuprate text, January 2015

Title: Toward the Mott state with magnetic cluster formation in heavily Cu-doped ${NaFe}_{1 - x} {Cu}_{x} As$

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

Spin pairing and penetration depth measurements from nuclear magnetic resonance in NaFe $_{0.975}$ Co $_{0.025}$ As
journal, May 2013

Coexistence of antiferromagnetic and ferromagnetic spin correlations in $Ca {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ revealed by ${}^{75}{As}$ nuclear magnetic resonance
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${}^{19}F$ NMR investigation of the iron pnictide superconductor ${LaFeAsO}_{0.89} F_{0.11}$
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⁵⁹ Co and ⁷⁵ As NMR Investigation of Electron-Doped High T _c Superconductor BaFe _1.8 Co _0.2 As ₂ ( T _c = 22 K)
journal, October 2008

Phase diagram and physical properties of NaFe $_{1 - x}$ Cu $_{x}$ As single crystals
journal, September 2013

Narrow superconducting window in ${LaFe}_{1 - x} {Ni}_{x} AsO$
journal, May 2009

Strong Similarities between the Local Electronic Structure of Insulating Iron Pnictide and Lightly Doped Cuprate
journal, April 2015

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journal, March 2011

Table of nuclear magnetic dipole and electric quadrupole moments
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journal, August 2016

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journal, October 2017

${}^{75}{As}$ NMR of Ba(Fe $_{0.93}$ Co $_{0.07}$ ) $_{2}$ As $_{2}$ in high magnetic field
journal, June 2011

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journal, December 2011

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journal, December 2016

Transport properties and electronic phase diagram of single-crystalline ${Ca}_{10} ({Pt}_{3} {As}_{8}) {((Fe}_{1 - x} {Pt}_{x})_{2} {As}_{2})_{5}$
journal, June 2012

Orbital-dependent effects of electron correlations in microscopic models for iron-based superconductors
journal, April 2013

The Effect of Electron-Electron Interaction on the Nuclear Spin Relaxation in Metals
journal, April 1963

Microscopic coexistence of a two-component incommensurate spin density wave with superconductivity in underdoped NaFe $_{0.983}$ Co $_{0.017}$ As
journal, October 2013

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

Phase diagram and calorimetric properties of NaFe $_{1 - x}$ Co $_{x}$ As
journal, June 2012

59-Co and 75-As NMR Investigation of Electron-Doped High Tc Superconductor BaFe(1.8)Co(0.2)As(2) (Tc = 22K)
text, January 2008

Crossover from commensurate to incommensurate antiferromagnetism in stoichiometric NaFeAs revealed by single-crystal 23Na,75As-NMR experiments
text, January 2010

Superconductivity in Iron Compounds
text, January 2011

Spin-pairing and penetration depth measurements from nuclear magnetic resonance in NaFe$_{0.975}$Co$_{0.025}$As
text, January 2013

Orbital-dependent effects of electron correlations in microscopic models for iron-based superconductors
text, January 2013

Antiferromagnetic order and spin dynamics in iron-based superconductors
text, January 2015

Strong similarities between the local electronic structure of insulating iron pnictide and lightly doped cuprate
text, January 2015