Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in Sr(Co1-xNix)2As2 single crystals

Sangeetha, N. S.; Wang, L. -L.; Smirnov, A. V.; Smetana, V.; Mudring, A. -V.; Johnson, D. D.; Tanatar, M. A.; Prozorov, R.; Johnston, D. C.

doi:10.1103/PhysRevB.100.094447

Title: Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in $Sr {({Co}_{1 - x} {Ni}_{x})}_{2} {As}_{2}$ single crystals

Abstract

The compound SrCo₂As₂ with the body-centered tetragonal ThCr₂Si₂ structure is known to remain paramagnetic down to a temperature T = 0.05 K, but inelastic neutron scattering studies have shown that both ferromagnetic (FM) and antiferromagnetic (AFM) fluctuations occur in single crystals. Thus it is of interest to study how the magnetism evolves on doping SrCo₂As₂. Previous work on polycrystalline samples of Sr (Co_1-x Ni_x)₂ As₂ indicated the development of AFM order for 0 < x ≲ 0.3. Here we studied single crystals of Sr(Co_1-x Ni_x)₂ As₂ for 0 < x ≤ 1 and confirmed the occurrence of AFM order which we deduce to have a c -axis helix structure. We also find evidence for an unusual composition-induced magnetic quantum critical point at x ≈ 0.3 where non-Fermi-liquid types of behavior were revealed by heat capacity and electrical resisitivity measurements at low T. Electron-doped Sr (Co_1-x Ni_x)₂ As₂ single crystals with compositions x = 0 to 0.9 were grown out of self-flux and SrNi₂ As₂ single crystals out of Bi flux. The crystals were characterized using single-crystal x-ray diffraction (XRD) at room temperature, and magnetic susceptibility χ (H, T), isothermal magnetization M (H, T), heat capacity Cp (H, T), and electricalmore »« less

Authors:

Sangeetha, N. S. ^[1]; Wang, L. -L. ^[1]; Smirnov, A. V. ^[1];

^[2];

^[3]; Tanatar, M. A. ^[4]; Prozorov, R. ^[4];

^[4]

Ames Lab., and Iowa State Univ., Ames, IA (United States)
Stockholm Univ. (Sweden)
Iowa State Univ., Ames, IA (United States). Dept. of Materials Science & Engineering
Ames Lab., and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy

Publication Date:: 2019-09-30

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

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

OSTI Identifier:: 1570834

Report Number(s):: IS-J-10060
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US2100040

Grant/Contract Number:: AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 100; Journal Issue: 9; 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

Citation Formats


                    Sangeetha, N. S., Wang, L. -L., Smirnov, A. V., Smetana, V., Mudring, A. -V., Johnson, D. D., Tanatar, M. A., Prozorov, R., and Johnston, D. C. Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in Sr(Co1-xNix)2As2 single crystals.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevB.100.094447.

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                    Sangeetha, N. S., Wang, L. -L., Smirnov, A. V., Smetana, V., Mudring, A. -V., Johnson, D. D., Tanatar, M. A., Prozorov, R., & Johnston, D. C. Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in Sr(Co1-xNix)2As2 single crystals.  United States.  https://doi.org/10.1103/PhysRevB.100.094447

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                    Sangeetha, N. S., Wang, L. -L., Smirnov, A. V., Smetana, V., Mudring, A. -V., Johnson, D. D., Tanatar, M. A., Prozorov, R., and Johnston, D. C. Mon .  
"Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in Sr(Co1-xNix)2As2 single crystals".  United States.  https://doi.org/10.1103/PhysRevB.100.094447.  https://www.osti.gov/servlets/purl/1570834.

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@article{osti_1570834,

  title        = {Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in Sr(Co1-xNix)2As2 single crystals},

  author       = {Sangeetha, N. S. and Wang, L. -L. and Smirnov, A. V. and Smetana, V. and Mudring, A. -V. and Johnson, D. D. and Tanatar, M. A. and Prozorov, R. and Johnston, D. C.},

  abstractNote = {The compound SrCo2As2 with the body-centered tetragonal ThCr2Si2 structure is known to remain paramagnetic down to a temperature T = 0.05 K, but inelastic neutron scattering studies have shown that both ferromagnetic (FM) and antiferromagnetic (AFM) fluctuations occur in single crystals. Thus it is of interest to study how the magnetism evolves on doping SrCo2As2. Previous work on polycrystalline samples of Sr (Co1-x Nix)2 As2 indicated the development of AFM order for 0 < x ≲ 0.3. Here we studied single crystals of Sr(Co1-x Nix)2 As2 for 0 < x ≤ 1 and confirmed the occurrence of AFM order which we deduce to have a c -axis helix structure. We also find evidence for an unusual composition-induced magnetic quantum critical point at x ≈ 0.3 where non-Fermi-liquid types of behavior were revealed by heat capacity and electrical resisitivity measurements at low T. Electron-doped Sr (Co1-x Nix)2 As2 single crystals with compositions x = 0 to 0.9 were grown out of self-flux and SrNi2 As2 single crystals out of Bi flux. The crystals were characterized using single-crystal x-ray diffraction (XRD) at room temperature, and magnetic susceptibility χ (H, T), isothermal magnetization M (H, T), heat capacity Cp (H, T), and electrical resistivity ρ (H, T) measurements versus applied magnetic field H and T. The XRD studies show that the system undergoes a continuous structural crossover from the uncollapsed-tetragonal (ucT) structure to the collapsed tetragonal (cT) structure with increasing Ni doping. The χ(T) data show that SrCo2As2 exhibits an AFM ground state almost immediately upon Ni doping on the Co site. Ab initio electronic-structure calculations for x = 0 and 0.15 indicate that a flat band with a peak in the density of states just above the Fermi energy is responsible for this initial magnetic-ordering behavior on Ni doping. The AFM ordering is observed in the range 0.013 ≤ x ≤ 0.25 with the ordered moments aligned in the ab plane and with a maximum ordering temperature TN = 26.5 K at x = 0.10. The Curie-Weiss-like T dependence of χ in the paramagnetic (PM) state indicates dominant FM interactions. The behavior of the anisotropic susceptibilities below TN suggests a planar helical magnetic ground state with a composition-dependent pitch based on a local-moment molecular-field-theory model, with FM interactions in the ab plane and weaker AFM interactions along the helix c axis. However, the small ordered (saturation) moments ~0.1 μB per transition metal atom, where μB is the Bohr magneton, and the values of the Rhodes-Wohlfarth ratio indicate that the magnetism is itinerant. The high-field M (H) isotherms and the low-field χ-1 ( T > TN) data were successfully analyzed within the framework of Takahashi's theory of FM spin fluctuations. The Cp (T) at low T exhibits Fermi-liquid behavior for 0 ≤ x ≤ 0.15 , whereas an evolution to a logarithmic non-Fermi-liquid (NFL) behavior is found for x = 0.2 to 0.3. The logarithmic dependence is suppressed in an applied magnetic field. The low- T ρ ( H = 0 , T ) data show a T2 dependence for 0 ≤ x ≤ 0.20 and a power-law dependence ρ (H = 0, T) = ρ0 + ATn with n < 2 for x = 0.20 and 0.30. The exponent n shows a notable field dependence, suggesting both doping- and magnetic-field-tuned quantum critical phenomena. These low- T NFL types of behavior observed in the Cp and ρ measurements are most evident near the quantum critical concentration x ≈ 0.3 at which a T = 0 composition-induced transition from the AFM phase to the PM phase occurs.},

  doi          = {10.1103/PhysRevB.100.094447},

  journal      = {Physical Review B},

  number       = 9,

  volume       = 100,

  place        = {United States},

  year         = {2019},

  month        = {9}

}

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Figures / Tables:

FIG. 1: Unit cell of the crystal structures of uncollapsed-tetragonal (ucT) SrCo₂As₂ and collapsed-tetragonal (cT) SrNi₂As₂ together with selected structural parameters.

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Mun, E. D.; Bud'ko, S. L.; Martin, C.
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Dai, Pengcheng
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text, January 2016

Si, Qimiao; Yu, Rong; Abrahams, Elihu
arXiv
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Collinear antiferromagnetism in trigonal SrMn$_{2}$As$_{2}$ revealed by single-crystal neutron diffraction
text, January 2016

Das, Pinaki; Sangeetha, N. S.; Pandey, Abhishek
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Enhanced moments of Eu in single crystals of the metallic helical antiferromagnet EuCo{2-y}As2
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Sangeetha, N. S.; Anand, V. K.; Cuervo-Reyes, Eduardo
arXiv
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Helical magnetic ordering in $Sr {({Co}_{1 - x} {Ni}_{x})}_{2} {As}_{2}$

Journal Article Wilde, John M. ; Kreyssig, A. ; Vaknin, D. ; ... - Physical Review B

SrCo₂As₂ is a peculiar itinerant magnetic system that does not order magnetically, but inelastic neutron-scattering experiments observe the same stripe-type antiferromagnetic (AF) fluctuations found in many of the Fe-based superconductors along with evidence of magnetic frustration. Here we present results from neutron diffraction measurements on single crystals of Sr(Co_1-xNi_x)₂As₂ that show the development of long-range AF order with Ni doping. However, the AF order is not stripe type. Rather, the magnetic structure consists of ferromagnetically aligned (FM) layers (with moments laying in the layer) that are AF arranged along c with an incommensurate propagation vector of (0 0 τ), i.e.,more »« less
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https://doi.org/10.1103/PhysRevB.100.161113

Full Text Available
Antiferromagnetism in semiconducting ${SrMn}_{2} {Sb}_{2}$ and ${BaMn}_{2} {Sb}_{2}$ single crystals

Journal Article Sangeetha, N. S. ; Smetana, V. ; Mudring, A. -V. ; ... - Physical Review B

Here, crystals of SrMn₂Sb₂ and BaMn₂Sb₂ were grown using Sn flux and characterized by powder and single-crystal x-ray diffraction, respectively, and by single-crystal electrical resistivity ρ, heat capacity C_p, and magnetic susceptibility χ measurements versus temperature T, and magnetization versus field M(H) isotherm measurements. SrMn₂Sb₂ adopts the trigonal CaAl₂Si₂-type structure, whereas BaMn₂Sb₂ crystallizes in the tetragonal ThCr₂Si₂-type structure. The ρ(T) data indicate semiconducting behaviors for both compounds with activation energies of ≳0.35 eV for SrMn₂Sb₂ and 0.16 eV for BaMn₂Sb₂. The χ(T) and C_p(T) data reveal antiferromagnetic (AFM) ordering at T_N = 110 K for SrMn₂Sb₂ and 450 K formore »« less
Cited by 20
https://doi.org/10.1103/PhysRevB.97.014402

Full Text Available
Anomalous Composition-Induced Crossover in the Magnetic Properties of the Itinerant-Electron Antiferromagnet ${Ca}_{1 - x} {Sr}_{x} {Co}_{2 - y} {As}_{2}$

Journal Article Sangeetha, N. S. ; Smetana, V. ; Mudring, A. -V. ; ... - Physical Review Letters

We report the inference of Ying et al. [Europhys. Lett. 104, 67005 (2013)] of a composition-induced change from c-axis ordered-moment alignment in a collinear A-type antiferromagnetic (AFM) structure at small x to ab-plane alignment in an unknown AFM structure at larger x in Ca_1-xSr_xCo_2-yAs₂ with the body-centered tetragonal ThCr₂Si₂ structure is confirmed. Our major finding is an anomalous magnetic behavior in the crossover region 0.2 ≲ x ≲ 0.3 between these two phases. Also, in this region the magnetic susceptibility vs temperature χ_ab(T) measured with magnetic fields H applied in the ab plane exhibit typical AFM behaviors with cusps atmore »« less
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Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator ${EuMn}_{2} {As}_{2}$

Journal Article Anand, V. K. ; Johnston, D. C. - Physical Review B

Here, we report magnetic susceptibility χ, isothermal magnetization M, heat capacity C_p, and electrical resistivity ρ measurements on undoped EuMn₂As₂ and K-doped Eu_0.96K_0.04Mn₂As₂ and Eu_0.93K_0.07Mn₂As₂ single crystals with the trigonal CaAl₂Si₂-type structure as a function of temperature T and magnetic field H. EuMn₂As₂ has an insulating ground state with an activation energy of 52 meV and exhibits antiferromagnetic (AFM) ordering of the Eu⁺² spins S=7/2 at T_N1=15 K from C_p(T) and χ(T) data with a likely spin-reorientation transition at T_N2=5.0 K. The Mn⁺² 3d⁵ spins-5/2 exhibit AFM ordering at T_N=142 K from all three types of measurements. The M(H) isothermmore »« less
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https://doi.org/10.1103/PhysRevB.94.014431

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Journal Article Campanini, D. ; Diao, Z. ; Fang, L. ; ... - Physical Review. B, Condensed Matter and Materials Physics

We report on specific heat measurements on clean overdoped BaFe₂(As_1-xP_x)₂ single crystals performed with a high resolution membrane-based nanocalorimeter. A nonzero residual electronic specific heat coefficient at zero temperature γ_r = C/T |_{T→ 0} is seen for all doping compositions, indicating a considerable fraction of the Fermi surface ungapped or having very deep minima. The remaining superconducting electronic specific heat is analyzed through a two-band s-wave alpha model in order to investigate the gap structure. Close to optimal doping we detect a single zero-temperature gap of Δ₀ ~ 5.3 meV, corresponding to Δ₀/k_BT_c ~ 2.2. Increasing the phosphorus concentration x, the main gap reduces till a value of Δ₀ ~ 1.9 meV for x = 0.55 and a second weaker gap becomes evident. From the magnetic field effect on γ_r, all samples however show similar behavior γ_r(H)more »« less
https://doi.org/10.1103/PhysRevB.91.245142

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Title: Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in Sr ( Co 1 - x Ni x ) 2 As 2 single crystals

Abstract

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Inhomogeneous Electron Gas journal, November 1964

Iron-based superconductors: Current status of materials and pairing mechanism journal, July 2015

Quantum criticality journal, January 2005

Title: Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in $Sr {({Co}_{1 - x} {Ni}_{x})}_{2} {As}_{2}$ single crystals

Enhanced moments of Eu in single crystals of the metallic helical antiferromagnet ${EuCo}_{2 - y} {As}_{2}$
journal, April 2018

Very Weak Itinerant Ferromagnets; Application to ZrZn ₂
journal, February 1968

${EuCo}_{2} P_{2}$ : A model molecular-field helical Heisenberg antiferromagnet
journal, July 2016

Crystallographic, electronic, thermal, and magnetic properties of single-crystal SrCo $_{2}$ As $_{2}$
journal, July 2013

Coherent-Potential Approximation for a Nonoverlapping-Muffin-Tin-Potential Model of Random Substitutional Alloys
journal, March 1972

Electron Doping Effect on AeCo2As2 (Ae = Ca, Sr and Ba)
journal, January 2015

Comparison of silver and molybdenum microfocus X-ray sources for single-crystal structure determination
journal, January 2015

Magnetic order in ${BaMn}_{2} {As}_{2}$ from neutron diffraction measurements
journal, September 2009

Photoelectroluminescence with Visible Response
journal, May 1957

Field-Induced Quantum Critical Point in ${C e C o I n}_{5}$
journal, December 2003

Erratum: Phenomenology of the normal state of Cu-O high-temperature superconductors [Phys. Rev. Lett. 63, 1996 (1989)]
journal, January 1990

Antiferromagnetic stacking of ferromagnetic layers and doping-controlled phase competition in ${Ca}_{1 - x} {Sr}_{x} {Co}_{2 - y} {As}_{2}$
journal, July 2019

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

SHELXT – Integrated space-group and crystal-structure determination
journal, January 2015

Normal State Properties of High-Temperature Superconductors and the Marginal Fermi Liquid
journal, December 1996

Relation between the specific heat and susceptibility of an antiferromagnet
journal, October 1962

Self-Consistent Equations Including Exchange and Correlation Effects
journal, November 1965

Density-Functional Theory for Random Alloys: Total Energy within the Coherent-Potential Approximation
journal, May 1986

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

Different resistivity response to spin-density wave and superconductivity at 20 K in Ca _{1− x} Na _x Fe ₂ As ₂
journal, September 2008

Equations of state along the road to Arrott's last plot
journal, May 2010

Non-Fermi-liquid behavior in $d$ - and $f$ -electron metals
journal, October 2001

Optical properties of the iron-pnictide analog BaMn $_{2}$ As $_{2}$
journal, July 2012

Ferromagnetic behavior induced by La-doping in SrCo ₂ As ₂
journal, January 2018

Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set
journal, July 1996

Antiferromagnetism in semiconducting ${SrMn}_{2} {Sb}_{2}$ and ${BaMn}_{2} {Sb}_{2}$ single crystals
journal, January 2018

Angle-resolved photoemission observation of Mn-pnictide hybridization and negligible band structure renormalization in ${BaMn}_{2} {As}_{2}$ and ${BaMn}_{2} {Sb}_{2}$
journal, October 2016

Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in ${SrCo}_{2} {As}_{2}$
journal, March 2019

Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set
journal, October 1996

Flat-band magnetism and helical magnetic order in Ni-doped ${SrCo}_{2} {As}_{2}$
journal, September 2019

Magnetic field induced non-Fermi-liquid behavior in YbAgGe single crystals
journal, January 2004

Phenomenology of the normal state of Cu-O high-temperature superconductors
journal, October 1989

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

Itinerant ferromagnetism induced by electron doping in SrCo2As2
journal, May 2019

Criterion for Ferromagnetism from Observations of Magnetic Isotherms
journal, December 1957

Transport near a quantum critical point in BaFe2(As1−xPx)2
journal, January 2014

What drives nematic order in iron-based superconductors?
journal, January 2014

Collinear antiferromagnetism in trigonal SrMn ₂ As ₂ revealed by single-crystal neutron diffraction
journal, November 2016

Scattering and Pairing in Cuprate Superconductors
journal, August 2010

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

A common thread: The pairing interaction for unconventional superconductors
journal, October 2012

Strong magnetic correlations to 900 K in single crystals of the trigonal antiferromagnetic insulators ${SrMn}_{2} {As}_{2}$ and ${CaMn}_{2} {As}_{2}$
journal, September 2016

The effect of spin-glass ordering on the specific heat of Mn
journal, February 1983

Quantum critical fluctuations in layered YFe ₂ Al ₁₀
journal, September 2014

Field-dependent transport critical current in single crystals of Ba(Fe _{1 − x} TM _x ) ₂ As ₂ (TM = Co, Ni) superconductors
journal, April 2010

Magnetic Susceptibility of Collinear and Noncollinear Heisenberg Antiferromagnets
journal, August 2012

Low temperature thermal and electrical transport properties of ZrZn ₂ in high magnetic field
journal, December 2012

The magnetic phase diagram of Ca _1−x Sr _x Co ₂ As ₂ single crystals
journal, December 2013

Resistive Anomalies at Magnetic Critical Points
journal, March 1968

The break-up of heavy electrons at a quantum critical point
journal, July 2003

Magnetic structure and spin excitations in ${BaMn}_{2} {Bi}_{2}$
journal, February 2014

Anisotropy of the iron pnictide superconductor $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ $(x = 0.074, T_{c} = 23 K)$
journal, March 2009

First-order phase transitions in EuCo $_{2}$ P $_{2}$ and SrNi $_{2}$ P $_{2}$
journal, December 1997

Lattice collapse and the magnetic phase diagram of ${Sr}_{1 - x} {Ca}_{x} {Co}_{2} P_{2}$
journal, October 2009

Addendum: Non-Fermi-liquid behavior in $d$ - and $f$ -electron metals
journal, July 2006

Coexistence of antiferromagnetic and ferromagnetic spin correlations in ${SrCo}_{2} {As}_{2}$ revealed by ${}^{59}{Co}$ and ${}^{75}{As}$ NMR
journal, June 2015

Superconductivity in iron compounds
journal, December 2011

Quantum Phase Transitions in the Itinerant Ferromagnet ${Z r Z n}_{2}$
journal, December 2004

Colloquium : The unexpected properties of alkali metal iron selenide superconductors
journal, May 2013

Complete Solution of the Korringa-Kohn-Rostoker Coherent-Potential-Approximation Equations: Cu-Ni Alloys
journal, July 1978

Magnetic, transport, and thermal properties of single crystals of the layered arsenide ${BaMn}_{2} {As}_{2}$
journal, March 2009

Fermi-liquid, non-Fermi-liquid, and Mott phases in iron pnictides and cuprates
journal, February 2010

Structural, thermal, magnetic, and electronic transport properties of the LaNi $_{2}$ (Ge $_{1 - x}$ P $_{x}$ ) $_{2}$ system
journal, February 2012

Ferromagnetic quantum critical point induced by dimer-breaking in SrCo2(Ge1−xPx)2
journal, January 2011

Special points for Brillouin-zone integrations
journal, June 1976

Non-Fermi liquids
journal, March 1999

Field dependence of the specific heat of single-crystalline ZrZn2
journal, May 2001

Transport and thermodynamic evidence for a marginal Fermi-liquid state in ZrZn $_{2}$
journal, January 2012

Ferromagnetism versus Antiferromagnetism in Face-Centered-Cubic Iron
journal, May 1986

Pressure-induced Transition of the Sublattice Magnetization in ${EuCo}_{2} P_{2}$ : Change from Local Moment $Eu (4 f)$ to Itinerant $Co (3 d)$ Magnetism
journal, January 1998

Crystal structure refinement with SHELXL
journal, January 2015

Unified molecular field theory for collinear and noncollinear Heisenberg antiferromagnets
journal, February 2015

Anomalous Composition-Induced Crossover in the Magnetic Properties of the Itinerant-Electron Antiferromagnet ${Ca}_{1 - x} {Sr}_{x} {Co}_{2 - y} {As}_{2}$
journal, December 2017

Inhomogeneous Electron Gas
journal, November 1964

Iron-based superconductors: Current status of materials and pairing mechanism
journal, July 2015

Quantum criticality
journal, January 2005

Formation of collapsed tetragonal phase in EuCo ₂ As ₂ under high pressure
journal, October 2010

Non-Fermi-Liquid Behavior at a Ferromagnetic Quantum Critical Point in ${Ni}_{x} {Pd}_{1 - x}$
journal, May 1999

Emergence of superconductivity from fully incoherent normal state in an iron-based superconductor (Ba0.6K0.4)Fe2As2
journal, January 2019