Ferromagnetic cluster-glass phase in Ca(Co1-xIrx)2-yAs2 crystals

Pakhira, Santanu; Sangeetha, N. S.; Smetana, V.; Mudring, A.-V.; Johnston, D. C.

doi:10.1103/physrevb.102.024410

Title: Ferromagnetic cluster-glass phase in Ca(Co_1-xIr_x)_2-yAs₂ crystals

Abstract

In this study, single crystals of Ca(Co_1-xIr_x)_2-yAs₂ with 0≤x≤0.35 and 0.10≤y≤0.14 have been grown using the self-flux technique and characterized by single-crystal x-ray diffraction (XRD), energy-dispersive x-ray spectroscopy, magnetization M, and magnetic susceptibility χ measurements versus temperature T, magnetic field H, and time t, and heat-capacity C_p(H,T) measurements. The XRD refinements reveal that all the Ir-substituted crystals crystallize in a collapsed-tetragonal structure as does the parent CaCo_2-yAs₂ compound. A small 3.3% Ir substitution for Co in CaCo_1.86As₂ drastically lowers the A-type antiferromagnetic (AFM) transition temperature T_N from 52 to 23 K with a significant enhancement of the Sommerfeld electronic heat-capacity coefficient. The A-type AFM structure consists of ab-plane layers of spins ferromagnetically aligned along the c axis with AFM alignment of the spins in adjacent layers along this axis. The positive Weiss temperatures obtained from Curie-Weiss fits to the χ(T>T_N) data indicate that the dominant magnetic interactions are ferromagnetic (FM) for all x. A magnetic phase boundary is inferred to be present between x=0.14 and x=0.17 from a discontinuity in the x dependencies of the effective moment and Weiss temperature in the Curie-Weiss fits. FM fluctuations that strongly increase with increasing x are also revealed from the χ(T) data. Furthermore,more »« less

Authors:

^[1]; Sangeetha, N. S. ^[1];

^[2]; Mudring, A.-V. ^[2];

^[3]

Ames Lab., Ames, IA (United States)
Stockholm Univ. (Sweden)
Ames Lab., and Iowa State Univ., Ames, IA (United States)

Publication Date:: Tue Jul 07 00:00:00 EDT 2020

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

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

OSTI Identifier:: 1639043

Report Number(s):: IS-J-10,265
Journal ID: ISSN 2469-9950; TRN: US2201836

Grant/Contract Number:: AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 102; Journal Issue: 2; 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; critical field; crystal stoichiometry; crystal structure; magnetic susceptibility; magnetism; magnetization dynamics; phase diagrams; specific heat; spin glasses

Citation Formats


                    Pakhira, Santanu, Sangeetha, N. S., Smetana, V., Mudring, A.-V., and Johnston, D. C. Ferromagnetic cluster-glass phase in Ca(Co1-xIrx)2-yAs2 crystals.  United States: N. p., 2020. 
Web.  doi:10.1103/physrevb.102.024410.

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                    Pakhira, Santanu, Sangeetha, N. S., Smetana, V., Mudring, A.-V., & Johnston, D. C. Ferromagnetic cluster-glass phase in Ca(Co1-xIrx)2-yAs2 crystals.  United States.  https://doi.org/10.1103/physrevb.102.024410

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                    Pakhira, Santanu, Sangeetha, N. S., Smetana, V., Mudring, A.-V., and Johnston, D. C. Tue .  
"Ferromagnetic cluster-glass phase in Ca(Co1-xIrx)2-yAs2 crystals".  United States.  https://doi.org/10.1103/physrevb.102.024410.  https://www.osti.gov/servlets/purl/1639043.

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@article{osti_1639043,

  title        = {Ferromagnetic cluster-glass phase in Ca(Co1-xIrx)2-yAs2 crystals},

  author       = {Pakhira, Santanu and Sangeetha, N. S. and Smetana, V. and Mudring, A.-V. and Johnston, D. C.},

  abstractNote = {In this study, single crystals of Ca(Co1-xIrx)2-yAs2 with 0≤x≤0.35 and 0.10≤y≤0.14 have been grown using the self-flux technique and characterized by single-crystal x-ray diffraction (XRD), energy-dispersive x-ray spectroscopy, magnetization M, and magnetic susceptibility χ measurements versus temperature T, magnetic field H, and time t, and heat-capacity Cp(H,T) measurements. The XRD refinements reveal that all the Ir-substituted crystals crystallize in a collapsed-tetragonal structure as does the parent CaCo2-yAs2 compound. A small 3.3% Ir substitution for Co in CaCo1.86As2 drastically lowers the A-type antiferromagnetic (AFM) transition temperature TN from 52 to 23 K with a significant enhancement of the Sommerfeld electronic heat-capacity coefficient. The A-type AFM structure consists of ab-plane layers of spins ferromagnetically aligned along the c axis with AFM alignment of the spins in adjacent layers along this axis. The positive Weiss temperatures obtained from Curie-Weiss fits to the χ(T>TN) data indicate that the dominant magnetic interactions are ferromagnetic (FM) for all x. A magnetic phase boundary is inferred to be present between x=0.14 and x=0.17 from a discontinuity in the x dependencies of the effective moment and Weiss temperature in the Curie-Weiss fits. FM fluctuations that strongly increase with increasing x are also revealed from the χ(T) data. Furthermore, the magnetic ground state for x≥0.17 is a spin glass as indicated by hysteresis in χ(T) between field-cooled and zero-field-cooled measurements and from the relaxation of M in a small field that exhibits a stretched-exponential time dependence. The spin glass has a small FM component to the ordering and is hence inferred to be comprised of small FM clusters. The competing AFM and FM interactions along with crystallographic disorder associated with Ir substitution are inferred to be responsible for the development of a FM cluster-glass phase. A logarithmic T dependence of Cp at low T for x=0.14 is consistent with the presence of significant FM quantum fluctuations. This composition is near the T=0 boundary at x≈0.16 between the A-type AFM phase containing ferromagnetically-aligned layers of spins and the FM cluster-glass phase.},

  doi          = {10.1103/physrevb.102.024410},

  journal      = {Physical Review B},

  number       = 2,

  volume       = 102,

  place        = {United States},

  year         = {Tue Jul 07 00:00:00 EDT 2020},

  month        = {Tue Jul 07 00:00:00 EDT 2020}

}

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Short-range ferromagnetic order due to Ir substitutions in single-crystalline Ba(Co_1-xIr_x)₂As₂ (0 ≤ x ≤ 0.25)

Journal Article Pakhira, Santanu ; Sangeetha, N. S. ; Smetana, V. ; ... - Journal of Physics. Condensed Matter

The ternary-arsenide compound BaCo₂As₂ was previously proposed to be in proximity to a quantum-critical point where long-range ferromagnetic (FM) order is suppressed by quantum fluctuations. In this paper we report the effect of Ir substitutions for Co on the magnetic and thermal properties of Ba(Co_1-xIr_x)₂As₂ (0 ≤ x ≤ 0.25) single crystals. These compositions all crystallize in an uncollapsed body-centered-tetragonal ThCr₂Si₂ structure with space group I4/mmm. Magnetic susceptibility measurements reveal clear signatures of short-range FM ordering for x ≥ 0.11 below a nearly composition-independent characteristic temperature T_cl ≈ 13 K. The small variation of T_cl with x, thermomagnetic irreversibility betweenmore »« less
https://doi.org/10.1088/1361-648x/abd339

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Title: Ferromagnetic cluster-glass phase in Ca(Co1-xIrx)2-yAs2 crystals

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Title: Ferromagnetic cluster-glass phase in Ca(Co_1-xIr_x)_2-yAs₂ crystals

Dynamic measurements in a Heisenberg spin glass: CuMn
journal, May 1994

Pressure-induced unconventional superconductivity near a quantum critical point in CaFe ₂ As ₂
journal, April 2010

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

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

Field-induced spin-flop transitions in single-crystalline CaCo $_{2}$ As $_{2}$
journal, April 2012

Metamagnetic transition in Ca $_{1 - x}$ Sr $_{x}$ Co $_{2}$ As $_{2}$ ( $x$ $=$ 0 and 0.1) single crystals
journal, June 2012

Prominent Role of Spin-Orbit Coupling in FeSe Revealed by Inelastic Neutron Scattering
journal, May 2017

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

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

VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data
journal, October 2011

Coexistence of ferromagnetic and glassy behavior in the ${La}_{0.5} {Sr}_{0.5} {CoO}_{3}$ perovskite compound
journal, February 1999

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journal, July 2014

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

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journal, July 2019

High-temperature superconductivity in iron-based materials
journal, August 2010

Superconductivity in iron compounds
journal, December 2011

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

Superconductivity and spin–orbit coupling in non-centrosymmetric materials: a review
journal, January 2017

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

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

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

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

Time decay of the remanent magnetization in a Cu Mn spin glass
journal, January 1986

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

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

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

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

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

The role of spin-orbit coupling for the superconducting state in Sr ₂ RuO ₄
journal, February 2000

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

Crystal structure refinement with SHELXL
journal, January 2015

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
journal, September 2019

Stretched exponential relaxation arising from a continuous sum of exponential decays
journal, November 2006

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

Effects of Impurities on Spin Fluctuations in Almost Ferromagnetic Metals
journal, June 1968

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

Role of spin-orbit coupling and evolution of the electronic structure of ${WTe}_{2}$ under an external magnetic field
journal, September 2015

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

Orbital Magnetism and Spin-Orbit Effects in the Electronic Structure of ${BaIrO}_{3}$
journal, November 2010

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

Bulk superconductivity at 2.6 K in undoped RbFe2As2
journal, December 2010

Competing Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR
journal, September 2015

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

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journal, May 2019

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journal, November 2003

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journal, April 2010

Crystal and magnetic structure of CaCo $_{1.86}$ As $_{2}$ studied by x-ray and neutron diffraction
journal, November 2013

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journal, September 2008

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journal, October 1986

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journal, January 2012

Magnetism and its microscopic origin in iron-based high-temperature superconductors
journal, October 2012

Renormalized behavior and proximity of ${BaCo}_{2} {As}_{2}$ to a magnetic quantum critical point
journal, January 2009

Evolution of the bulk properties, structure, magnetic order, and superconductivity with Ni doping in ${CaFe}_{2 - x} {Ni}_{x} {As}_{2}$
journal, October 2009

Stripe Antiferromagnetic Spin Fluctuations in ${SrCo}_{2} {As}_{2}$
journal, October 2013

Effect of a nonzero temperature on quantum critical points in itinerant fermion systems
journal, September 1993

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

Magnetic phase inhomogeneity in frustrated intermetallic compound Sm2Ni0.87Si2.87
journal, April 2018

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

Effective One-Dimensional Coupling in the Highly Frustrated Square-Lattice Itinerant Magnet ${CaCo}_{2 - y} {As}_{2}$
journal, October 2017

Competing magnetic phases and itinerant magnetic frustration in ${SrCo}_{2} {As}_{2}$
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Magnetic relaxation phenomena and cluster glass properties of ${La}_{0.7 - x} Y_{x} {Ca}_{0.3} {MnO}_{3}$ manganites
journal, September 2001

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

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journal, October 2019