Magnetic, thermal, and electronic-transport properties of EuMg2Bi2 single crystals

Pakhira, Santanu; Tanatar, M. A.; Johnston, D. C.

doi:10.1103/PhysRevB.101.214407

Title: Magnetic, thermal, and electronic-transport properties of EuMg₂Bi₂ single crystals

Abstract

The trigonal compound ${EuMg}_{2} {Bi}_{2}$ has recently been discussed in terms of its topological band properties. These are intertwined with its magnetic properties. In this paper detailed studies of the magnetic, thermal, and electronic-transport properties of ${EuMg}_{2} {Bi}_{2}$ single crystals are presented. The ${Eu}^{+ 2}$ spins 7/2 in ${EuMg}_{2} {Bi}_{2}$ exhibit an antiferromagnetic (AFM) transition at a temperature $T_{N} = 6.7$ K, as previously reported. By analyzing the anisotropic magnetic susceptibility $χ$ data below $T_{N}$ in terms of molecular-field theory (MFT), the AFM structure is inferred to be a $c$ -axis helix, where the ordered moments in the hexagonal $a b$ -plane layers are aligned ferromagnetically in the $a b$ plane with a turn angle between the moments in adjacent moment planes along the $c$ axis of $\approx 120^{°}$ . An alternate but less likely magnetic structure is a planar structure with nearest-neighbor Eu spins aligned at $\approx 120^{°}$ with respect to each other, where these ordered-moment layers are stacked along the $c$ axis. The magnetic heat capacity exhibits a $λ$ anomaly at $T_{N}$ with evidence of dynamic short-range magnetic fluctuations both above and below $T_{N}$ . The high- $T$ limit of the magnetic entropy is close to the theoretical value for spins 7/2. The in-plane electrical resistivity $ρ (T)$ data indicate metallic character with a mild and disorder-sensitive upturn below $T_{\min} = 23$ K. An anomalous rapid drop in $ρ (T)$ on cooling below $T_{N}$ as found in zero field is replaced by a two-step decrease in magnetic fields. The $ρ (T)$ measurements also reveal an additional transition below $T_{N}$ in applied fields of unknown origin that is not observed in the other measurements and may be associated with an incommensurate to commensurate AFM transition. The dependence of $T_{N}$ on the $c$ -axis magnetic field $H_{⊥}$ was derived from the field-dependent $χ (T)$ , $C_{p} (T)$ , and $ρ (T)$ measurements. This $T_{N} (H_{⊥})$ was found to be consistent with the prediction of MFT for a $c$ -axis helix with $S = 7 / 2$ and was used to generate a phase diagram in the $H_{⊥} – T$ plane.

Authors:

^[1];

^[2];

^[2]

Ames Lab., Ames, IA (United States)
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Publication Date:: Wed Jun 03 00:00:00 EDT 2020

Research Org.:: Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

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

OSTI Identifier:: 1631824

Report Number(s):: IS-J-10,230
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US2201031

Grant/Contract Number:: AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 101; Journal Issue: 21; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Pakhira, Santanu, Tanatar, M. A., and Johnston, D. C. Magnetic, thermal, and electronic-transport properties of EuMg2Bi2 single crystals.  United States: N. p., 2020. 
Web.  doi:10.1103/PhysRevB.101.214407.

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                    Pakhira, Santanu, Tanatar, M. A., & Johnston, D. C. Magnetic, thermal, and electronic-transport properties of EuMg2Bi2 single crystals.  United States.  https://doi.org/10.1103/PhysRevB.101.214407

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                    Pakhira, Santanu, Tanatar, M. A., and Johnston, D. C. Wed .  
"Magnetic, thermal, and electronic-transport properties of EuMg2Bi2 single crystals".  United States.  https://doi.org/10.1103/PhysRevB.101.214407.  https://www.osti.gov/servlets/purl/1631824.

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@article{osti_1631824,

  title        = {Magnetic, thermal, and electronic-transport properties of EuMg2Bi2 single crystals},

  author       = {Pakhira, Santanu and Tanatar, M. A. and Johnston, D. C.},

  abstractNote = {The trigonal compound EuMg2Bi2 has recently been discussed in terms of its topological band properties. These are intertwined with its magnetic properties. In this paper detailed studies of the magnetic, thermal, and electronic-transport properties of EuMg2Bi2 single crystals are presented. The Eu+2 spins 7/2 in EuMg2Bi2 exhibit an antiferromagnetic (AFM) transition at a temperature TN=6.7 K, as previously reported. By analyzing the anisotropic magnetic susceptibility χ data below TN in terms of molecular-field theory (MFT), the AFM structure is inferred to be a c-axis helix, where the ordered moments in the hexagonal ab-plane layers are aligned ferromagnetically in the ab plane with a turn angle between the moments in adjacent moment planes along the c axis of ≈120°. An alternate but less likely magnetic structure is a planar structure with nearest-neighbor Eu spins aligned at ≈120° with respect to each other, where these ordered-moment layers are stacked along the c axis. The magnetic heat capacity exhibits a λ anomaly at TN with evidence of dynamic short-range magnetic fluctuations both above and below TN. The high-T limit of the magnetic entropy is close to the theoretical value for spins 7/2. The in-plane electrical resistivity ρ(T) data indicate metallic character with a mild and disorder-sensitive upturn below Tmin=23 K. An anomalous rapid drop in ρ(T) on cooling below TN as found in zero field is replaced by a two-step decrease in magnetic fields. The ρ(T) measurements also reveal an additional transition below TN in applied fields of unknown origin that is not observed in the other measurements and may be associated with an incommensurate to commensurate AFM transition. The dependence of TN on the c-axis magnetic field H⊥ was derived from the field-dependent χ(T), Cp(T), and ρ(T) measurements. This TN(H⊥) was found to be consistent with the prediction of MFT for a c-axis helix with S=7/2 and was used to generate a phase diagram in the H⊥–T plane.},

  doi          = {10.1103/PhysRevB.101.214407},

  journal      = {Physical Review B},

  number       = 21,

  volume       = 101,

  place        = {United States},

  year         = {Wed Jun 03 00:00:00 EDT 2020},

  month        = {Wed Jun 03 00:00:00 EDT 2020}

}

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Title: Magnetic, thermal, and electronic-transport properties of EuMg2Bi2 single crystals

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Magnetoelectric Polarizability and Axion Electrodynamics in Crystalline Insulators journal, April 2009

Topological Insulator Materials journal, October 2013

Giant Magnetocaloric Effect in Gd5(Si2Ge2) journal, June 1997

Higher-Order Topology of the Axion Insulator EuIn 2 As 2 journal, June 2019

Role of Valence Fluctuations in the Superconductivity of Ce122 Compounds journal, August 2014

Spin Fluctuations in Normal State CeCu 2 Si 2 on Approaching the Quantum Critical Point journal, June 2011

Hedgehog spin texture and Berry’s phase tuning in a magnetic topological insulator journal, June 2012

Quantized Anomalous Hall Effect in Magnetic Topological Insulators journal, June 2010

The chiral anomaly and thermopower of Weyl fermions in the half-Heusler GdPtBi journal, June 2016

Competition between the Kondo effect and exchange interactions in the Ce Ni x Pt 1 − x compounds journal, October 1984

Helical antiferromagnetic ordering in EuNi 1.95 As 2 single crystals journal, September 2019

Title: Magnetic, thermal, and electronic-transport properties of EuMg₂Bi₂ single crystals

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

Unusual Kondo behavior in the indium-rich heavy-fermion antiferromagnet ${Ce}_{3} {Pt}_{4} {In}_{13}$
journal, November 2001

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

Topological insulators and superconductors
journal, October 2011

Structure and Properties of Single Crystalline CaMg ₂ Bi ₂ , EuMg ₂ Bi ₂ , and YbMg ₂ Bi ₂
journal, November 2011

The Quantum Anomalous Hall Effect: Theory and Experiment
journal, March 2016

Manifestation of axion electrodynamics through magnetic ordering on edges of a topological insulator
journal, August 2015

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

Dynamical axion field in topological magnetic insulators
journal, March 2010

Quantized Faraday and Kerr rotation and axion electrodynamics of a 3D topological insulator
journal, December 2016

Magnetic structure and magnetization of $z$ -axis helical Heisenberg antiferromagnets with XY anisotropy in high magnetic fields transverse to the helix axis at zero temperature
journal, June 2019

Absence of Diffusion in Certain Random Lattices
journal, March 1958

Recent advances in magnetic structure determination by neutron powder diffraction
journal, October 1993

Manipulating magnetism in the topological semimetal ${EuCd}_{2} {As}_{2}$
journal, April 2020

A 121Sb and 151Eu Mössbauer Spectroscopic Investigation of EuCd2X2 (X = P, As, Sb) and YbCd2Sb2
journal, May 2011

Evidence for spiral magnetic order in the heavy fermion material ${CeRhIn}_{5}$
journal, September 2000

Electrically Detected Interferometry of Majorana Fermions in a Topological Insulator
journal, May 2009

Effect of Eu magnetism on the electronic properties of the candidate Dirac material ${EuMnBi}_{2}$
journal, August 2014

Large magnetic cooling power involving frustrated antiferromagnetic spin-glass state in $R_{2} {NiSi}_{3} (R = Gd, Er)$
journal, September 2016

Magnetic and electronic structure of Dirac semimetal candidate ${EuMnSb}_{2}$
journal, November 2019

Experimental Detection of a Majorana Mode in the core of a Magnetic Vortex inside a Topological Insulator-Superconductor ${Bi}_{2} {Te}_{3} / {NbSe}_{2}$ Heterostructure
journal, January 2015

Destruction of Superconductivity at the Onset of Long-Range Magnetic Order in the Compound Er ${Rh}_{4}$ $B_{4}$
journal, April 1977

Revival of the Kondo effect
journal, January 2001

Topological quantization of the spin Hall effect in two-dimensional paramagnetic semiconductors
journal, August 2006

Neutron diffraction and polarimetric study of the magnetic and crystal structures of HoMnO ₃ and YMnO ₃
journal, October 2006

Topological field theory of time-reversal invariant insulators
journal, November 2008

Strong valence fluctuation effects in Sm $T r_{2}$ Al $_{20}$ ( $T r = Ti$ , V, Cr)
journal, November 2011

Majorana fermions in a topological-insulator nanowire proximity-coupled to an $s$ -wave superconductor
journal, November 2011

${Y b R h}_{2} {S i}_{2}$ : Spin Fluctuations in the Vicinity of a Quantum Critical Point at Low Magnetic Field
journal, August 2002

Thermoelectric transport properties of CaMg $_{2}$ Bi $_{2}$ , EuMg $_{2}$ Bi $_{2}$ , and YbMg $_{2}$ Bi $_{2}$
journal, January 2012

Bulk superconductivity at an elevated temperature ( $T_{c}$ ≊12 K) in a nickel containing alloy system Y-Ni-B-C
journal, January 1994

Influence of uniaxial single-ion anisotropy on the magnetic and thermal properties of Heisenberg antiferromagnets within unified molecular field theory
journal, March 2017

Site preferences and bond length differences in CaAl2Si2-type Zintl compounds
journal, April 1986

Magnetotransport study of Dirac fermions in ${YbMnBi}_{2}$ antiferromagnet
journal, October 2016

The birth of topological insulators
journal, March 2010

Heat Transport as a Probe of Electron Scattering by Spin Fluctuations: The Case of Antiferromagnetic ${CeRhIn}_{5}$
journal, June 2005

Magnetic structure and magnetization of helical antiferromagnets in high magnetic fields perpendicular to the helix axis at zero temperature
journal, September 2017

Magnetic topological insulators
journal, January 2019

Magnetic frustration induced large magnetocaloric effect in the absence of long range magnetic order
journal, August 2017

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

Theory of commensurable magnetic structures in holmium
journal, August 1996

Evidence for the Presence of the kondo effect in the Compound Ce ${Al}_{2}$
journal, August 1969

Topological insulators with inversion symmetry
journal, July 2007

Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
journal, March 2013

Quantum Anomalous Hall Effect in ${Hg}_{1 - y} {Mn}_{y} Te$ Quantum Wells
journal, October 2008

Colloquium: Topological insulators
journal, November 2010

Dielectric and magnetic anomalies and spin frustration in hexagonal $R {MnO}_{3}$ $(R = Y,$ Yb, and Lu)
journal, August 2001

Susceptibility, Magnetization Process and ESR Studies on the Helical Spin System RbCuCl ₃
journal, March 2001

Synthesis and characterization of the divalent samarium Zintl-phases SmMg2Bi2 and SmMg2Sb2
journal, November 2015

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

Majorana fermions in the Kitaev quantum spin system α-RuCl3
journal, September 2017

Inverse Spin-Galvanic Effect in the Interface between a Topological Insulator and a Ferromagnet
journal, April 2010

Magnetoelectric Polarizability and Axion Electrodynamics in Crystalline Insulators
journal, April 2009

Topological Insulator Materials
journal, October 2013

Giant Magnetocaloric Effect in ${Gd}_{5} ({Si}_{2} {Ge}_{2})$
journal, June 1997

Higher-Order Topology of the Axion Insulator ${EuIn}_{2} {As}_{2}$
journal, June 2019

Role of Valence Fluctuations in the Superconductivity of Ce122 Compounds
journal, August 2014

Spin Fluctuations in Normal State ${CeCu}_{2} {Si}_{2}$ on Approaching the Quantum Critical Point
journal, June 2011

Hedgehog spin texture and Berry’s phase tuning in a magnetic topological insulator
journal, June 2012

Quantized Anomalous Hall Effect in Magnetic Topological Insulators
journal, June 2010

The chiral anomaly and thermopower of Weyl fermions in the half-Heusler GdPtBi
journal, June 2016

Competition between the Kondo effect and exchange interactions in the $Ce {Ni}_{x} {Pt}_{1 - x}$ compounds
journal, October 1984

Helical antiferromagnetic ordering in ${EuNi}_{1.95} {As}_{2}$ single crystals
journal, September 2019