Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo2

Mudryk, Y.; Paudyal, D.; Pathak, A. K.; Pecharsky, V. K.; Gschneidner, Jr., K. A.

doi:10.1039/C6TC00867D

Title: Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo₂

Abstract

The nature of multiple magnetostructural transformations in HoCo₂ has been studied by employing magnetic and specific heat measurements, temperature and magnetic field dependent X-ray powder diffraction, and first-principles calculations. Unexpected increase of magnetization observed below the spin-reorientation temperature (T_SR) suggests that the low-temperature transition involves a reduction of Co moment. First principles calculations confirm that the paramagnetic cubic to ferrimagnetic tetragonal transformation at T_C is assisted by itinerant electron metamagnetism, and that the reduction of Co moment in HoCo₂ occurs in parallel with the ferrimagnetic tetragonal to the nearly ferromagnetic orthorhombic transformation at T_SRvia the rearrangement of both 3d states of Co and 5d states of Ho. The ac magnetic susceptibility measurements show significant magnetic frustration below T_C. Furthermore, in contrast to earlier reports neither ac nor dc magnetic susceptibilities show anomalies in the paramagnetic region obeying the Curie–Weiss law.

Authors:

Mudryk, Y. ^[1]; Paudyal, D. ^[1]; Pathak, A. K. ^[1]; Pecharsky, V. K. ^[1]; Gschneidner, Jr., K. A. ^[1]

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

Publication Date:: Wed Apr 13 00:00:00 EDT 2016

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

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

OSTI Identifier:: 1254310

Report Number(s):: IS-J-8979
Journal ID: ISSN 2050-7526; JMCCCX

Grant/Contract Number:: AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Materials Chemistry C

Additional Journal Information:: Journal Volume: 4; Journal Issue: 20; Journal ID: ISSN 2050-7526

Publisher:: Royal Society of Chemistry

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Mudryk, Y., Paudyal, D., Pathak, A. K., Pecharsky, V. K., and Gschneidner, Jr., K. A. Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo2.  United States: N. p., 2016. 
Web.  doi:10.1039/C6TC00867D.

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                    Mudryk, Y., Paudyal, D., Pathak, A. K., Pecharsky, V. K., & Gschneidner, Jr., K. A. Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo2.  United States.  https://doi.org/10.1039/C6TC00867D

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                    Mudryk, Y., Paudyal, D., Pathak, A. K., Pecharsky, V. K., and Gschneidner, Jr., K. A. Wed .  
"Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo2".  United States.  https://doi.org/10.1039/C6TC00867D.  https://www.osti.gov/servlets/purl/1254310.

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@article{osti_1254310,

  title        = {Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo2},

  author       = {Mudryk, Y. and Paudyal, D. and Pathak, A. K. and Pecharsky, V. K. and Gschneidner, Jr., K. A.},

  abstractNote = {The nature of multiple magnetostructural transformations in HoCo2 has been studied by employing magnetic and specific heat measurements, temperature and magnetic field dependent X-ray powder diffraction, and first-principles calculations. Unexpected increase of magnetization observed below the spin-reorientation temperature (TSR) suggests that the low-temperature transition involves a reduction of Co moment. First principles calculations confirm that the paramagnetic cubic to ferrimagnetic tetragonal transformation at TC is assisted by itinerant electron metamagnetism, and that the reduction of Co moment in HoCo2 occurs in parallel with the ferrimagnetic tetragonal to the nearly ferromagnetic orthorhombic transformation at TSRvia the rearrangement of both 3d states of Co and 5d states of Ho. The ac magnetic susceptibility measurements show significant magnetic frustration below TC. Furthermore, in contrast to earlier reports neither ac nor dc magnetic susceptibilities show anomalies in the paramagnetic region obeying the Curie–Weiss law.},

  doi          = {10.1039/C6TC00867D},

  journal      = {Journal of Materials Chemistry C},

  number       = 20,

  volume       = 4,

  place        = {United States},

  year         = {Wed Apr 13 00:00:00 EDT 2016},

  month        = {Wed Apr 13 00:00:00 EDT 2016}

}

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Title: Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo2

Abstract

Citation Formats

Permanent magnet materials based on the rare earth-iron-boron tetragonal compounds journal, September 1984

R 2 Fe 14 B materials: Intrinsic properties and technological aspects journal, October 1991

Giant energy product in nanostructured two-phase magnets journal, December 1993

Preparation of SmCo 5 Permanent Magnets journal, September 1969

Giant magnetostriction materials journal, November 1991

Giant Room-Temperature Magnetostrictions in Tb Fe 2 and Dy Fe 2 journal, May 1972

Magnetic Materials and Devices for the 21st Century: Stronger, Lighter, and More Energy Efficient journal, December 2010

Making the most of the magnetic and lattice entropy changes journal, November 2009

Measurements of lattice distortion in RECo2 (RE = Ho, Nd) using X-ray powder diffraction journal, December 1983

Magnetoelastic properties of RE-3d intermetallics journal, March 1990

Magnetism in rare earth—3d intermetallics journal, March 1978

Itinerant electron metamagnetism in YCo2 and LuCo2 journal, December 1990

Magnetic excitations in HoCo2 journal, January 1980

Crystal and magnetic structures of Laves phase compound NdCo2 in the temperature range between 9 and 300K journal, August 2006

Magnetic properties of single crystals of Gd Co 2 , Ho Ni 2 , and Ho Co 2 journal, November 1975

Specific heat and induced moment in HoCo2 and TbCo2 journal, November 1974

Magnetization reorientation in HoCo2 journal, January 1978

Magnetocaloric and Thermal Properties of Ho(Co1–xSix)2 Compounds journal, July 2007

Magnetism and related phenomena in RE(Co1−xSix)2 compounds journal, November 1997

Magnetic Structure of Rare‐Earth‐Cobalt (RCo 2 ) Intermetallic Compounds journal, March 1965

59Co NMR study of NdCo2, GdCo2, TbCo2 and HoCo2 journal, October 1981

X-ray magnetic circular dichroism temperature dependent study of RCo2 compounds journal, May 2000

Short-range magnetic correlations and parimagnetism in RCo2 journal, December 2013

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Pressure-dependent electrical resistivity of R Co 2 compounds ( R = rare earth) journal, February 1998

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Magnetoelastic properties of (rare-earth)Co2 compounds. I. Exchange-striction journal, February 1976

Magnetoresistance in ErCo2 and HoCo2 single crystals journal, December 1992

Magnetocaloric effect in HoCo2 compound journal, March 1991

A 3–350 K fast automatic small sample calorimeter journal, November 1997

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Magnetic properties, electronic structures and pressure effects of HoxY1−xCo2 compounds journal, January 2014

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The influence of magnetic field on the thermal properties of solids journal, August 2000

Specific Heat of Praseodymium and Neodymium Metals Between 0.4 and 4°K journal, January 1964

Specific Heat of Terbium Metal between 0.37 and 4.2°K journal, October 1962

Specific Heat of Gadolinium and Ytterbium Metals between 0.4 and 4°K journal, March 1963

Specific Heat of Holmium Metal between 0.38 and 4.2°K journal, November 1962

Anomalous Schottky Specific Heat and Structural Distortion in Ferromagnetic PrAl 2 journal, May 2013

Crystal-field-induced spin rotations in Nd Co 2 and Ho Co 2 : A Mössbauer study journal, November 1976

Crystallography, anisotropic metamagnetism, and magnetocaloric effect in Tb 5 Si 2.2 Ge 1.8 journal, January 2007

Explicit, First-Principles Tight-Binding Theory journal, December 1984

Magnetocaloric and Thermal Properties of Ho(Co1-xSix)2 Compounds. journal, September 2007

Yb 6 Ir 5 Ga 7 - A MgZn 2 Superstructure : Yb journal, December 2016

Influence of the Ge distribution on the first order magnetic transition of the MnFe(P,Ge) magnetocaloric material journal, January 2018

A case of multifunctional intermetallic compounds: negative thermal expansion coupling with magnetocaloric effect in (Gd,Ho)(Co,Fe) 2 journal, January 2019

High field induced magnetic transitions in the Y 0.7 E r 0.3 F e 2 D 4.2 deuteride journal, September 2017

Title: Balancing structural distortions via competing 4f and itinerant interactions: A case of polymorphism in magnetocaloric HoCo₂

Permanent magnet materials based on the rare earth-iron-boron tetragonal compounds
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$R_{2}$ ${Fe}_{14}$ B materials: Intrinsic properties and technological aspects
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Giant energy product in nanostructured two-phase magnets
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Preparation of SmCo ₅ Permanent Magnets
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Giant magnetostriction materials
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Giant Room-Temperature Magnetostrictions in Tb ${Fe}_{2}$ and Dy ${Fe}_{2}$
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Magnetic Materials and Devices for the 21st Century: Stronger, Lighter, and More Energy Efficient
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Making the most of the magnetic and lattice entropy changes
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Measurements of lattice distortion in RECo2 (RE = Ho, Nd) using X-ray powder diffraction
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Magnetoelastic properties of RE-3d intermetallics
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Magnetism in rare earth—3d intermetallics
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Itinerant electron metamagnetism in YCo2 and LuCo2
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Magnetic excitations in HoCo2
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Crystal and magnetic structures of Laves phase compound NdCo2 in the temperature range between 9 and 300K
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Magnetic properties of single crystals of Gd ${Co}_{2}$ , Ho ${Ni}_{2}$ , and Ho ${Co}_{2}$
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Specific heat and induced moment in HoCo2 and TbCo2
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Magnetization reorientation in HoCo2
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Magnetocaloric and Thermal Properties of Ho(Co1–xSix)2 Compounds
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Magnetism and related phenomena in RE(Co1−xSix)2 compounds
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Magnetic Structure of Rare‐Earth‐Cobalt (RCo ₂ ) Intermetallic Compounds
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59Co NMR study of NdCo2, GdCo2, TbCo2 and HoCo2
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X-ray magnetic circular dichroism temperature dependent study of RCo2 compounds
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Short-range magnetic correlations and parimagnetism in RCo2
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Observation of a different magnetic disorder in $Er {Co}_{2}$
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New magnetic configuration in paramagnetic phase of HoCo ₂
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Formation of Co Moment in the Paramagnetic Phase of RCo<sub>2</sub>
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Magnetic properties, electrical resistivity and thermal expansion of (Ho,Y)Co ₂
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Magnetism in HoCo2 and ErCo2 under high pressure
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Pressure-dependent electrical resistivity of $R {Co}_{2}$ compounds $(R$ = rare earth)
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Magnetism in rare earth Co2 compounds under high pressures
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Nature and entropy content of the ordering transitions in $R {Co}_{2}$
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Magnetoelastic properties of (rare-earth)Co2 compounds. I. Exchange-striction
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Magnetoresistance in ErCo2 and HoCo2 single crystals
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Magnetocaloric effect in HoCo2 compound
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A 3–350 K fast automatic small sample calorimeter
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X-ray powder diffractometer for in situ structural studies in magnetic fields from 0 to 35 kOe between 2.2 and 315 K
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Magnetic properties, electronic structures and pressure effects of HoxY1−xCo2 compounds
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Ordering in ferromagnets with random anisotropy
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Unusual magnetism of ${Er}_{0.75} {Dy}_{0.25} {Al}_{2}$
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Large AC field dependence of dynamic susceptibility in a weak random anisotropy magnet a-NdGdFe
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Magnetostructural transition in ${Gd}_{5} {Sb}_{0.5} {Ge}_{3.5}$
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The influence of magnetic field on the thermal properties of solids
journal, August 2000

Specific Heat of Praseodymium and Neodymium Metals Between 0.4 and 4°K
journal, January 1964

Specific Heat of Terbium Metal between 0.37 and 4.2°K
journal, October 1962

Specific Heat of Gadolinium and Ytterbium Metals between 0.4 and 4°K
journal, March 1963

Specific Heat of Holmium Metal between 0.38 and 4.2°K
journal, November 1962

Anomalous Schottky Specific Heat and Structural Distortion in Ferromagnetic ${PrAl}_{2}$
journal, May 2013

Crystal-field-induced spin rotations in Nd ${Co}_{2}$ and Ho ${Co}_{2}$ : A Mössbauer study
journal, November 1976

Crystallography, anisotropic metamagnetism, and magnetocaloric effect in ${Tb}_{5} {Si}_{2.2} {Ge}_{1.8}$
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Explicit, First-Principles Tight-Binding Theory
journal, December 1984

Magnetocaloric and Thermal Properties of Ho(Co1-xSix)2 Compounds.
journal, September 2007

Yb ₆ Ir ₅ Ga ₇ - A MgZn ₂ Superstructure : Yb
journal, December 2016

Influence of the Ge distribution on the first order magnetic transition of the MnFe(P,Ge) magnetocaloric material
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A case of multifunctional intermetallic compounds: negative thermal expansion coupling with magnetocaloric effect in (Gd,Ho)(Co,Fe) ₂
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High field induced magnetic transitions in the $Y_{0.7} E r_{0.3} F e_{2} D_{4.2}$ deuteride
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