Magnetism of Ho1-xTbxAl₂ alloys: Critical dependence of a first-order transition on Tb concentration

Khan, Mahmud; Mudryk, Ya.; Gschneidner, K. A.; Pecharsky, V. K.

doi:10.1103/PhysRevB.84.214437

Title: Magnetism of Ho_1-xTb_xAl₂ alloys: Critical dependence of a first-order transition on Tb concentration

Abstract

HoAl₂ exhibits a first-order spin reorientation transition at 20 K, which is manifested as a sharp peak in the heat capacity. When Ho is partially replaced by only 5% of Tb, the sharp heat-capacity peak in Ho_1-xTb_xAl₂ (x = 0.05) disappears, and then reappears again for x ≥ 0.07. For x = 0.05, the anomaly corresponding to the spin reorientation transition is barely seen in the heat capacity, but as x exceeds 0.07 the weak anomaly transforms to a sharp peak. The spin reorientation transition temperature increases to 29 K for x = 0.05, and as x increases further the transition shifts to lower temperature and returns to ~20 K for x = 0.25. The transition is no longer observed when x exceeds 0.60. Temperature-dependent x-ray powder-diffraction data confirm the first-order nature of the spin reorientation transition for the alloy with x = 0.40, and indicate that the compound retains the room-temperature cubic structure within the sensitivity of the technique. Experimental observations are discussed considering the easy magnetization directions of HoAl₂ and TbAl₂.

Authors:: Khan, Mahmud; Mudryk, Ya.; Gschneidner, K. A.; Pecharsky, V. K.

Publication Date:: Tue Dec 27 00:00:00 EST 2011

Sponsoring Org.:: USDOE

OSTI Identifier:: 1098492

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 84 Journal Issue: 21; Journal ID: ISSN 1098-0121

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Citation Formats


                    Khan, Mahmud, Mudryk, Ya., Gschneidner, K. A., and Pecharsky, V. K. Magnetism of Ho1-xTbxAl₂ alloys: Critical dependence of a first-order transition on Tb concentration.  United States: N. p., 2011. 
Web.  doi:10.1103/PhysRevB.84.214437.

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                    Khan, Mahmud, Mudryk, Ya., Gschneidner, K. A., & Pecharsky, V. K. Magnetism of Ho1-xTbxAl₂ alloys: Critical dependence of a first-order transition on Tb concentration.  United States.  https://doi.org/10.1103/PhysRevB.84.214437

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                    Khan, Mahmud, Mudryk, Ya., Gschneidner, K. A., and Pecharsky, V. K. Tue .  
"Magnetism of Ho1-xTbxAl₂ alloys: Critical dependence of a first-order transition on Tb concentration".  United States.  https://doi.org/10.1103/PhysRevB.84.214437.

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@article{osti_1098492,

  title        = {Magnetism of Ho1-xTbxAl₂ alloys: Critical dependence of a first-order transition on Tb concentration},

  author       = {Khan, Mahmud and Mudryk, Ya. and Gschneidner, K. A. and Pecharsky, V. K.},

  abstractNote = {HoAl₂ exhibits a first-order spin reorientation transition at 20 K, which is manifested as a sharp peak in the heat capacity. When Ho is partially replaced by only 5% of Tb, the sharp heat-capacity peak in Ho1-xTbxAl₂ (x = 0.05) disappears, and then reappears again for x ≥ 0.07. For x = 0.05, the anomaly corresponding to the spin reorientation transition is barely seen in the heat capacity, but as x exceeds 0.07 the weak anomaly transforms to a sharp peak. The spin reorientation transition temperature increases to 29 K for x = 0.05, and as x increases further the transition shifts to lower temperature and returns to ~20 K for x = 0.25. The transition is no longer observed when x exceeds 0.60. Temperature-dependent x-ray powder-diffraction data confirm the first-order nature of the spin reorientation transition for the alloy with x = 0.40, and indicate that the compound retains the room-temperature cubic structure within the sensitivity of the technique. Experimental observations are discussed considering the easy magnetization directions of HoAl₂ and TbAl₂.},

  doi          = {10.1103/PhysRevB.84.214437},

  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  number       = 21,

  volume       = 84,

  place        = {United States},

  year         = {Tue Dec 27 00:00:00 EST 2011},

  month        = {Tue Dec 27 00:00:00 EST 2011}

}

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Works referenced in this record:

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Title: Magnetism of Ho1-xTbxAl₂ alloys: Critical dependence of a first-order transition on Tb concentration

Abstract

Citation Formats

Matrix Elements and Operator Equivalents Connected with the Magnetic Properties of Rare Earth Ions journal, March 1952

Crystal field effects on the magnetocrystalline anisotropy in HoAl2 journal, July 1976

Disappearance and reappearance of magnetic ordering upon lanthanide substitution in ( Er 1 − x Dy x ) Al 2 journal, October 2003

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

Multiple magnetic ordering phenomena evaluated by heat capacity measurements in Er 1 − x Tb x Al 2 Laves-phase alloys journal, December 2009

Experimental and theoretical study of the magnetic and structural properties of Er 0.75 Tb 0.25 Al 2 journal, August 2010

Effect of magnetocrystalline anisotropy on the low temperature heat capacity of HoAl 2 journal, March 1978

Elastic neutron diffraction study of TbAl2 and HoAl2 journal, September 1972

Crystal structure-magnetic property relationships of Gd 5 Ge 4 examined by in situ x-ray powder diffraction journal, August 2005

Specific Heat in TbZn and HoZn Compounds journal, August 1974

Magnetization and magnetic excitations in HoAl2 journal, March 1983

Magnetic phase transitions, magnetocrystalline anisotropy, and crystal-field interactions in the R Fe 11 Ti series (where R =Y, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, or Tm) journal, February 1993

Unusual magnetism of Er 0.75 Dy 0.25 Al 2 journal, July 2007

Low temperature heat capacities and related thermal properties of TbAl2 and HoAl2 journal, December 1973

X-ray powder diffractometer for in situ structural studies in magnetic fields from 0 to 35 kOe between 2.2 and 315 K journal, April 2004

Crystal field and exchange in the cubic HoAl2 compound journal, January 1977

Magnetic behavior of HoAl2 single crystal journal, December 1975

Use of Stevens coefficients for the prediction of magnetic transitions in pseudobinary R 1 − x R x ' Al 2 alloys: Application to Tm 1 − x Tb x Al 2 journal, April 2011

Spin reorientations in single crystal HoAl 2 journal, March 1979

Magnetic anisotropy and spin-reorientation in HoAl2 journal, January 1985

Title: Magnetism of Ho_1-xTb_xAl₂ alloys: Critical dependence of a first-order transition on Tb concentration

Matrix Elements and Operator Equivalents Connected with the Magnetic Properties of Rare Earth Ions
journal, March 1952

Crystal field effects on the magnetocrystalline anisotropy in HoAl2
journal, July 1976

Disappearance and reappearance of magnetic ordering upon lanthanide substitution in $({Er}_{1 - x} {Dy}_{x}) {Al}_{2}$
journal, October 2003

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

Multiple magnetic ordering phenomena evaluated by heat capacity measurements in ${Er}_{1 - x} {Tb}_{x} {Al}_{2}$ Laves-phase alloys
journal, December 2009

Experimental and theoretical study of the magnetic and structural properties of ${Er}_{0.75} {Tb}_{0.25} {Al}_{2}$
journal, August 2010

Effect of magnetocrystalline anisotropy on the low temperature heat capacity of HoAl ₂
journal, March 1978

Elastic neutron diffraction study of TbAl2 and HoAl2
journal, September 1972

Crystal structure-magnetic property relationships of ${Gd}_{5} {Ge}_{4}$ examined by in situ x-ray powder diffraction
journal, August 2005

Specific Heat in TbZn and HoZn Compounds
journal, August 1974

Magnetization and magnetic excitations in HoAl2
journal, March 1983

Magnetic phase transitions, magnetocrystalline anisotropy, and crystal-field interactions in the R ${Fe}_{11}$ Ti series (where R =Y, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, or Tm)
journal, February 1993

Unusual magnetism of ${Er}_{0.75} {Dy}_{0.25} {Al}_{2}$
journal, July 2007

Low temperature heat capacities and related thermal properties of TbAl2 and HoAl2
journal, December 1973

X-ray powder diffractometer for in situ structural studies in magnetic fields from 0 to 35 kOe between 2.2 and 315 K
journal, April 2004

Crystal field and exchange in the cubic HoAl2 compound
journal, January 1977

Magnetic behavior of HoAl2 single crystal
journal, December 1975

Use of Stevens coefficients for the prediction of magnetic transitions in pseudobinary $R_{1 - x} R_{x}^{'}$ Al $_{2}$ alloys: Application to Tm $_{1 - x}$ Tb $_{x}$ Al $_{2}$
journal, April 2011

Spin reorientations in single crystal HoAl ₂
journal, March 1979

Magnetic anisotropy and spin-reorientation in HoAl2
journal, January 1985