Thermal expansion study of the spin reorientation and magnetic phase transitions in the Ho(Co1-cRhc)2 compounds

S. W. Zochowski; A. Tari

doi:10.1016/S0304-8853(96)00404-0

Thermal expansion study of the spin reorientation and magnetic phase transitions in the Ho(Co_1-cRh_c)₂ compounds

S. W. Zochowski^*
, A. Tari

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

Research output: Contribution to journal › Article › peer-review

Abstract

The cubic Laves-phase compound HoCo₂ orders magnetically at 76 K. Its moment undergoes a reorientation with increasing temperature from 〈110〉 to 〈100〉 in the temperature interval 10 to 17 K. The substitution of Rh for Co does not vary the crystal field parameters to any appreciable extent, but does alter the value of the exchange interaction, so that the series Ho(Co_1-cRh_c)₂ is particularly suitable for the investigation of the spin reorientation. The results of thermal expansion measurements on these compounds are presented and compared with theoretical investigations. It is shown that a single-ion Hamiltonian used in conjunction with suitably chosen crystal-field and exchange parameters can satisfactorily describe the spin reorientation transition. The 's-d' model is used to determine magnetic and related parameters of the series and is found to account quite well for the changing character of the magnetic phase transition.

Original language	English
Pages (from-to)	147-153
Number of pages	7
Journal	Journal of Magnetism and Magnetic Materials
Volume	164
Issue number	1-2
DOIs	https://doi.org/10.1016/S0304-8853(96)00404-0
State	Published - Nov 1996

Bibliographical note

Funding Information:
One of us, SWZ, would like to acknowledge financial support from the UK Engineering and Physical Science Research Council and the Birkbeck College Research Committee.

Keywords

's-d' model
Magnetic phase transitions
Thermal expansion

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/S0304-8853(96)00404-0

Cite this

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title = "Thermal expansion study of the spin reorientation and magnetic phase transitions in the Ho(Co1-cRhc)2 compounds",

abstract = "The cubic Laves-phase compound HoCo2 orders magnetically at 76 K. Its moment undergoes a reorientation with increasing temperature from 〈110〉 to 〈100〉 in the temperature interval 10 to 17 K. The substitution of Rh for Co does not vary the crystal field parameters to any appreciable extent, but does alter the value of the exchange interaction, so that the series Ho(Co1-cRhc)2 is particularly suitable for the investigation of the spin reorientation. The results of thermal expansion measurements on these compounds are presented and compared with theoretical investigations. It is shown that a single-ion Hamiltonian used in conjunction with suitably chosen crystal-field and exchange parameters can satisfactorily describe the spin reorientation transition. The 's-d' model is used to determine magnetic and related parameters of the series and is found to account quite well for the changing character of the magnetic phase transition.",

keywords = "'s-d' model, Magnetic phase transitions, Thermal expansion",

author = "Zochowski, \{S. W.\} and A. Tari",

note = "Funding Information: One of us, SWZ, would like to acknowledge financial support from the UK Engineering and Physical Science Research Council and the Birkbeck College Research Committee.",

year = "1996",

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doi = "10.1016/S0304-8853(96)00404-0",

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T1 - Thermal expansion study of the spin reorientation and magnetic phase transitions in the Ho(Co1-cRhc)2 compounds

AU - Zochowski, S. W.

AU - Tari, A.

N1 - Funding Information: One of us, SWZ, would like to acknowledge financial support from the UK Engineering and Physical Science Research Council and the Birkbeck College Research Committee.

PY - 1996/11

Y1 - 1996/11

N2 - The cubic Laves-phase compound HoCo2 orders magnetically at 76 K. Its moment undergoes a reorientation with increasing temperature from 〈110〉 to 〈100〉 in the temperature interval 10 to 17 K. The substitution of Rh for Co does not vary the crystal field parameters to any appreciable extent, but does alter the value of the exchange interaction, so that the series Ho(Co1-cRhc)2 is particularly suitable for the investigation of the spin reorientation. The results of thermal expansion measurements on these compounds are presented and compared with theoretical investigations. It is shown that a single-ion Hamiltonian used in conjunction with suitably chosen crystal-field and exchange parameters can satisfactorily describe the spin reorientation transition. The 's-d' model is used to determine magnetic and related parameters of the series and is found to account quite well for the changing character of the magnetic phase transition.

AB - The cubic Laves-phase compound HoCo2 orders magnetically at 76 K. Its moment undergoes a reorientation with increasing temperature from 〈110〉 to 〈100〉 in the temperature interval 10 to 17 K. The substitution of Rh for Co does not vary the crystal field parameters to any appreciable extent, but does alter the value of the exchange interaction, so that the series Ho(Co1-cRhc)2 is particularly suitable for the investigation of the spin reorientation. The results of thermal expansion measurements on these compounds are presented and compared with theoretical investigations. It is shown that a single-ion Hamiltonian used in conjunction with suitably chosen crystal-field and exchange parameters can satisfactorily describe the spin reorientation transition. The 's-d' model is used to determine magnetic and related parameters of the series and is found to account quite well for the changing character of the magnetic phase transition.

KW - 's-d' model

KW - Magnetic phase transitions

KW - Thermal expansion

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