Lambda (λ) Transition in the Heat Capacity by Finite Block Spin Phenomenology

Kwang Sei Lee; Je Huan Koo; Cheol Eui Lee

doi:10.3938/jkps.74.1085

Lambda (λ) Transition in the Heat Capacity by Finite Block Spin Phenomenology

Kwang Sei Lee, Je Huan Koo, Cheol Eui Lee

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

Abstract

We explain the lambda (λ) transition in the heat capacity in terms of spin freezing on the basis of finite-sized block spin concepts. Thus, the spin-glass phase or the antiferromagnetic/paramagnetic phase near the Néel temperature may be considered as a short-range ordering of the block spins comprised of many random spins with respective majority spin directions. Using the Curie law for the block spins, we obtain the λ-type heat capacity in the lower and the higher temperature approximations of the Brillouin function. The theoretical heat capacity gives a good fit to the experimental data.

Original language	English
Pages (from-to)	1085-1088
Number of pages	4
Journal	Journal of the Korean Physical Society
Volume	74
Issue number	11
DOIs	https://doi.org/10.3938/jkps.74.1085
Publication status	Published - 2019 Jun 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (Project Nos. 2016R1D1A1A0991 7003 and 2019R1A2C1002076).

Publisher Copyright:
© 2019, The Korean Physical Society.

Keywords

Antiferromagnetic phase transition
Heat capacity
Lambda (λ) transition
N´eel temperature

ASJC Scopus subject areas

General Physics and Astronomy

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10.3938/jkps.74.1085

Cite this

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title = "Lambda (λ) Transition in the Heat Capacity by Finite Block Spin Phenomenology",

abstract = "We explain the lambda (λ) transition in the heat capacity in terms of spin freezing on the basis of finite-sized block spin concepts. Thus, the spin-glass phase or the antiferromagnetic/paramagnetic phase near the N{\'e}el temperature may be considered as a short-range ordering of the block spins comprised of many random spins with respective majority spin directions. Using the Curie law for the block spins, we obtain the λ-type heat capacity in the lower and the higher temperature approximations of the Brillouin function. The theoretical heat capacity gives a good fit to the experimental data.",

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N2 - We explain the lambda (λ) transition in the heat capacity in terms of spin freezing on the basis of finite-sized block spin concepts. Thus, the spin-glass phase or the antiferromagnetic/paramagnetic phase near the Néel temperature may be considered as a short-range ordering of the block spins comprised of many random spins with respective majority spin directions. Using the Curie law for the block spins, we obtain the λ-type heat capacity in the lower and the higher temperature approximations of the Brillouin function. The theoretical heat capacity gives a good fit to the experimental data.

AB - We explain the lambda (λ) transition in the heat capacity in terms of spin freezing on the basis of finite-sized block spin concepts. Thus, the spin-glass phase or the antiferromagnetic/paramagnetic phase near the Néel temperature may be considered as a short-range ordering of the block spins comprised of many random spins with respective majority spin directions. Using the Curie law for the block spins, we obtain the λ-type heat capacity in the lower and the higher temperature approximations of the Brillouin function. The theoretical heat capacity gives a good fit to the experimental data.

KW - Antiferromagnetic phase transition

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KW - N´eel temperature

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Lambda (λ) Transition in the Heat Capacity by Finite Block Spin Phenomenology

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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