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 journalArticlepeer-review


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 languageEnglish
Pages (from-to)1085-1088
Number of pages4
JournalJournal of the Korean Physical Society
Issue number11
Publication statusPublished - 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.


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

ASJC Scopus subject areas

  • General Physics and Astronomy


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