Multiple magnetic interactions and large inverse magnetocaloric effect in TbSi and TbSi0.6 Ge0.4

Kumar, Ajay; Singh, Prashant; Doyle, Andrew; Schlagel, Deborah L.; Mudryk, Yaroslav

doi:10.1103/physrevb.109.214410

Title: Multiple magnetic interactions and large inverse magnetocaloric effect in TbSi and TbSi_0.6 Ge_0.4

Journal Article · Thu Jun 06 00:00:00 UTC 2024 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.109.214410 · OSTI ID:2376177

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^[1]; Doyle, Andrew ^[1];

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Ames Laboratory, and Iowa State University, Ames, IA (United States)

We present a comprehensive investigation of the electronic structure, magnetization, specific heat, and crystallography of TbSi (FeB structure type) and TbSi_0.6⁢Ge_0.4 (CrB structure type) compounds. Both TbSi and TbSi_0.6⁢Ge_0.4 exhibit two antiferromagnetic (AFM) transitions at T_N⁢1≈ 58 and 57 K, and T_N⁢2≈ 36 and 44 K, respectively, along with an onset of weak metamagneticlike transition around 6 T between T_N⁢1 and T_N⁢2. High-resolution specific heat (C_P) measurements show the second- and first-order nature of the magnetic transition at T_N⁢1 and T_N⁢2, respectively, for both samples. However, in the case of TbSi, the low-temperature (LT) AFM to high-temperature (HT) AFM transition takes place via an additional AFM phase at the intermediate temperature (IT), where both LT to IT AFM and IT to HT AFM phase transitions exhibit a first-order nature. Both TbSi and TbSi_0.6⁢Ge_0.4 manifest significant magnetic entropy changes (Δ⁢S_M) of 9.6 and 11.6 J/kg-K, respectively, for Δ⁢μ₀⁢H=7 T, at T_N⁢2. The HT AFM phase of TbSi_0.6⁢Ge_0.4 is found to be more susceptible to the external magnetic field, causing a significant broadening in the peaks of Δ⁢S_M curves at higher magnetic fields. Temperature- and field-dependent specific-heat data have been utilized to construct the complex HT phase diagram of these compounds. As a result, temperature-dependent x-ray diffraction measurements demonstrate substantial magnetostriction and anisotropic thermal expansion of the unit cell in both samples.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2376177

Report Number(s):: IS-J--11,366

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 21 Vol. 109; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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