Advanced Condensed Matter Physics
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Abstract
Abstract
Abstract Owing to the limited availability and high cost of 3He, adiabatic demagnetization refrigeration (ADR) has gained considerable attention as an efficient technology for ultralow-temperature applications. Here, we demonstrate the frustrated garnet Gd3Te2Li3O12 (GTLG) as a high-performance ADR material with substantially improved cooling capability over the commercial benchmark Gd3Ga5O12 (GGG). Direct ADR measurements reveal a minimum temperature of 165 mK for GTLG, nearly two-fold lower than that of GGG (320 mK). Under a cryostat bath temperature of 1.8 K, GTLG maintains temperatures below 1 K for more than 12 h and below the 3He-temperature (0.4 K) for over 3 h, demonstrating excellent temperature stability for prolonged cryogenic operation. Magnetic and thermodynamic measurements show that GTLG undergoes antiferromagnetic ordering at TN ∼ 0.25 K while retaining strong magnetic frustration and a large magnetic entropy reservoir favorable for efficient demagnetization cooling. Field-dependent heat capacity and magnetic Grüneisen parameter measurements further reveal the presence of field-induced critical behavior that enables cooling below TN through enhanced entropy accumulation near the critical region. These findings establish GTLG as a promising next-generation magnetic refrigerant and highlight field-induced criticality as an effective design principle for developing advanced materials for ultralow-temperature refrigeration.
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@article{Ranaut2026Frustrated,
title = {Frustrated Garnet Gd3Te2Li3O12 for High-Performance Sub-Kelvin Adiabatic Demagnetization Refrigeration},
author = {Dheeraj Ranaut and Govind Unnikrishnan and Samraj M and Sharath Kumar Channarayappa and Prashanta K. Mukharjee and Parasuraman Saravanan and Philipp Gegenwart and D. Jaiswal‐Nagar},
journal = {ACS Applied Electronic Materials},
year = {2026},
doi = {10.1021/acsaelm.6c01619},
url = {https://doi.org/10.1021/acsaelm.6c01619}
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