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TT: Fachverband Tiefe Temperaturen

TT 80: Correlated Electrons: Poster

TT 80.24: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster E

Evidence for low temperature magnetic ordering in triangular YbBO₃ — •Marvin Klinger¹, Prachi Telang¹, Tim Treu¹, Anna Moser¹, Ramesh Nath², Surya Mohanty², Gediminas Simutis³, Anton Jesche¹, and Philipp Gegenwart¹ — ¹EP VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg — ²School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram — ³Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut

The triangular magnet YbBO₃ attracted considerable attention as a quantum spin liquid candidate material with absent magnetic long-range order as well as spin freezing down to 20 mK in muon spin rotation (µSR) experiments [1]. In the course of investigating the suitability of this material for millikelvin adiabatic demagnetization refrigeration, we prepared a phase pure YbBO₃ powder, mixed it with fine silver powder for optimizing thermal contact and pressed pellets for standardized ADR performance test in the PPMS, similar as in [2]. The heat capacity, determined from the warming curve, indicates a clear and sharp magnetic phase transition at 400 mK, also confirmed by µSR on the same pellet. This indicates that silver is required to bind the grains together for thermal contact, otherwise the sample temperature could be significantly increased leading to wrong conclusions.

Work supported by the German Research Foundation through project 514162746 (GE 1640/11-1).

[1] K. Somesh et al., Phys. Rev. B 107, 064421 (2023).

[2] A. Jesche et al., Phys. Rev. B 107, 104402 (2023).

Keywords: Magnetic order; Adiabatic demagnetization refrigeration; sub-Kelvin