Controlling crystal-electric field levels through symmetry-breaking uniaxial pressure in a cubic super heavy fermion

Gati, Elena; Schmidt, Burkhard; Bud’ko, Sergey L.; Mackenzie, Andrew P.; Canfield, Paul C.

doi:10.1038/s41535-023-00596-1

Title: Controlling crystal-electric field levels through symmetry-breaking uniaxial pressure in a cubic super heavy fermion

Journal Article · Mon Nov 20 00:00:00 EST 2023 · npj Quantum Materials

DOI:https://doi.org/10.1038/s41535-023-00596-1· OSTI ID:2217247

; Schmidt, Burkhard;

; Mackenzie, Andrew P.; Canfield, Paul C.

Abstract YbPtBi is one of the heavy-fermion systems with largest Sommerfeld coefficient γ and is thus classified as a ‘super’-heavy fermion material. In this work, we resolve the long-debated question about the hierarchy of relevant energy scales, such as crystal-electric field (CEF) levels, Kondo and magnetic ordering temperature, in YbPtBi. Through measurements of the a.c. elastocaloric effect and generic symmetry arguments, we identify an elastic level splitting that is unambiguously associated with the symmetry-allowed splitting of a quartet CEF level. This quartet, which we identify to be the first excited state at Δ/ k _B ≈ 1.6 K above the doublet ground state at ambient pressure, is well below the proposed Kondo temperature T _K ≈ 10 K. Consequently, this analysis of the energy scheme can provide support models that predict that the heavy electron mass is a result of an enhanced degeneracy of the CEF ground state, i.e., a quasi-sextet in YbPtBi. At the same time, our study shows the potential of the a.c. elastocaloric effect to control and quantify strain-induced changes of the CEF schemes, opening a different route to disentangle the CEF energy scales from other relevant energy scales in correlated quantum materials.

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

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

Grant/Contract Number:: DEAC02-07CH11358; AC02-07CH11358

OSTI ID:: 2217247

Alternate ID(s):: OSTI ID: 2217317

Report Number(s):: IS-J-11,200; 69; PII: 596

Journal Information:: npj Quantum Materials, Journal Name: npj Quantum Materials Vol. 8 Journal Issue: 1; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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