Electronuclear Transition into a Spatially Modulated Magnetic State in YbRh_{2}Si_{2}

The nature of the antiferromagnetic order in the heavy fermion metal YbRh_{2}Si_{2}, its quantum criticality, and superconductivity, which appears at low mK temperatures, remain open questions. We report measurements of the heat capacity over the wide temperature range 180  μK-80  mK, using current...

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Bibliographic Details
Published in:Physical review letters 2023-03, Vol.130 (12), p.126802-126802
Main Authors: Knapp, J, Levitin, L V, Nyéki, J, Ho, A F, Cowan, B, Saunders, J, Brando, M, Geibel, C, Kliemt, K, Krellner, C
Format: Article
Language:English
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Summary:The nature of the antiferromagnetic order in the heavy fermion metal YbRh_{2}Si_{2}, its quantum criticality, and superconductivity, which appears at low mK temperatures, remain open questions. We report measurements of the heat capacity over the wide temperature range 180  μK-80  mK, using current sensing noise thermometry. In zero magnetic field we observe a remarkably sharp heat capacity anomaly at 1.5 mK, which we identify as an electronuclear transition into a state with spatially modulated electronic magnetic order of maximum amplitude 0.1  μ_{B}. We also report results of measurements in magnetic fields in the range 0 to 70 mT, applied perpendicular to the c axis, which show eventual suppression of this order. These results demonstrate a coexistence of a large moment antiferromagnet with putative superconductivity.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.130.126802