Evidence for a pressure-induced antiferromagnetic quantum critical point in intermediate-valence UTe2
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Evidence for a pressure-induced antiferromagnetic quantum critical point in intermediate-valence UTe2. / Thomas, S. M.; Santos, F. B.; Christensen, M. H.; Asaba, T.; Ronning, F.; Thompson, J. D.; Bauer, E. D.; Fernandes, R. M.; Fabbris, G.; Rosa, P. F.S.
I: Science Advances, Bind 6, Nr. 42, eabc8709, 10.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Evidence for a pressure-induced antiferromagnetic quantum critical point in intermediate-valence UTe2
AU - Thomas, S. M.
AU - Santos, F. B.
AU - Christensen, M. H.
AU - Asaba, T.
AU - Ronning, F.
AU - Thompson, J. D.
AU - Bauer, E. D.
AU - Fernandes, R. M.
AU - Fabbris, G.
AU - Rosa, P. F.S.
N1 - Publisher Copyright: Copyright © 2020 The Authors, some rights reserved;
PY - 2020/10
Y1 - 2020/10
N2 - UTe2 is a recently discovered unconventional superconductor that has attracted much interest because of its potentially spin-triplet topological superconductivity. Our ac calorimetry, electrical resistivity, and x-ray absorption study of UTe2 under applied pressure reveals key insights on the superconducting and magnetic states surrounding pressure-induced quantum criticality at Pc1 = 1.3 GPa. First, our specific heat data at low pressures, combined with a phenomenological model, show that pressure alters the balance between two closely competing superconducting orders. Second, near 1.5 GPa, we detect two bulk transitions that trigger changes in the resistivity, which are consistent with antiferromagnetic order, rather than ferromagnetism. Third, the emergence of magnetism is accompanied by an increase in valence toward a U4+ (5f2) state, which indicates that UTe2 exhibits intermediate valence at ambient pressure. Our results suggest that antiferromagnetic fluctuations may play a more substantial role on the superconducting state of UTe2 than previously thought.
AB - UTe2 is a recently discovered unconventional superconductor that has attracted much interest because of its potentially spin-triplet topological superconductivity. Our ac calorimetry, electrical resistivity, and x-ray absorption study of UTe2 under applied pressure reveals key insights on the superconducting and magnetic states surrounding pressure-induced quantum criticality at Pc1 = 1.3 GPa. First, our specific heat data at low pressures, combined with a phenomenological model, show that pressure alters the balance between two closely competing superconducting orders. Second, near 1.5 GPa, we detect two bulk transitions that trigger changes in the resistivity, which are consistent with antiferromagnetic order, rather than ferromagnetism. Third, the emergence of magnetism is accompanied by an increase in valence toward a U4+ (5f2) state, which indicates that UTe2 exhibits intermediate valence at ambient pressure. Our results suggest that antiferromagnetic fluctuations may play a more substantial role on the superconducting state of UTe2 than previously thought.
UR - http://www.scopus.com/inward/record.url?scp=85093489267&partnerID=8YFLogxK
U2 - 10.1126/sciadv.abc8709
DO - 10.1126/sciadv.abc8709
M3 - Journal article
C2 - 33055167
AN - SCOPUS:85093489267
VL - 6
JO - Science advances
JF - Science advances
SN - 2375-2548
IS - 42
M1 - eabc8709
ER -
ID: 398068222