Theory of strain-induced magnetic order and splitting of Tc and TTRSB in Sr2RuO4
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Theory of strain-induced magnetic order and splitting of Tc and TTRSB in Sr2RuO4. / Romer, Astrid T.; Kreisel, Andreas; Mueller, Marvin A.; Hirschfeld, P. J.; Eremin, Ilya M.; Andersen, Brian M.
I: Physical Review B, Bind 102, Nr. 5, 054506, 07.08.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Theory of strain-induced magnetic order and splitting of Tc and TTRSB in Sr2RuO4
AU - Romer, Astrid T.
AU - Kreisel, Andreas
AU - Mueller, Marvin A.
AU - Hirschfeld, P. J.
AU - Eremin, Ilya M.
AU - Andersen, Brian M.
PY - 2020/8/7
Y1 - 2020/8/7
N2 - The internal structure of the superconducting state in Sr2RuO4 remains elusive at present, and exhibits evidence for time-reversal symmetry breaking. Recent muon spin relaxation measurements under uniaxial strain have revealed an increasing splitting between the superconducting critical temperature T-c and the onset of time-reversal symmetry breaking TTRSB with applied strain (Grinenko et al., arXiv:2001.08152). In addition, static magnetic order is induced by the uniaxial strain beyond similar to 1 GPa, indicating that unstained Sr2RuO4 is close to a magnetic quantum critical point. Here we perform a theoretical study of the magnetic susceptibility and the associated pairing structure as a function of uniaxial strain. It is found that the recent muon relaxation data can be qualitatively explained from the perspective of spin-fluctuation mediated pairing and the associated strain dependence of accidentally degenerate pair states in unstrained Sr2RuO4. In addition, while unstrained Sr2RuO4 features mainly (27 pi/3, 27 pi /3) magnetic fluctuations, uniaxial strain promotes (pi, +/-pi/2) magnetic order.
AB - The internal structure of the superconducting state in Sr2RuO4 remains elusive at present, and exhibits evidence for time-reversal symmetry breaking. Recent muon spin relaxation measurements under uniaxial strain have revealed an increasing splitting between the superconducting critical temperature T-c and the onset of time-reversal symmetry breaking TTRSB with applied strain (Grinenko et al., arXiv:2001.08152). In addition, static magnetic order is induced by the uniaxial strain beyond similar to 1 GPa, indicating that unstained Sr2RuO4 is close to a magnetic quantum critical point. Here we perform a theoretical study of the magnetic susceptibility and the associated pairing structure as a function of uniaxial strain. It is found that the recent muon relaxation data can be qualitatively explained from the perspective of spin-fluctuation mediated pairing and the associated strain dependence of accidentally degenerate pair states in unstrained Sr2RuO4. In addition, while unstrained Sr2RuO4 features mainly (27 pi/3, 27 pi /3) magnetic fluctuations, uniaxial strain promotes (pi, +/-pi/2) magnetic order.
KW - SUPERCONDUCTIVITY
U2 - 10.1103/PhysRevB.102.054506
DO - 10.1103/PhysRevB.102.054506
M3 - Journal article
VL - 102
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 5
M1 - 054506
ER -
ID: 247333445