Theory of strain-induced magnetic order and splitting of 
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 and 
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 in 
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Rømer, Astrid T.; Kreisel, Andreas; Müller, Marvin A.; Hirschfeld, P. J.; Eremin, I.; Andersen, Brian M.

doi:10.1103/physrevb.102.054506

Cited by 38 publications

(32 citation statements)

References 62 publications

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“…Stress is generically expected to affect the two components of either order parameter differently; therefore, if they are tuned to T TRSB ≈ T c at σ = 0, splitting is in general expected when σ ≠ 0 (refs. 56,57 ). Furthermore, because the proposed degeneracy of these order parameters is tuned rather than symmetry protected, there are no thermodynamic constraints on the relative stress dependences of T TRSB and T c .…”

Section: Strontium Ruthenate (Sr 2 Ruo 4 ) Continues To Present An Immentioning

confidence: 99%

Split superconducting and time-reversal symmetry-breaking transitions in Sr2RuO4 under stress

et al. 2021

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or most of its history, the superconductivity of strontium ruthenate (Sr 2 RuO 4) (ref. 1) has been understood in terms of an odd-parity two-component order parameter with equal-spin pairing in the RuO 2 planes: p x ± ip y (refs. 2-5). This order parameter is chiral: the Cooper pairs have angular momentum l = ±1. The evidence for chirality comes from the zero-field muon spin relaxation (ZF-μSR) data 6 , observation of a non-zero Kerr rotation below the critical temperature T c (ref. 7) and signs in the junction experiments of domains in the superconducting state 8,9 , while evidence for equal-spin pairing came from the absence of a change in the Knight shift below T c in nuclear magnetic resonance 10 and polarized neutron scattering 11 measurements. The Knight shift is related to the spin susceptibility; in conventional opposite-spin-pairing superconductors, it is suppressed below T c. However, in new measurements, it has been found that the Knight shift is, in fact, suppressed below T c (refs. 12-14), by a magnitude that is unlikely to be reconcilable with equal-spin pairing. This revision has called into question a number of other results on Sr 2 RuO 4. It raises a particular challenge for experiments that indicate chirality, because opposite-spin pairing implies an even-parity momentum-space gap structure. If the order parameter is constrained to be even parity, chiral, and composed of components that are degenerate on the tetragonal lattice of Sr 2 RuO 4 , the only possibility is d xz ± id yz order 15. Under conventional understanding, this is a highly unlikely order parameter because it

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Section: Strontium Ruthenate (Sr 2 Ruo 4 ) Continues To Present An Immentioning

confidence: 99%

Split superconducting and time-reversal symmetry-breaking transitions in Sr2RuO4 under stress

et al. 2021

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“…For the previously assumed superconducting state, detailed theoretical analyses of the magnetic response were reported [51], but concerning the more recently proposed superconducting symmetries [19][20][21][22][23][24][25][26], such investigations are lacking. The d x 2 −y 2 state deduced from quasiparticle interference imaging [26] exhibits nodes at Fermi-surface positions that are connected through the nesting vector.…”

Section: B Search For a Gap Opening Or A Resonance Mode Below T Cmentioning

confidence: 99%

“…The new studies of the Knight shift in NMR [16,17] and those of the polarized neutron diffraction [18] reveal an unambiguous drop of the electronic susceptibility that is inconsistent with spin-triplet pairs parallel to Ru layers. Since then, numerous proposals for the superconducting state were made mostly invoking some d-wave state, and the discussion of the superconducting pairing has become very active [19][20][21][22][23][24][25][26]. The observations of broken time-reversal symmetry in muon spin relaxation experiments [27,28] and in measurements of the magnetooptical Kerr effect [29] may require interpretations other than the chiral p-wave scenario.…”

Section: Introductionmentioning

confidence: 99%

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Neutron scattering studies on spin fluctuations in Sr2RuO4

et al. 2021

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“…A peak in the accumulated evidence was reached when the NMR Knight shift experiment was repeated [14,15], now finding a substantial reduction in the spin susceptibility at low temperature. This has launched a renewed focus on the compound, both experimentally [16][17][18][19][20][21] and theoretically [22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Microscopic Ginzburg-Landau theory and singlet ordering inSr2RuO4

et al. 2021

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The long-standing quest to determine the superconducting order of Sr 2 RuO 4 (SRO) has received renewed attention after recent nuclear magnetic resonance (NMR) Knight shift experiments have cast doubt on the possibility of spin-triplet pairing in the superconducting state. As a putative solution, encompassing a body of experiments conducted over the years, a (d + ig)-wave order parameter caused by an accidental near degeneracy has been suggested [S. A. Kivelson et al., npj Quantum Mater. 5, 43 (2020)]. Here we develop a general Ginzburg-Landau theory for multiband superconductors. We apply the theory to SRO and predict the relative size of the order parameter components. The heat capacity jump expected at the onset of the second-order parameter component is found to be above the current threshold deduced by the experimental absence of a second jump. Our results tightly restrict theories of d + ig order, and other candidates caused by a near degeneracy, in SRO. We discuss possible solutions to the problem.

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Theory of strain-induced magnetic order and splitting of Tc and TTRSB in Sr2RuO

Cited by 38 publications

References 62 publications

Split superconducting and time-reversal symmetry-breaking transitions in Sr2RuO4 under stress

Split superconducting and time-reversal symmetry-breaking transitions in Sr2RuO4 under stress

Neutron scattering studies on spin fluctuations in Sr2RuO4

Microscopic Ginzburg-Landau theory and singlet ordering inSr2RuO4

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