Stabilizing even-parity chiral superconductivity in Sr2RuO4

Autor(es)

Suh, Han Gyeol ^[1] ; Menke, Henri ^{[2, 3]} ; Brydon, P. M. R. ^{[2, 3]} ; Timm, Carsten ^{[4, 5]} ; Ramires, Aline ^{[6, 7, 8, 9]} ; Agterberg, Daniel F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Wisconsin, Dept Phys, Milwaukee, WI 53201 - USA

^[2] Univ Otago, Dept Phys, POB 56, Dunedin 9054 - New Zealand

^[3] Univ Otago, MacDiarmid Inst Adv Mat & Nanotechnol, POB 56, Dunedin 9054 - New Zealand

^[4] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden - Germany

^[5] Tech Univ Dresden, Wurzburg Dresden Cluster Excellence Ctqmat, D-01062 Dresden - Germany

^[6] Paul Scherrer Inst, CH-5232 Villigen - Switzerland

^[7] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden - Germany

^[8] Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo, SP - Brazil

^[9] South Amer Inst Fundamental Res, ICTP SAIFR, Int Ctr Theoret Phys, BR-01140070 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW RESEARCH; v. 2, n. 3 JUL 21 2020.
• Citações Web of Science: 23

Resumo

Strontium ruthenate (Sr2RuO4) has long been thought to host a spin-triplet chiral p-wave superconducting state. However, the singletlike response observed in recent spin-susceptibility measurements casts serious doubts on this pairing state. Together with the evidence for broken time-reversal symmetry and a jump in the shear modulus c(66) at the superconducting transition temperature, the available experiments point towards an even-parity chiral superconductor with k(z)(k(x) +/- ik(y))-like E-g symmetry, which has consistently been dismissed based on the quasi-two-dimensional electronic structure of Sr2RuO4. Here, we show how the orbital degree of freedom can encode the two-component nature of the E-g order parameter, allowing for a local orbital-antisymmetric spin-triplet state that can be stabilized by on-site Hund's coupling. We find that this exotic E-g state can be energetically stable once a complete, realistic three-dimensional model is considered, within which momentum-dependent spin-orbit coupling terms are key. This state naturally gives rise to Bogoliubov Fermi surfaces. (AU)

• Processo FAPESP: 18/18287-8 - Novos métodos teóricos para o entendimento e optimização de fases emergentes da matéria em materiais complexos
• Beneficiário: Aline Ramires Neves de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores