Chiral d-wave superconductivity in SrPtAs

被引：151

作者：

Fischer, Mark H. ^{[1
,2
]}

Neupert, Titus ^{[3
,4
]}

Platt, Christian ^{[5
]}

Schnyder, Andreas P. ^{[6
]}

Hanke, Werner ^{[5
]}

Goryo, Jun ^{[7
]}

Thomale, Ronny ^{[5
]}

Sigrist, Manfred ^{[4
]}

机构：

[1] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-76100 Rehovot, Israel

[2] Cornell Univ, Dept Phys, Ithaca, NY 14853 USA

[3] Princeton Univ, Princeton Ctr Theoret Sci, Princeton, NJ 08544 USA

[4] ETH, Inst Theoret Phys, CH-8093 Zurich, Switzerland

[5] Univ Wurzburg, Inst Theoret Phys, D-97074 Wurzburg, Germany

[6] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[7] Hirosaki Univ, Dept Adv Phys, Hirosaki, Aomori 0368561, Japan

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 02期

基金：

欧洲研究理事会; 美国国家科学基金会; 瑞士国家科学基金会;

关键词：

FUNCTIONAL RENORMALIZATION-GROUP;

D O I：

10.1103/PhysRevB.89.020509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Recent muon spin-rotation (mu SR) measurements on SrPtAs revealed time-reversal-symmetry breaking with the onset of superconductivity [Biswas et al., Phys. Rev. B 87, 180503(R) (2013)], suggesting an unconventional superconducting state. We investigate this possibility via the functional renormalization group and find a chiral (d + id)-wave order parameter favored by the multiband fermiology and hexagonal symmetry of SrPtAs. This (d + id)-wave state exhibits significant gap anisotropies as well as gap differences on the different bands, but only has point nodes on one of the bands at the Brillouin zone corners. We study the topological characteristics of this superconducting phase, which features Majorana-Weyl nodes in the bulk, protected surface states, and an associated thermal Hall response. The lack of extended nodes and the spontaneously broken time-reversal symmetry of the (d + id)-wave state are in agreement with the mu SR experiments. Our theoretical findings, together with the experimental evidence, thus suggest that SrPtAs is an example of chiral d-wave pairing and a Weyl superconductor.

引用

页数：5

共 29 条

[1] Evidence for superconductivity with broken time-reversal symmetry in locally noncentrosymmetric SrPtAs [J].

Biswas, P. K. ;

Luetkens, H. ;

Neupert, T. ;

Stuerzer, T. ;

Baines, C. ;

Pascua, G. ;

Schnyder, A. P. ;

Fischer, M. H. ;

Goryo, J. ;

Lees, M. R. ;

Maeter, H. ;

Brueckner, F. ;

Klauss, H. -H. ;

Nicklas, M. ;

Baker, P. J. ;

Hillier, A. D. ;

Sigrist, M. ;

Amato, A. ;

Johrendt, D. .

PHYSICAL REVIEW B, 2013, 87 (18)

[2]

Bruckner F., ARXIV13126166

[3] Superconductivity and local noncentrosymmetricity in crystal lattices [J].

Fischer, Mark H. ;

Loder, Florian ;

Sigrist, Manfred .

PHYSICAL REVIEW B, 2011, 84 (18)

[4] Kohn-Luttinger superconductivity in graphene [J].

Gonzalez, J. .

PHYSICAL REVIEW B, 2008, 78 (20)

[5] Possible pairing symmetries in SrPtAs with a local lack of inversion center [J].

Goryo, Jun ;

Fischer, Mark H. ;

Sigrist, Manfred .

PHYSICAL REVIEW B, 2012, 86 (10)

[6] Accidental degeneracy in the energy bands of crystals [J].

Herring, C .

PHYSICAL REVIEW, 1937, 52 (04) :0365-0373

[7] Density waves and cooper pairing on the honeycomb lattice [J].

Honerkamp, Carsten .

PHYSICAL REVIEW LETTERS, 2008, 100 (14)

[8] Model Evidence of an Anisotropic Chiral d plus id-Wave Pairing State for the Water-Intercalated NaxCoO2 • yH2O Superconductor [J].

Kiesel, Maximilian L. ;

Platt, Christian ;

Hanke, Werner ;

Thomale, Ronny .

PHYSICAL REVIEW LETTERS, 2013, 111 (09)

[9] Competing many-body instabilities and unconventional superconductivity in graphene [J].

Kiesel, Maximilian L. ;

Platt, Christian ;

Hanke, Werner ;

Abanin, Dmitry A. ;

Thomale, Ronny .

PHYSICAL REVIEW B, 2012, 86 (02)

[10] Time-reversal symmetry breaking superconductivity in Sr2RuO4 [J].

Luke, GM ;

Fudamoto, Y ;

Kojima, KM ;

Larkin, MI ;

Merrin, J ;

Nachumi, B ;

Uemura, YJ ;

Maeno, Y ;

Mao, ZQ ;

Mori, Y ;

Nakamura, H ;

Sigrist, M .

NATURE, 1998, 394 (6693) :558-561

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