Beyond triplet: Unconventional superconductivity in a spin-3/2 topological semimetal

Kim, Hyunsoo; Wang, Kefeng; Nakajima, Yasuyuki; Hu, Rongwei; Ziemak, Steven; Syers, Paul; Wang, Limin; Hodovanets, Halyna; Denlinger, Jonathan D.; Brydon, Philip M.  R.; Agterberg, Daniel F.; Tanatar, Makariy A.; Prozorov, Ruslan; Paglione, Johnpierre

doi:10.1126/sciadv.aao4513

Beyond triplet: Unconventional superconductivity in a spin-3/2 topological semimetal

Journal Article · Fri Apr 06 04:00:00 EDT 2018 · Science Advances

DOI:https://doi.org/10.1126/sciadv.aao4513· OSTI ID:1433652

^[1]; Wang, Kefeng ^[2]; Nakajima, Yasuyuki ^[3]; Hu, Rongwei ^[2]; ^[2]; ^[2]; Wang, Limin ^[2]; ^[2]; ^[4]; Brydon, Philip M. R. ^[5]; Agterberg, Daniel F. ^[6]; ^[7]; ^[7]; ^[2]

Univ. of Maryland, College Park, MD (United States); Ames Lab., Ames, IA (United States)
Univ. of Maryland, College Park, MD (United States)
Univ. of Maryland, College Park, MD (United States); Univ. of Central Florida, Orlando, FL (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Univ. of Maryland, College Park, MD (United States); Univ. of Otago, Dunedin (New Zealand)
Univ. of Wisconsin, Madison, WI (United States)
Ames Lab., Ames, IA (United States)

In all known fermionic super fluids, Cooper pairs are composed of spin-1/2 quasi-particles that pair to form either spin-singlet or spin-triplet bound states. The "spin" of a Bloch electron, however, is xed by the symmetries of the crystal and the atomic orbitals from which it is derived, and in some cases can behave as if it were a spin-3/2 particle. The superconducting state of such a system allows pairing beyond spin-triplet, with higher spin quasi-particles combining to form quintet or even septet pairs. Here, we report evidence of unconventional superconductivity emerging from a spin-3/2 quasiparticle electronic structure in the half-Heusler semimetal YPtBi, a low-carrier density noncentrosymmetric cubic material with a high symmetry that preserves the p-like j = 3/2 manifold in the Bi-based Γ₈ band in the presence of strong spin-orbit coupling. With a striking linear temperature dependence of the London penetration depth, the existence of line nodes in the superconducting order parameter Δ is directly explained by a mixed-parity Cooper pairing model with high total angular momentum, consistent with a high-spin fermionic super fluid state. We propose a k ∙ p model of the j = 3/2 fermions to explain how a dominant J=3 septet pairing state is the simplest solution that naturally produces nodes in the mixed even-odd parity gap. Together with the underlying topologically non-trivial band structure, the unconventional pairing in this system represents a truly novel form of super fluidity that has strong potential for leading the development of a new generation of topological superconductors.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0010605; AC02-07CH11358; AC02-05CH11231

OSTI ID:: 1433652

Alternate ID(s):: OSTI ID: 1460308

Report Number(s):: IS--J 9234

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 4 Vol. 4; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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