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

Journal Article · · Science Advances
ORCiD logo [1];  [2];  [3];  [2]; ORCiD logo [2]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [4];  [5];  [6]; ORCiD logo [7]; ORCiD logo [7]; ORCiD logo [2]
  1. Univ. of Maryland, College Park, MD (United States); Ames Lab., Ames, IA (United States)
  2. Univ. of Maryland, College Park, MD (United States)
  3. Univ. of Maryland, College Park, MD (United States); Univ. of Central Florida, Orlando, FL (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  5. Univ. of Maryland, College Park, MD (United States); Univ. of Otago, Dunedin (New Zealand)
  6. Univ. of Wisconsin, Madison, WI (United States)
  7. 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; DMREF-1335215; SC-0010605; AC02-07CH11358; GBMF4419
OSTI ID:
1460308
Alternate ID(s):
OSTI ID: 1433652
Report Number(s):
IS-J 9234; ark:/13030/qt6r34j85g
Journal Information:
Science Advances, Vol. 4, Issue 4; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 110 works
Citation information provided by
Web of Science

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Cited By (16)

Tunnel diode resonator for precision magnetic susceptibility measurements in a mK temperature range and large DC magnetic fields journal September 2018
Heusler interfaces—Opportunities beyond spintronics? journal August 2019
Semilocal exchange-correlation potentials for solid-state calculations: Current status and future directions journal September 2019
Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn 3 journal April 2019
Weak antilocalization within a genuine multiband model journal September 2019
Antilocalization in oxides: Effective spin- 3 2 model journal September 2019
Interacting Majorana modes at surfaces of noncentrosymmetric superconductors journal January 2020
Evidence for unconventional superconductivity in half-Heusler YPdBi and TbPdBi compounds revealed by London penetration depth measurements journal December 2018
Tailoring $T_c$ by symmetry principles: The concept of Superconducting Fitness text January 2018
Weak-Pairing Higher Order Topological Superconductors text January 2018
Bogoliubov Fermi surfaces: General theory, magnetic order, and topology text January 2018
Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn3 text January 2018
Dielectric and electronic properties of three-dimensional Luttinger semimetals with a quadratic band touching text January 2019
Experimental consequences of Bogoliubov Fermi surfaces text January 2019
On the Fisk–Tait equation for spin-3/2 fermions interacting with an external magnetic field in noncommutative space-time journal January 2020
Structure and superconductivity in the binary Re$_{1-x}$Mo$_x$ alloys text January 2019

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