Nodeless superconductivity in the type-II Dirac semimetal : London penetration depth and pairing-symmetry analysis
Abstract
Superconducting gap structure was probed in type-II Dirac semimetal PdTe2 by measuring the London penetration depth using the tunnel diode resonator technique. At low temperatures, the data for two samples are well described by a weak-coupling exponential fit yielding λ(T = 0) = 230 nm as the only fit parameter at a fixed Δ(0)/Tc ≈ 1.76, and the calculated superfluid density is consistent with a fully gapped superconducting state characterized by a single gap scale. Electrical resistivity measurements for in-plane and inter-plane current directions find very low and nearly temperature-independent normal-state anisotropy. The temperature dependence of resistivity is typical for conventional phonon scattering in metals. Here, we compare these experimental results with expectations from a detailed theoretical symmetry analysis and reduce the number of possible superconducting pairing states in PdTe2 to only three nodeless candidates: a regular, topologically trivial s-wave pairing, and two distinct odd-parity triplet states that both can be topologically nontrivial depending on the microscopic interactions driving the superconducting instability.
- Authors:
-
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Harvard Univ., Cambridge, MA (United States)
- Ames Lab., Ames, IA (United States)
- Iowa State Univ., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1460405
- Alternate Identifier(s):
- OSTI ID: 1460482
- Report Number(s):
- IS-J-9708
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1901877
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 2; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Teknowijoyo, S., Jo, Na Hyun, Scheurer, Mathias S., Tanatar, M. A., Cho, Kyuil, Bud'ko, S. L., Orth, Peter P., Canfield, P. C., and Prozorov, R. Nodeless superconductivity in the type-II Dirac semimetal PdTe2: London penetration depth and pairing-symmetry analysis. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.98.024508.
Teknowijoyo, S., Jo, Na Hyun, Scheurer, Mathias S., Tanatar, M. A., Cho, Kyuil, Bud'ko, S. L., Orth, Peter P., Canfield, P. C., & Prozorov, R. Nodeless superconductivity in the type-II Dirac semimetal PdTe2: London penetration depth and pairing-symmetry analysis. United States. https://doi.org/10.1103/PhysRevB.98.024508
Teknowijoyo, S., Jo, Na Hyun, Scheurer, Mathias S., Tanatar, M. A., Cho, Kyuil, Bud'ko, S. L., Orth, Peter P., Canfield, P. C., and Prozorov, R. Mon .
"Nodeless superconductivity in the type-II Dirac semimetal PdTe2: London penetration depth and pairing-symmetry analysis". United States. https://doi.org/10.1103/PhysRevB.98.024508. https://www.osti.gov/servlets/purl/1460405.
@article{osti_1460405,
title = {Nodeless superconductivity in the type-II Dirac semimetal PdTe2: London penetration depth and pairing-symmetry analysis},
author = {Teknowijoyo, S. and Jo, Na Hyun and Scheurer, Mathias S. and Tanatar, M. A. and Cho, Kyuil and Bud'ko, S. L. and Orth, Peter P. and Canfield, P. C. and Prozorov, R.},
abstractNote = {Superconducting gap structure was probed in type-II Dirac semimetal PdTe2 by measuring the London penetration depth using the tunnel diode resonator technique. At low temperatures, the data for two samples are well described by a weak-coupling exponential fit yielding λ(T = 0) = 230 nm as the only fit parameter at a fixed Δ(0)/Tc ≈ 1.76, and the calculated superfluid density is consistent with a fully gapped superconducting state characterized by a single gap scale. Electrical resistivity measurements for in-plane and inter-plane current directions find very low and nearly temperature-independent normal-state anisotropy. The temperature dependence of resistivity is typical for conventional phonon scattering in metals. Here, we compare these experimental results with expectations from a detailed theoretical symmetry analysis and reduce the number of possible superconducting pairing states in PdTe2 to only three nodeless candidates: a regular, topologically trivial s-wave pairing, and two distinct odd-parity triplet states that both can be topologically nontrivial depending on the microscopic interactions driving the superconducting instability.},
doi = {10.1103/PhysRevB.98.024508},
journal = {Physical Review B},
number = 2,
volume = 98,
place = {United States},
year = {2018},
month = {7}
}
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