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Title: Nodeless superconductivity in the type-II Dirac semimetal PdTe 2 : London penetration depth and pairing-symmetry analysis

Abstract

Superconducting gap structure was probed in type-II Dirac semimetal PdTe 2 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)/ T c ≈ 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 PdTe 2 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:
 [1];  [1];  [2];  [1];  [3];  [1];  [4];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Harvard Univ., Cambridge, MA (United States)
  3. Ames Lab., Ames, IA (United States)
  4. Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
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. 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., and Prozorov, R. Mon . "Nodeless superconductivity in the type-II Dirac semimetal PdTe2: London penetration depth and pairing-symmetry analysis". United States. doi: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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