skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Point-node gap structure of the spin-triplet superconductor UTe 2

Abstract

In this work, low-temperature electrical and thermal transport, magnetic penetration depth, and heat capacity measurements were performed on single crystals of the actinide superconductor UTe 2 to determine the structure of the superconducting energy gap. Heat transport measurements performed with currents directed along both crystallographic a and b axes reveal a vanishingly small residual fermionic component of the thermal conductivity. The magnetic field dependence of the residual term follows a rapid, quasilinear increase consistent with the presence of nodal quasiparticles, rising toward the a -axis upper critical field where the Wiedemann-Franz law is recovered. Together with a quadratic temperature dependence of the magnetic penetration depth up to T / T c = 0.3 , these measurements provide evidence for an unconventional spin-triplet superconducting order parameter with point nodes. Millikelvin specific heat measurements performed on the same crystals used for thermal transport reveal an upturn below 300 mK that is well described by a divergent quantum-critical contribution to the density of states (DOS). Modeling this contribution with a T - 1 / 3 power law allows restoration of the full entropy balance in the superconducting state and a resultant cubic power law for the electronic DOS below T c , consistent with the point-node gap structure determined by thermal conductivity and penetration depth measurements.

Authors:
 [1]; ORCiD logo [1];  [2];  [2];  [1];  [1];  [3]; ORCiD logo [1];  [2]; ORCiD logo [4]
  1. Univ. of Maryland, College Park, MD (United States)
  2. Univ. of Maryland, College Park, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
  3. Univ. of Wisconsin, Milwaukee, WI (United States)
  4. Univ. of Maryland, College Park, MD (United States); Canadian Inst. for Advanced Research, Toronto, ON (Canada)
Publication Date:
Research Org.:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), High Energy Physics (HEP); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF); Gordon and Betty Moore Foundation
OSTI Identifier:
1604581
Grant/Contract Number:  
SC0018788; SC0019154; SC0017931; FA9550-14-1-0332; DMR-1410712; GBMF4419
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 22; 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; UTe2; penetration depth; electrical transport; thermal transport; heat capacity

Citation Formats

Metz, Tristin, Bae, Seokjin, Ran, Sheng, Liu, I-Lin, Eo, Yun Suk, Fuhrman, Wesley T., Agterberg, Daniel F., Anlage, Steven M., Butch, Nicholas P., and Paglione, Johnpierre. Point-node gap structure of the spin-triplet superconductor UTe2. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.220504.
Metz, Tristin, Bae, Seokjin, Ran, Sheng, Liu, I-Lin, Eo, Yun Suk, Fuhrman, Wesley T., Agterberg, Daniel F., Anlage, Steven M., Butch, Nicholas P., & Paglione, Johnpierre. Point-node gap structure of the spin-triplet superconductor UTe2. United States. doi:https://doi.org/10.1103/PhysRevB.100.220504
Metz, Tristin, Bae, Seokjin, Ran, Sheng, Liu, I-Lin, Eo, Yun Suk, Fuhrman, Wesley T., Agterberg, Daniel F., Anlage, Steven M., Butch, Nicholas P., and Paglione, Johnpierre. Thu . "Point-node gap structure of the spin-triplet superconductor UTe2". United States. doi:https://doi.org/10.1103/PhysRevB.100.220504. https://www.osti.gov/servlets/purl/1604581.
@article{osti_1604581,
title = {Point-node gap structure of the spin-triplet superconductor UTe2},
author = {Metz, Tristin and Bae, Seokjin and Ran, Sheng and Liu, I-Lin and Eo, Yun Suk and Fuhrman, Wesley T. and Agterberg, Daniel F. and Anlage, Steven M. and Butch, Nicholas P. and Paglione, Johnpierre},
abstractNote = {In this work, low-temperature electrical and thermal transport, magnetic penetration depth, and heat capacity measurements were performed on single crystals of the actinide superconductor UTe2 to determine the structure of the superconducting energy gap. Heat transport measurements performed with currents directed along both crystallographic a and b axes reveal a vanishingly small residual fermionic component of the thermal conductivity. The magnetic field dependence of the residual term follows a rapid, quasilinear increase consistent with the presence of nodal quasiparticles, rising toward the a-axis upper critical field where the Wiedemann-Franz law is recovered. Together with a quadratic temperature dependence of the magnetic penetration depth up to T/Tc=0.3, these measurements provide evidence for an unconventional spin-triplet superconducting order parameter with point nodes. Millikelvin specific heat measurements performed on the same crystals used for thermal transport reveal an upturn below 300 mK that is well described by a divergent quantum-critical contribution to the density of states (DOS). Modeling this contribution with a T-1/3 power law allows restoration of the full entropy balance in the superconducting state and a resultant cubic power law for the electronic DOS below Tc, consistent with the point-node gap structure determined by thermal conductivity and penetration depth measurements.},
doi = {10.1103/PhysRevB.100.220504},
journal = {Physical Review B},
number = 22,
volume = 100,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Review of U-based Ferromagnetic Superconductors: Comparison between UGe 2 , URhGe, and UCoGe
journal, February 2019

  • Aoki, Dai; Ishida, Kenji; Flouquet, Jacques
  • Journal of the Physical Society of Japan, Vol. 88, Issue 2
  • DOI: 10.7566/JPSJ.88.022001

Nearly ferromagnetic spin-triplet superconductivity
journal, August 2019


Unconventional Superconductivity in Heavy Fermion UTe 2
journal, April 2019

  • Aoki, Dai; Nakamura, Ai; Honda, Fuminori
  • Journal of the Physical Society of Japan, Vol. 88, Issue 4
  • DOI: 10.7566/JPSJ.88.043702

Extreme magnetic field-boosted superconductivity
journal, October 2019


Metamagnetic Transition in Heavy Fermion Superconductor UTe 2
journal, June 2019

  • Miyake, Atsushi; Shimizu, Yusei; Sato, Yoshiki J.
  • Journal of the Physical Society of Japan, Vol. 88, Issue 6
  • DOI: 10.7566/JPSJ.88.063706

Coexistence of ferromagnetic fluctuations and superconductivity in the actinide superconductor UTe 2
journal, October 2019


Heat transport as a probe of superconducting gap structure
journal, May 2009


Magnetic penetration depth in unconventional superconductors
journal, June 2006


Modular portable unit for thermal conductivity measurements in multiple cryogenic/magnetic field environments
journal, January 2018

  • Tanatar, M. A.; Bondarenko, V. A.; Timmons, E. I.
  • Review of Scientific Instruments, Vol. 89, Issue 1
  • DOI: 10.1063/1.5001708

Origin of anomalous low-temperature downturns in the thermal conductivity of cuprates
journal, January 2005


Dielectric resonator method for determining gap symmetry of superconductors through anisotropic nonlinear Meissner effect
journal, April 2019

  • Bae, Seokjin; Tan, Yuewen; Zhuravel, Alexander P.
  • Review of Scientific Instruments, Vol. 90, Issue 4
  • DOI: 10.1063/1.5090130

Symmetry properties of triplet superconductors
journal, September 1985


Tensor Magnetothermal Resistance in YBa 2 Cu 3 O 7 x via Andreev Scattering of Quasiparticles
journal, June 1995


Angular Position of Nodes in the Superconducting Gap of YBCO
journal, March 1997


Angular Position of Nodes in the Superconducting Gap of Quasi-2D Heavy-Fermion Superconductor CeCoIn 5
journal, July 2001


Thermal conductivity and gap structure of the superconducting phases of UPt3
journal, July 1997

  • Suderow, H.; Brison, J. P.; Huxley, A.
  • Journal of Low Temperature Physics, Vol. 108, Issue 1-2
  • DOI: 10.1007/BF02396814

Determination of the gap structure in UPt 3 by thermal conductivity
journal, March 1996


Hybrid Gap Structure of the Heavy-Fermion Superconductor CeIrIn 5
journal, October 2007


Universal Heat Conduction in the Iron Arsenide Superconductor KFe 2 As 2 : Evidence of a d -Wave State
journal, August 2012


Heat Conduction in the Vortex State of N b S e 2 : Evidence for Multiband Superconductivity
journal, March 2003


Unconventional Superconductivity in CeIrI n 5 and CeCoIn 5 : Specific Heat and Thermal Conductivity Studies
journal, May 2001


Unpaired Electrons in the Heavy-Fermion Superconductor CeCoIn 5
journal, August 2005


Thermal conductivity in the ab plane of untwinned YBa 2 Cu 3 O 7 δ
journal, June 1992


Electronic thermal conductivity and the Wiedemann-Franz law for unconventional superconductors
journal, June 1996


Theory of the Thermal Conductivity of Superconductors
journal, February 1959


Mixed-state thermal conductivity of type II superconductors
journal, July 1970

  • Lowell, J.; Sousa, J. B.
  • Journal of Low Temperature Physics, Vol. 3, Issue 1
  • DOI: 10.1007/BF00628399

Thermal conductivity of superconducting alloy films in a perpendicular magnetic field
journal, September 1976


Thermal conductivity measurements of the energy-gap anisotropy of superconducting LaFePO at low temperatures
journal, December 2009


Thermal conductivity of superconducting Sr 2 RuO 4 in oriented magnetic fields
journal, January 2001


The superconducting phases of UPt 3
journal, March 2002


Effect of strong scattering on the low-temperature penetration depth of a d -wave superconductor
journal, August 1993


Magnetic Field Penetration Depth in the Heavy-Electron Superconductor U Be 13
journal, June 1986


Anomalous temperature dependence of the magnetic field penetration depth in superconducting UBe13
journal, June 1986

  • Gross, F.; Chandrasekhar, B. S.; Einzel, D.
  • Zeitschrift f�r Physik B Condensed Matter, Vol. 64, Issue 2
  • DOI: 10.1007/BF01303700

    Works referencing / citing this record:

    Chiral superconductivity in heavy-fermion metal UTe2
    journal, March 2020


    Experimental consequences of Bogoliubov Fermi surfaces
    journal, January 2020