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Title: Dimensional crossover in the quasi-one-dimensional superconductor Tl 2 Mo 6 Se 6

Abstract

Here, we present magnetic penetration depth and electrical transport data in single crystals of quasi-one-dimensional (q1D) Tl 2Mo 6Se 6, which reveal a 1D→3D superconducting dimensional crossover. The c-axis penetration depth shows the onset of superconducting fluctuations below T ons 1D = 6.7 K, whereas signatures of superconductivity in the ab-plane penetration depth (a uniquely sensitive probe of the transverse phase stiffness) only emerge below T ons 3D = 4.9 K. An anomalously low superfluid density persists down to ~3 K before rising steeply, in agreement with a theoretical model for crossovers in q1D superconductors. Our data analysis suggests that a sequence of pairing and phase fluctuation regimes controls the unusually broad superconducting transition. In particular, the electrical resistivity below T ons 3D is quantitatively consistent with the establishment of phase coherence through gradual binding of Josephson vortex strings to form 3D loops. This dimensional crossover within the superconducting state occurs despite the relatively large transverse hopping predicted from the band structure. Furthermore, our results have important consequences for the low-temperature normal state in Tl 2Mo 6Se 6 and similar q1D metals, which may retain one-dimensional behavior to lower temperatures than expected from theory.

Authors:
 [1];  [1];  [2];  [3];  [3]; ORCiD logo [4];  [1];  [1]
  1. Nanyang Technological Univ. (Singapore)
  2. Univ. de Rennes, Rennes Cedex (France); Lebanese Univ., Kobbeh-Tripoli (Lebanon)
  3. Univ. de Rennes, Rennes Cedex (France)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1477720
Alternate Identifier(s):
OSTI ID: 1464580
Report Number(s):
LA-UR-17-28618
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC52-06NA25396; E3B7
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 5; 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; Material Science

Citation Formats

Mitra, S., Petrović, A. P., Salloum, D., Gougeon, P., Potel, M., Zhu, Jian -Xin, Panagopoulos, C., and Chia, Elbert E. M. Dimensional crossover in the quasi-one-dimensional superconductor Tl2Mo6Se6. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.054507.
Mitra, S., Petrović, A. P., Salloum, D., Gougeon, P., Potel, M., Zhu, Jian -Xin, Panagopoulos, C., & Chia, Elbert E. M. Dimensional crossover in the quasi-one-dimensional superconductor Tl2Mo6Se6. United States. doi:10.1103/PhysRevB.98.054507.
Mitra, S., Petrović, A. P., Salloum, D., Gougeon, P., Potel, M., Zhu, Jian -Xin, Panagopoulos, C., and Chia, Elbert E. M. Tue . "Dimensional crossover in the quasi-one-dimensional superconductor Tl2Mo6Se6". United States. doi:10.1103/PhysRevB.98.054507. https://www.osti.gov/servlets/purl/1477720.
@article{osti_1477720,
title = {Dimensional crossover in the quasi-one-dimensional superconductor Tl2Mo6Se6},
author = {Mitra, S. and Petrović, A. P. and Salloum, D. and Gougeon, P. and Potel, M. and Zhu, Jian -Xin and Panagopoulos, C. and Chia, Elbert E. M.},
abstractNote = {Here, we present magnetic penetration depth and electrical transport data in single crystals of quasi-one-dimensional (q1D) Tl2Mo6Se6, which reveal a 1D→3D superconducting dimensional crossover. The c-axis penetration depth shows the onset of superconducting fluctuations below Tons1D = 6.7 K, whereas signatures of superconductivity in the ab-plane penetration depth (a uniquely sensitive probe of the transverse phase stiffness) only emerge below Tons3D = 4.9 K. An anomalously low superfluid density persists down to ~3 K before rising steeply, in agreement with a theoretical model for crossovers in q1D superconductors. Our data analysis suggests that a sequence of pairing and phase fluctuation regimes controls the unusually broad superconducting transition. In particular, the electrical resistivity below Tons3D is quantitatively consistent with the establishment of phase coherence through gradual binding of Josephson vortex strings to form 3D loops. This dimensional crossover within the superconducting state occurs despite the relatively large transverse hopping predicted from the band structure. Furthermore, our results have important consequences for the low-temperature normal state in Tl2Mo6Se6 and similar q1D metals, which may retain one-dimensional behavior to lower temperatures than expected from theory.},
doi = {10.1103/PhysRevB.98.054507},
journal = {Physical Review B},
number = 5,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

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