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

Journal Article · · Physical Review B
 [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)

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-06NA25396; E3B7
OSTI ID:
1477720
Alternate ID(s):
OSTI ID: 1464580
Report Number(s):
LA-UR-17-28618; PRBMDO
Journal Information:
Physical Review B, Vol. 98, Issue 5; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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