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Title: Dimensional crossover in the quasi-one-dimensional superconductor TI2Mo6Se6
Authors: Mitra, S.
Petrović, Alexander Paul
Salloum, D.
Gougeon, P.
Potel, M.
Zhu, Jian-Xin
Panagopoulos, Christos
Chia, Elbert Ee Min
Keywords: Superconducting Phase Transition
XY Model
Issue Date: 2018
Source: Mitra, S., Petrović, A. P., Salloum, D., Gougeon, P., Potel, M., Zhu, J.-X., Panagopoulos, C.,& Chia, E. E. M. (2018). Dimensional crossover in the quasi-one-dimensional superconductor Tl2Mo6Se6. Physical Review B, 98(5), 054507-. doi:10.1103/PhysRevB.98.054507
Series/Report no.: Physical Review B
Abstract: 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. 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.
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.98.054507
Rights: © 2018 American Physical Society (APS). This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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