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Nodal Superconducting gap structure in the quasi-one-dimensional Cs2Cr3As3 investigated using muSR measurements
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Adroja, D. T., Bhattacharyya, Amitava, Smidman, M., Hillier, A. D. (Adrian D.), Feng, Yu, Pan, Bingying, Zhao, Jun, Lees, Martin R., Strydom, Andre and Biswas, P. K. (Pabitra K.) (2017) Nodal Superconducting gap structure in the quasi-one-dimensional Cs2Cr3As3 investigated using muSR measurements. Journal of the Physical Society of Japan, 86 (4). 044710. doi:10.7566/JPSJ.86.044710 ISSN 0031-9015.
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Official URL: https://doi.org/10.7566/JPSJ.86.044710
Abstract
The superconducting ground state of the newly discovered superconductor Cs2Cr3As3 [Tc ~ 2.1(1)K] with a quasi one-dimensional crystal structure has been investigated using magnetization and muon-spin relaxation and rotation (muSR), both zero-field (ZF) and transverse-field (TF), measurements.
Our ZF muSR measurements reveal the presence of spin fluctuations below 4 K and the ZF relaxation rate (lambda) shows an enhancement below Tc ~ 2.1 K, which might indicate that the superconducting state is unconventional. This observation suggests that the electrons are paired via unconventional channels such as spin fluctuations, as proposed on the basis of theoretical models.
Our analysis of the TF muSR results shows that the temperature dependence of the superfluid density is fitted better with a nodal gap structure than an isotropic s-wave model for the superconducting gap. The observation of a nodal gap in Cs2Cr3As3 is consistent with that observed in the isostructural K2Cr3As3 compound through TF muSR measurements. Furthermore, from our TF muSR study we have estimated the magnetic penetration depth of the polycrystalline sample lambda_L(0) = 954 nm, superconducting carrier density n_s = 4.98 10^26 m^-3, and carriers’ effective-mass enhancement m*= 1.61me.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Superconductivity., Condensed matter. | ||||||
| Journal or Publication Title: | Journal of the Physical Society of Japan | ||||||
| Publisher: | Physical Society of Japan | ||||||
| ISSN: | 0031-9015 | ||||||
| Official Date: | 21 March 2017 | ||||||
| Dates: |
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| Volume: | 86 | ||||||
| Number: | 4 | ||||||
| Article Number: | 044710 | ||||||
| DOI: | 10.7566/JPSJ.86.044710 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Copyright Holders: | The Physical Society of Japan | ||||||
| Date of first compliant deposit: | 12 April 2017 | ||||||
| Date of first compliant Open Access: | 22 March 2018 | ||||||
| Funder: | Centre for Material Physics & Chemistry, Nihon Gakujutsu Shinkōkai [Japan Society for the Promotion of Science] (NGS), University of Johannesburg, Ministry of Science and Technology of the People's Republic of China, National Natural Science Foundation of China (NSFC) | ||||||
| Grant number: | CMPC-09108, 2015CB921302, 91421106, 93549 |
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