Competition between orbital effects, Pauli limiting, and Fulde–Ferrell–Larkin–Ovchinnikov states in 2D transition metal dichalcogenide superconductors
We compare the upper critical field of bulk single-crystalline samples of the two intrinsic transition metal dichalcogenide superconductors, 2H-NbSe _2 and 2H-NbS _2 , in high magnetic fields where their layer structure is aligned strictly parallel and perpendicular to the field, using magnetic torq...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/ac8114 |
| _version_ | 1797748321285046272 |
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| author | Chang-woo Cho Cheuk Yin Ng Chi Ho Wong Mahmoud Abdel-Hafiez Alexander N Vasiliev Dmitriy A Chareev A G Lebed Rolf Lortz |
| author_facet | Chang-woo Cho Cheuk Yin Ng Chi Ho Wong Mahmoud Abdel-Hafiez Alexander N Vasiliev Dmitriy A Chareev A G Lebed Rolf Lortz |
| author_sort | Chang-woo Cho |
| collection | DOAJ |
| description | We compare the upper critical field of bulk single-crystalline samples of the two intrinsic transition metal dichalcogenide superconductors, 2H-NbSe _2 and 2H-NbS _2 , in high magnetic fields where their layer structure is aligned strictly parallel and perpendicular to the field, using magnetic torque experiments and a high-precision piezo-rotary positioner. While both superconductors show that orbital effects still have a significant impact when the layer structure is aligned parallel to the field, the upper critical field of NbS _2 rises above the Pauli limiting field and forms a Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) state, while orbital effects suppress superconductivity in NbSe _2 just below the Pauli limit, which excludes the formation of the FFLO state. From the out-of-plane anisotropies, the coherence length perpendicular to the layers of 31 Å in NbSe _2 is much larger than the interlayer distance, leading to a significant orbital effect suppressing superconductivity before the Pauli limit is reached, in contrast to the more 2D NbS _2 . |
| first_indexed | 2024-03-12T16:04:14Z |
| format | Article |
| id | doaj.art-0a55270c94634aefaf5559854a7f69b2 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:04:14Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-0a55270c94634aefaf5559854a7f69b22023-08-09T14:26:01ZengIOP PublishingNew Journal of Physics1367-26302022-01-0124808300110.1088/1367-2630/ac8114Competition between orbital effects, Pauli limiting, and Fulde–Ferrell–Larkin–Ovchinnikov states in 2D transition metal dichalcogenide superconductorsChang-woo Cho0https://orcid.org/0000-0002-5190-7070Cheuk Yin Ng1Chi Ho Wong2Mahmoud Abdel-Hafiez3https://orcid.org/0000-0002-1802-5279Alexander N Vasiliev4Dmitriy A Chareev5A G Lebed6Rolf Lortz7https://orcid.org/0000-0002-4075-9375Department of Physics, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong Special Administrative Region of ChinaDepartment of Physics, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong Special Administrative Region of ChinaDepartment of Industrial and Systems Engineering, The Hong Kong Polytechnic University , 11 Yuk Choi Rd, Hung Hom, Kowloon, H ong Kong Special Administrative Region of ChinaDepartment of Physics and Astronomy, Uppsala University , Uppsala SE-75120, Sweden; Lyman Laboratory of Physics, Harvard University , Cambridge, MA 02138, United States of AmericaDepartment of Low Temperature Physics and Superconductivity, Lomonosov Moscow State University , Moscow 119991, Russia; Quantum Functional Materials Laboratory, National University of Science and Technology ‘MISiS’, Moscow 119049 , Russia; Ural Federal University , Ekaterinburg 620002, RussiaQuantum Functional Materials Laboratory, National University of Science and Technology ‘MISiS’, Moscow 119049 , Russia; Ural Federal University , Ekaterinburg 620002, Russia; Institute of Experimental Mineralogy , RAS, Chernogolovka, Moscow Region 142432, RussiaDepartment of Physics, University of Arizona , 1118 E. 4th Street, Tucson, AZ 85721, United States of America; Landau Institute for Theoretical Physics , RAS, 2 Kosygina Street, Moscow 117334, RussiaDepartment of Physics, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong Special Administrative Region of ChinaWe compare the upper critical field of bulk single-crystalline samples of the two intrinsic transition metal dichalcogenide superconductors, 2H-NbSe _2 and 2H-NbS _2 , in high magnetic fields where their layer structure is aligned strictly parallel and perpendicular to the field, using magnetic torque experiments and a high-precision piezo-rotary positioner. While both superconductors show that orbital effects still have a significant impact when the layer structure is aligned parallel to the field, the upper critical field of NbS _2 rises above the Pauli limiting field and forms a Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) state, while orbital effects suppress superconductivity in NbSe _2 just below the Pauli limit, which excludes the formation of the FFLO state. From the out-of-plane anisotropies, the coherence length perpendicular to the layers of 31 Å in NbSe _2 is much larger than the interlayer distance, leading to a significant orbital effect suppressing superconductivity before the Pauli limit is reached, in contrast to the more 2D NbS _2 .https://doi.org/10.1088/1367-2630/ac8114superconductivityFulde–Ferrell–Larkin–Ovchinnikov statetransition metal dichalcogenideNbSe2NbS2 |
| spellingShingle | Chang-woo Cho Cheuk Yin Ng Chi Ho Wong Mahmoud Abdel-Hafiez Alexander N Vasiliev Dmitriy A Chareev A G Lebed Rolf Lortz Competition between orbital effects, Pauli limiting, and Fulde–Ferrell–Larkin–Ovchinnikov states in 2D transition metal dichalcogenide superconductors New Journal of Physics superconductivity Fulde–Ferrell–Larkin–Ovchinnikov state transition metal dichalcogenide NbSe2 NbS2 |
| title | Competition between orbital effects, Pauli limiting, and Fulde–Ferrell–Larkin–Ovchinnikov states in 2D transition metal dichalcogenide superconductors |
| title_full | Competition between orbital effects, Pauli limiting, and Fulde–Ferrell–Larkin–Ovchinnikov states in 2D transition metal dichalcogenide superconductors |
| title_fullStr | Competition between orbital effects, Pauli limiting, and Fulde–Ferrell–Larkin–Ovchinnikov states in 2D transition metal dichalcogenide superconductors |
| title_full_unstemmed | Competition between orbital effects, Pauli limiting, and Fulde–Ferrell–Larkin–Ovchinnikov states in 2D transition metal dichalcogenide superconductors |
| title_short | Competition between orbital effects, Pauli limiting, and Fulde–Ferrell–Larkin–Ovchinnikov states in 2D transition metal dichalcogenide superconductors |
| title_sort | competition between orbital effects pauli limiting and fulde ferrell larkin ovchinnikov states in 2d transition metal dichalcogenide superconductors |
| topic | superconductivity Fulde–Ferrell–Larkin–Ovchinnikov state transition metal dichalcogenide NbSe2 NbS2 |
| url | https://doi.org/10.1088/1367-2630/ac8114 |
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