Academic Journal
Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory
| العنوان: | Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory |
|---|---|
| المؤلفون: | Kvashnin, Y., Vangennep, D., Mito, M., Medvedev, S. A., Thiyagarajan, R., Karis, O., Vasiliev, A. N., Eriksson, O., Abdel-Hafiez, M. |
| المصدر: | Phys Rev Lett ; Physical Review Letters |
| بيانات النشر: | American Physical Society |
| سنة النشر: | 2020 |
| المجموعة: | Ural Federal University (URFU): ELAR / Уральский федеральный университет: электронный архив УрФУ |
| مصطلحات موضوعية: | CALCULATIONS, CHARGE DENSITY, CHARGE DENSITY WAVES, ELECTRONIC STRUCTURE, HYDROSTATIC PRESSURE, PHONONS, SHEAR WAVES, SULFUR COMPOUNDS, SUPERCONDUCTING TRANSITION TEMPERATURE, TEMPERATURE DISTRIBUTION, ELECTRONIC TOPOLOGICAL TRANSITION, FIRST-PRINCIPLES CALCULATION, LOWER CRITICAL FIELD, MAGNETICTRANSPORT PROPERTIES, PHONON INSTABILITIES, TEMPERATURE DEPENDENCE, UNDISTORTED STRUCTURE, VORTEX PENETRATION, TANTALUM COMPOUNDS |
| الوصف: | The coexistence of charge density wave (CDW) and superconductivity in tantalum disulfide (2H-TaS2) at low temperature is boosted by applying hydrostatic pressures to study both vibrational and magnetic transport properties. Around Pc, we observe a superconducting dome with a maximum superconducting transition temperature Tc=9.1 K. First-principles calculations of the electronic structure predict that, under ambient conditions, the undistorted structure is characterized by a phonon instability at finite momentum close to the experimental CDW wave vector. Upon compression, this instability is found to disappear, indicating the suppression of CDW order. The calculations reveal an electronic topological transition (ETT), which occurs before the suppression of the phonon instability, suggesting that the ETT alone is not directly causing the structural change in the system. The temperature dependence of the first vortex penetration field has been experimentally obtained by two independent methods. While a d wave and single-gap BCS prediction cannot describe the lower critical field Hc1 data, the temperature dependence of the Hc1 can be well described by a single-gap anisotropic s-wave order parameter. © 2020 authors. Published by the American Physical Society. ; Y. K. and M. A. H. acknowledge the financial support from the Swedish Research Council (VR) under the Projects No. 2019-03569 and No. 2018-05393. O. E. acknowledges support from the Swedish Research Council, the Knut and Alice Wallenberg Foundation and The Swedish e-science effort, eSSENCE. This work has been supported by Act 211 of the Government of Russian Federation, contracts 02.A03.21.0006 and 02.A03.21.0011. DFG through the Würzburg-Dresden Cluster of Excellence (EXC 2147, Project No. 39085490). |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | Coexistence of Superconductivity and Charge Density Waves in Tantalum Disulfide: Experiment and Theory / Y. Kvashnin, D. Vangennep, M. Mito, et al. — DOI 10.1103/PhysRevLett.125.186401 // Physical Review Letters. — 2020. — Vol. 125. — Iss. 18. — 186401.; 319007; Final; All Open Access, Hybrid Gold, Green; https://www.scopus.com/inward/record.uri?eid=2-s2.0-85094879316&doi=10.1103%2fPhysRevLett.125.186401&partnerID=40&md5=3c1cf5ef036211b00d21be737b1b60e0; http://link.aps.org/pdf/10.1103/PhysRevLett.125.186401; http://elar.urfu.ru/handle/10995/103361; 85094879316 |
| DOI: | 10.1103/PhysRevLett.125.186401 |
| الاتاحة: | http://elar.urfu.ru/handle/10995/103361 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85094879316&doi=10.1103%2fPhysRevLett.125.186401&partnerID=40&md5=3c1cf5ef036211b00d21be737b1b60e0 http://link.aps.org/pdf/10.1103/PhysRevLett.125.186401 https://doi.org/10.1103/PhysRevLett.125.186401 |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.DBC88451 |
| قاعدة البيانات: | BASE |
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Around Pc, we observe a superconducting dome with a maximum superconducting transition temperature Tc=9.1 K. First-principles calculations of the electronic structure predict that, under ambient conditions, the undistorted structure is characterized by a phonon instability at finite momentum close to the experimental CDW wave vector. Upon compression, this instability is found to disappear, indicating the suppression of CDW order. The calculations reveal an electronic topological transition (ETT), which occurs before the suppression of the phonon instability, suggesting that the ETT alone is not directly causing the structural change in the system. The temperature dependence of the first vortex penetration field has been experimentally obtained by two independent methods. While a d wave and single-gap BCS prediction cannot describe the lower critical field Hc1 data, the temperature dependence of the Hc1 can be well described by a single-gap anisotropic s-wave order parameter. © 2020 authors. Published by the American Physical Society. ; Y. K. and M. A. H. acknowledge the financial support from the Swedish Research Council (VR) under the Projects No. 2019-03569 and No. 2018-05393. O. E. acknowledges support from the Swedish Research Council, the Knut and Alice Wallenberg Foundation and The Swedish e-science effort, eSSENCE. This work has been supported by Act 211 of the Government of Russian Federation, contracts 02.A03.21.0006 and 02.A03.21.0011. 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