Ising pairing in superconducting NbSe2 atomic layers

Nature Physics

Volumn 12, Issue 2, 2016, Pages 139-143

  Xi, Xiaoxiang ^a   Wang, Zefang ^a   Zhao, Weiwei ^a   Park, Ju Hyun ^b   Law, Kam Tuen ^c   Berger, Helmuth ^d   Forró, László ^d   Shan, Jie ^a   Mak, Kin Fai ^a  

^a PENNSYLVANIA STATE UNIVERSITY   (United States)

^b FLORIDA STATE UNIVERSITY   (United States)

^c HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY   (Hong Kong)

^d EPFL   (Switzerland)

Author keywords

[No Author keywords available]

Indexed keywords

DEGREES OF FREEDOM (MECHANICS); ELECTROSPINNING; LANDFORMS; LOCKS (FASTENERS); MAGNETIC MOMENTS; MONOLAYERS; NIOBIUM COMPOUNDS; TRANSITION METALS;

EXCITONIC PHENOMENA; MAGNETO-TRANSPORT MEASUREMENT; NON-CENTROSYMMETRIC; OUT-OF-PLANE DIRECTION; PARAMAGNETIC LIMITS; SPIN ORBIT INTERACTIONS; TRANSITION METAL DICHALCOGENIDES; UPPER CRITICAL FIELDS;

SELENIUM COMPOUNDS;

EID: 84956642129     PISSN: 17452473     EISSN: 17452481     Source Type: Journal    
DOI: 10.1038/nphys3538     Document Type: Article

References (48)

1. Xu, X., Yao,W., Xiao, D. & Heinz, T. F. Spin and pseudospins in layered transition metal dichalcogenides. Nature Phys. 10, 343-350 (2014).
2. Xiao, D., Liu, G.-B., Feng,W., Xu, X. & Yao,W. Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides. Phys. Rev. Lett. 108, 196802 (2012).
3. Mak, K. F., He, K., Shan, J. & Heinz, T. F. Control of valley polarization in monolayer MoS2 by optical helicity. Nature Nanotech. 7, 494-498 (2012).
4. Zeng, H., Dai, J., Yao,W., Xiao, D. & Cui, X. Valley polarization in MoS2 monolayers by optical pumping. Nature Nanotech. 7, 490-493 (2012).
5. Mak, K. F., McGill, K. L., Park, J. & McEuen, P. L. The valley Hall effect in MoS2 transistors. Science 344, 1489-1492 (2014).
6. Jones, A. M., et al. Spin-layer locking effects in optical orientation of exciton spin in bilayerWSe2. Nature Phys. 10, 130-134 (2014).
7. Riley, J. M., et al. Direct observation of spin-polarized bulk bands in an inversion-symmetric semiconductor. Nature Phys. 10, 835-839 (2014).
8. Mattheiss, L. F. Band structures of transition-metal-Dichalcogenide layer compounds. Phys. Rev. B 8, 3719-3740 (1973).
9. Foner, S. & McNi-, E. J. Upper critical fields of layered superconducting NbSe2 at low temperature. Phys. Lett. A 45, 429-430 (1973).
10. de Trey, P., Gygax, S. & Jan, J. P. Anisotropy of Ginzburg-Landau parameter-in NbSe2. J. Low Temp. Phys. 11, 421-434 (1973).
11. Hess, H. F., Robinson, R. B., Dynes, R. C., Valles, J. M. &Waszczak, J. V. Scanning-Tunneling-microscope observation of the Abrikosov flux lattice and the density of states near and inside a fluxoid. Phys. Rev. Lett. 62, 214-216 (1989).
12. Huang, C. L., et al. Experimental evidence for a two-gap structure of superconducting NbSe2: A specific-heat study in external magnetic fields. Phys. Rev. B 76, 212504 (2007).
13. Yokoya, T., et al. Fermi surface sheet-Dependent superconductivity in 2H-NbSe2. Science 294, 2518-2520 (2001).
14. Rahn, D. J., et al. Gaps and kinks in the electronic structure of the superconductor 2H-NbSe2 from angle-resolved photoemission at 1 K. Phys. Rev. B 85, 224532 (2012).
15. Frindt, R. F. Superconductivity in ultrathin NbSe2 layers. Phys. Rev. Lett. 28, 299-301 (1972).
16. Staley, N. E., et al. Electric field effect on superconductivity in atomically thin flakes of NbSe2. Phys. Rev. B 80, 184505 (2009).
17. Xi, X., et al. Strongly enhanced charge-Density-wave order in monolayer NbSe2. Nature Nanotech. 10, 765-769 (2015).
18. Cao, Y., et al Quality heterostructures from two-Dimensional crystals unstable in air by their assembly in inert atmosphere. Nano Lett. 15, 4914-4921 (2015).
19. Johannes, M. D., Mazin, I. I. & Howells, C. A. Fermi-surface nesting and the origin of the charge-Density wave in NbSe2. Phys. Rev. B 73, 205102 (2006).
20. Tinkham, M Introduction to Superconductivity 2nd edn (McGraw-Hill, 1996).
21. Chandrasekhar, B. S. A note on the maximum critical field of high-field superconductors. Appl. Phys. Lett. 1, 7-8 (1962).
22. Clogston, A. M. Upper limit for critical field in hard superconductors. Phys. Rev. Lett. 9, 266-267 (1962).
23. Bauer, E. & Sigrist, M. Non-centrosymmetric Superconductors: Introduction and Overview (Springer, 2012).
24. Sigrist, M. Introduction to unconventional superconductivity in non-centrosymmetric metals. AIP Conf. Proc. 1162, 55-97 (2009).
25. Youn, S. J., et al. Role of strong spin-orbit coupling in the superconductivity of the hexagonal pnictide SrPtAs. Phys. Rev. B 85, 220505(R) (2012).
26. Fiory, A. T. & Hebard, A. F. Electron mobility, conductivity, and superconductivity near the metal-insulator transition. Phys. Rev. Lett. 52, 2057-2060 (1984).
27. Beasley, M. R., Mooij, J. E. & Orlando, T. P. Possibility of vortex-Antivortex pair dissociation in two-Dimensional superconductors. Phys. Rev. Lett. 42, 1165-1168 (1979).
28. Aslamazov, L. G. & Larkin, A. I. The influence of fluctuation pairing of electrons on conductivity of normal metal. Phys. Lett. A 26, 238-239 (1968).
29. Li, Q., et al. Interlayer coupling effect in high-Tc superconductors probed by YBa2Cu3O7 x/PrBa2Cu3O7 x superlattices. Phys. Rev. Lett. 64, 3086-3089 (1990).
30. Schneider, T., Gedik, Z. & Ciraci, S. Transition temperature of superconductor-insulator superlattices. Europhys. Lett. 14, 261-266 (1991).
31. Prober, D. E., Schwall, R. E. & Beasley, M. R. Upper critical fields and reduced dimensionality of the superconducting layered compounds. Phys. Rev. B 21, 2717-2733 (1980).
32. Tedrow, P. M. & Meservey, R. Critical magnetic field of very thin superconducting aluminum films. Phys. Rev. B 25, 171-178 (1982).
33. Lee, I. J., Chaikin, P. M. & Naughton, M. J. Exceeding the Pauli paramagnetic limit in the critical field of (TMTSF)2PF6. Phys. Rev. B 62, 14669-14672 (2000).
34. Klemm, R. A. Layered Superconductors Vol. 1 (Oxford Univ. Press, 2012).
35. Kimura, N., et al. Extremely high upper critical field of the noncentrosymmetric heavy Fermion superconductor CeRhSi3. Phys. Rev. Lett. 98, 197001 (2007).
36. Saito, Y., et al. Superconductivity protected by spin-valley locking in gate-Tuned MoS2. Preprint at http://arXiv.org/abs/1506.04146 (2015).
37. Lu, J. M., et al. Two dimensional Ising superconductivity in gated MoS2. Preprint at http://arXiv.org/abs/1506.07620 (2015).
38. Agosta, C. C., et al. Experimental and semiempirical method to determine the Pauli-limiting field in quasi-Two-Dimensional superconductors as applied to-(BEDT-TTF)2Cu(NCS)2: Strong evidence of a FFLO state. Phys. Rev. B 85, 214514 (2012).
39. Rainer, D. & Bergmann, G. Temperature dependence of Hc2 and-1 in strong coupling superconductors. J. Low Temp. Phys. 14, 501-519 (1974).
40. Orlando, T. P. & Beasley, M. R. Pauli limiting and the possibility of spin fluctuations in the A15 superconductors. Phys. Rev. Lett. 46, 1598-1601 (1981).
41. Matsuda, Y. & Shimahara, H. Fulde-Ferrell-Larkin-Ovchinnikov state in heavy fermion superconductors. J. Phys. Soc. Jpn 76, 051005 (2007).
42. Maki, K. Effect of Pauli paramagnetism on magnetic properties of high-field superconductors. Phys. Rev. 148, 362-369 (1966).
43. Werthamer, N. R., Helfand, E. & Hohenberg, P. C. Temperature and purity dependence of superconducting critical field, Hc2. III. Electron spin and spin-orbit effects. Phys. Rev. 147, 295-302 (1966).
44. Klemm, R. A., Luther, A. & Beasley, M. R. Theory of upper critical field in layered superconductors. Phys. Rev. B 12, 877-891 (1975).
45. Kiss, T., et al. Charge-order-maximized momentum-Dependent superconductivity. Nature Phys. 3, 720-725 (2007).
46. Goh, S. K., et al. Anomalous upper critical field in CeCoIn5/YbCoIn5 superlattices with a Rashba-Type heavy Fermion interface. Phys. Rev. Lett. 109, 157006 (2012).
47. Saint-James, D., Sarma, G. & Thomas, E. J. Type II Superconductivity (Pergamon, 1969).
48. Qi, X.-L. & Zhang, S.-C. Topological insulators and superconductors. Rev. Mod. Phys. 83, 1057-1110 (2011).