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양자물질초전도연구실에서 로스알라모스 국립연구소  Roman Movshovich 박사님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다.


Date/time: 2019. 02. 08(Fri.) 11:00


Place: Creative Room on 7th Floor of Samsung Library


Speaker: Dr. Roman Movshovich (Los Alamos National Laboratory)


Title: Intertwined states in the pure and Nd-doped heavy fermion superconductor CeCoIn5


Abstract: CeCoIn5 is a heavy fermion superconductor with superconducting transition temperature Tc = 2.3 K and superconducting critical field Hc2 = 12 Tesla when the field is applied in the a-b plane of this tetragonal material. Specific heat measurements revealed an anomaly that carved out a novel high field superconducting (HFSC) phase, possibly a long sought after spatially inhomogeneous Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state. Further NMR and neutron scattering measurements revealed a magnetic spin density wave (SDW) order stabilized in the HFSC phase, and therefore relying on the present d-wave superconductivity for its existence. Recent neutron scattering measurements [2] indicated that the SDW order in the HFSC phase is single-domain. The ordering wave-vector Q switches abruptly when magnetic field is rotated through the anti-nodal [100] direction, with Q choosing the direction (node) more perpendicular to the magnetic field. Inspired by these results, we performed thermal conductivity measurements in rotating magnetic field. The sample, polished with a long axis in the [110] direction of the tetragonal CeCoIn5, nodal for its dx2-y2 order parameter, was mounted with c-axis parallel to the horizontal axis of rotation of a piezo-electric rotator. Q in our experiment, therefore, switched from being parallel to perpendicular to the direction of the heat current. The sign of the change in thermal conductivity upon switching of Q provide a clear evidence for a third order, in addition to SC d-wave and SDW. We identify it as a p-wave pair density wave (PDW), intertwined with two others in the HFSC phase [1]. Further measurements of the Nd-doped CeCoIn5 indicate that the phenomena of p-wave PDW in the presence of d-wave superconductivity and SDW order may be a general phenomenon. [3]
[1] Duk Y. Kim, Shi-Zeng Lin, Franziska Weickert, Michel Kenzelmann, Eric D. Bauer, Filip Ronning, J. D. Thompson, and Roman Movshovich (2016) Phys. Rev. X 6: 041059.
[2] S. Gerber, M. Bartkowiak, J. L. Gavilano, E. Ressouche, N. Egetenmeyer, C. Niedermayer, A. D. Bianchi, R. Movshovich, E. D. Bauer, J. D. Thompson, and M. Kenzelmann (2004) Nat. Phys. 10: 126.
[3] Duk Y. Kim, et al., Phys. Rev. B 97, 245120 (2018)

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