Extended quasiparticle states outside the vortex cores in a d-wave superconductor

Guo Qing Zheng

doi:10.1142/s0217979203021307

Extended quasiparticle states outside the vortex cores in a d-wave superconductor

Research output: Contribution to journal › Article › peer-review

Abstract

We a describe a measurement of the spin Knight shift (K_s) around the middle point between two vortices as a function of magnetic field (H) up to 28 T in a high-T_c superconductor TlSr₂CaCu ₂O_6.8. At low temperatures, K_s increases substantially with increasing field, which indicates that the quasiparticle states with an ungapped spectrum are extended outside the vortex cores in a d-wave superconductor. The density of such states is found to be ∼0.7N ₀√H/H_c2, with No being the normal-state density of states and H_c2 being the upper critical field.

Original language	English
Pages (from-to)	3509-3512
Number of pages	4
Journal	International Journal of Modern Physics B
Volume	17
Issue number	18-20 II
DOIs	https://doi.org/10.1142/s0217979203021307
Publication status	Published - Aug 10 2003
Externally published	Yes

Keywords

D-wave superconductor
NMR
Quasiparticle state
Vortex

ASJC Scopus subject areas

Statistical and Nonlinear Physics
Condensed Matter Physics

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10.1142/s0217979203021307

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abstract = "We a describe a measurement of the spin Knight shift (Ks) around the middle point between two vortices as a function of magnetic field (H) up to 28 T in a high-Tc superconductor TlSr2CaCu 2O6.8. At low temperatures, Ks increases substantially with increasing field, which indicates that the quasiparticle states with an ungapped spectrum are extended outside the vortex cores in a d-wave superconductor. The density of such states is found to be ∼0.7N 0√H/Hc2, with No being the normal-state density of states and Hc2 being the upper critical field.",

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N2 - We a describe a measurement of the spin Knight shift (Ks) around the middle point between two vortices as a function of magnetic field (H) up to 28 T in a high-Tc superconductor TlSr2CaCu 2O6.8. At low temperatures, Ks increases substantially with increasing field, which indicates that the quasiparticle states with an ungapped spectrum are extended outside the vortex cores in a d-wave superconductor. The density of such states is found to be ∼0.7N 0√H/Hc2, with No being the normal-state density of states and Hc2 being the upper critical field.

AB - We a describe a measurement of the spin Knight shift (Ks) around the middle point between two vortices as a function of magnetic field (H) up to 28 T in a high-Tc superconductor TlSr2CaCu 2O6.8. At low temperatures, Ks increases substantially with increasing field, which indicates that the quasiparticle states with an ungapped spectrum are extended outside the vortex cores in a d-wave superconductor. The density of such states is found to be ∼0.7N 0√H/Hc2, with No being the normal-state density of states and Hc2 being the upper critical field.

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Extended quasiparticle states outside the vortex cores in a d-wave superconductor

Abstract

Keywords

ASJC Scopus subject areas

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