Electronic Raman Spectroscopy in a Nut Shell (I) Yu He SC Meeting Oct 10, 2013 Raman and History Experimental Setup Geometry in Raman Position Raman among.

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Presentation transcript:

Electronic Raman Spectroscopy in a Nut Shell (I) Yu He SC Meeting Oct 10, 2013 Raman and History Experimental Setup Geometry in Raman Position Raman among other Techniques Raman in Superconducting Materials Mode coupling SC Gap Main conclusion figures

Electronic Raman Spectroscopy in a Nut Shell (I) Raman and History Experimental Setup Geometry in Raman Position Raman among other Techniques Raman in Superconducting Materials Mode coupling SC Gap Main conclusion figures

Raman at First Glance

Very Frist Raman by Raman

Milestones to Modern Raman

Electronic Raman Spectroscopy Resonant Inelastic X-ray Scattering Molecules (gas and liquid) Solid (electronic) From Molecules to Solid

Electronic Raman Spectroscopy in a Nut Shell (I) Yu He SC Meeting Oct 10, 2013 Raman and History Experimental Setup Geometry in Raman Position Raman among other Techniques Raman in Superconducting Materials Mode coupling SC Gap Main conclusion figures

Backscattering Raman Two-gap dichotomy is NOT universal (in UD regime) electro-optic modulator (EOM)

Geometry in Raman

Fig. 2 to rebut the gap-dichotomy picture

Electronic Raman Spectroscopy in a Nut Shell (I) Yu He SC Meeting Oct 10, 2013 Raman and History Experimental Setup Geometry in Raman Position Raman among other Techniques Raman in Superconducting Materials Mode coupling SC Gap Main conclusion figures

e-ph: Migdal Coulomb: FL, MFL e-magnon Single Particle vs Two Particles

Electronic Conductivity

IR Spectroscopy

Electronic Raman Spectroscopy in a Nut Shell (I) Yu He SC Meeting Oct 10, 2013 Raman and History Experimental Setup Geometry in Raman Position Raman among other Techniques Raman in (Superconducting) Materials Mode coupling SC Gap Main conclusion figures

Start from single metal? Not so easy! Strong screening – small interaction volume Parabolic dispersion and spherical FS – further reduce cross section

Nb 3 Sn 40K 1.8K V 3 Si ‘HighTc’ Convenional SC

Tc ~ 7.2K, Tcdw ~33K, Hc2 ~42kG Competition and Mode Coupling

Mode description

No dichotomy when QP is well defined across all fermi surface Dichotomy appears when QP disappears from N to AN Highc SC

Bi2212

Highc SC

M. Le Tacon et al., Nat. Phys. 2, 537 (2006) Highc SC

Bi Highc SC

Two magnon excitations Highc SC

FT- RamanRIXS

The END