Sum rules and interlayer infrared response of the high temperature YBa2Cu3Oy superconductor in an external magnetic field |
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| Authors: | LaForge A D Padilla W J Burch K S Li Z Q Schafgans A A Segawa Kouji Ando Yoichi Basov D N |
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| Affiliation: | Department of Physics, University of California, San Diego, La Jolla, California 92093, USA. alaforge@physics.ucsd.edu |
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| Abstract: | We present infrared magneto-optical measurements of the c-axis conductivity of YBa2Cu3Oy in both the underdoped (y=6.67 and 6.75) and optimally doped (y=6.95) regimes. We show that modest c-axis magnetic fields radically modify the condensate formation and restore conventional BCS-like energetics. Additionally, we demonstrate the pivotal role of interplane coherence in the anomalous high-energy contribution to the superfluid density. |
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