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APS » Journals » Phys. Rev. Lett. » Volume 99 » Issue 14
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Phys. Rev. Lett. 99, 147008 (2007) [4 pages]

Observation of Competing Order in a High-Tc Superconductor Using Femtosecond Optical Pulses

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Elbert E. M. Chia, Jian-Xin Zhu, D. Talbayev, R. D. Averitt*, and A. J. Taylor
MPA-CINT and T-11, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Kyu-Hwan Oh, In-Sun Jo, and S.-I. Lee†
National Creative Research Initiative Center for Superconductivity and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea

Received 11 May 2007; published 5 October 2007

We present studies of the photoexcited quasiparticle dynamics in Tl2Ba2Ca2Cu3Oy (Tl-2223) using femtosecond optical techniques. Deep into the superconducting state (below 40 K), a dramatic change occurs in the temporal dynamics associated with photoexcited quasiparticles rejoining the condensate. This is suggestive of entry into a coexistence phase which, as our analysis reveals, opens a gap in the density of states (in addition to the superconducting gap), and furthermore, competes with superconductivity resulting in a depression of the superconducting gap.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.147008
DOI:
10.1103/PhysRevLett.99.147008
PACS:
74.72.Jt, 73.50.Gr, 74.25.Ha, 78.47.+p

*Present address: Department of Physics, Boston University, Boston, MA 02215, USA.

†Present address: Quantum Materials Research Laboratory, Korea Basic Science Institute, Daejeon 305-333, Republic of Korea.

 
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