APS March Meeting 2012
Volume 57, Number 1
Monday–Friday, February 27–March 2 2012;
Boston, Massachusetts
Session L3: Invited Session: Fermiology of Electron and Hole Doped Cuprates - A Guide to High Temperature Superconductivity
2:30 PM–5:30 PM,
Tuesday, February 28, 2012
Room: 205AB
Sponsoring
Unit:
DCMP
Chair: Suchitra Sebastian, University of Cambridge
Abstract ID: BAPS.2012.MAR.L3.3
Abstract: L3.00003 : Phase competition in trisected superconducting dome
3:42 PM–4:18 PM
Preview Abstract
Abstract
Author:
Inna Vishik
(Stanford University)
The momentum-resolved nature of angle-resolved photoemission spectroscopy
(ARPES) has made it a key probe of emergent phases in the cuprates, such as
superconductivity and the pseudogap, which have anisotropic momentum-space
structure. ARPES can be used to infer the origin of spectral gaps from their
distinct phenomenology---temperature, doping, and momentum dependence, and
this principle has been used to argue that the pseudogap is a distinct phase
from superconductivity, rather than a precursor [1]. We have studied
Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta }$ (Bi-2212) using laser-ARPES, and
our data give evidence for three distinct quantum phases comprising the
superconducting ground state, accompanied by abrupt changes at p$\sim $0.076
and p$\sim $0.19 in the doping-and-temperature dependence of the gaps near
the bond-diagonal (nodal) direction [2]. The latter doping likely marks the
quantum critical point of the pseudogap, while the former represents a
distinct competing phase at the edge of the superconducting dome.
Additionally, we find that the pseudogap advances closer towards the node
when superconductivity is weak, just below T$_{c}$ or at low doping, and
retreats towards the antinode well below T$_{c}$ and at higher doping. This
phase competition picture together with the two critical doping are
synthesized into our proposed phase diagram, which also reconciles
conflicting phase diagrams commonly used in the field. Our results
underscore the importance of quantum critical phenomena to cuprate
superconductivity, provide a microscopic picture of phase competition in
momentum space, and predict the existence of phase boundaries inside the
superconducting dome which are different from simple extrapolations from
outside the dome.
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[1] I. M. Vishik, W. S. Lee, R.-H. He, M. Hashimoto, Z. Hussain, T. P.
Devereaux, and Z.-X. Shen. \textit{New J. Phys. }\textbf{12}, 105008 (2010).
\\[0pt]
[2] I. M. Vishik, M. Hashimoto, R.-H. He, W. S. Lee, F. Schmitt, D. H. Lu,
R.G. Moore, C. Zhang, W. Meevasana, T. Sasagawa, S. Uchida, K. Fujita, S.
Ishida, M. Ishikado, Y. Yoshida, H. Eisaki, Z. Hussain, T. P. Devereaux, and
Z.-X. Shen, \textit{Submitted} (2011).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.L3.3