TY - JOUR
T1 - High Tc
T2 - Top down or bottom up?
AU - Deutscher, Guy
AU - Dagan, Yoram
N1 - Funding Information:
This work was supported in part by the Heinrich Hertz Minerva Center for High Temperature Superconductivity and the Oren Family Chair for Experimental Solid State Physics.
PY - 2000
Y1 - 2000
N2 - We present and discuss recent tunneling results, which shed some light on the two contradicting approaches to the high-Tc problem. The "top-down" approach starts from the ansatz that the anomalous properties of the cuprates in their normal state above Tc need to be understood first, before the problem of superconductivity can be tackled successfully. On the other hand, in the "bottom-up" approach, both high Tc and the anomalous normal-state properties come about because of the vicinity of a quantum critical point. Our new tunneling results indicate that in the superconducting state, at some critical doping, the order parameter goes from a pure d-wave on the underdoped side to a complex one on the overdoped one. This symmetry breaking lends support to the hypothesis that there does exist a quantum critical point and, therefore, favors the "bottom-up" approach.
AB - We present and discuss recent tunneling results, which shed some light on the two contradicting approaches to the high-Tc problem. The "top-down" approach starts from the ansatz that the anomalous properties of the cuprates in their normal state above Tc need to be understood first, before the problem of superconductivity can be tackled successfully. On the other hand, in the "bottom-up" approach, both high Tc and the anomalous normal-state properties come about because of the vicinity of a quantum critical point. Our new tunneling results indicate that in the superconducting state, at some critical doping, the order parameter goes from a pure d-wave on the underdoped side to a complex one on the overdoped one. This symmetry breaking lends support to the hypothesis that there does exist a quantum critical point and, therefore, favors the "bottom-up" approach.
KW - High T
KW - Quantum critical point
KW - Tunneling
UR - http://www.scopus.com/inward/record.url?scp=0034291729&partnerID=8YFLogxK
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AN - SCOPUS:0034291729
SN - 1557-1939
VL - 13
SP - 699
EP - 701
JO - Journal of Superconductivity and Novel Magnetism
JF - Journal of Superconductivity and Novel Magnetism
IS - 5
ER -