ISSN:
1572-9605
Keywords:
High T c
;
tunneling
;
quantum critical point
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract We present and discuss recent tunneling results, which shed some light on the two contradicting approaches to the high-T c problem. The “top-down” approach starts from the ansatz that the anomalous properties of the cuprates in their normal state above T c 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 T c 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1007845610995
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