Trunin MR, Nefyodov YA, Shevchun AF. Superfluid density in the underdoped YBa2Cu3O7-x: evidence for d-density-wave order of the pseudogap.
PHYSICAL REVIEW LETTERS 2004;
92:067006. [PMID:
14995267 DOI:
10.1103/physrevlett.92.067006]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2003] [Indexed: 05/24/2023]
Abstract
The investigation of the penetration depth lambda(ab)(T,p) in YBa2Cu3O7-x crystals allowed one to observe the following features of the superfluid density n(s)(T,p) proportional, variant lambda(-2)(ab)(T,p) as a function of temperature T<T(c)/2 and carrier concentration 0.078< or p < or = 0.16 in CuO2 planes: (i) n(s)(0,p) depends linearly on p; (ii) the derivative absolute value of dn(s)(T,p)/dT (T-->0) depends on p slightly in the optimally and moderately doped regions (0.10<p< or =0.16), however, it rapidly increases with p further lowering; (iii) the latter finding is accompanied by the linear low-temperature dependence [-Delta n(s)(T)] proportional, variant T changing to [-Delta n(s)(T)] proportional, square root of T. All these peculiarities can be treated in the framework of the d-density-wave scenario of electronic processes in underdoped high-T(c) materials.
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