Harris, Ong, and Yan Reply:

Jm, Harris; Ong, N. P.; Yf, Yan

doi:10.1103/physrevlett.74.2839

Cited by 38 publications

(59 citation statements)

References 8 publications

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“…However, the thermopower exhibits a significant anisotropy, showing not only quantitative differences, but also a general distinction in temperature dependences and even opposite signs of in-plane and out-of-plane TEP values, as was reported for nearly optimally doped Y-Ba-Cu-O. 2,3 Such unusual anisotropy was also observed in Hall-effect experiments for Y-Ba-Cu-O, 2,4 where both changes in sign and in general temperature characteristics for ab and c directions were observed. Despite the crucial influence of doping on high-temperature superconductivity, up to now the in-plane vs out-of-plane anisotropy of both the Seebeck and Hall effects has been reported in literature only for nearly optimally doped samples.…”

Section: Introductionsupporting

confidence: 69%

Thermopower anisotropy of highly underdoped and slightly overdopedRBa2Cu3O

1998

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The thermoelectric power (S) for a series of RBa 2 Cu 3 O 7Ϫ␦ (RϭY, Gd, Dy) single crystals were measured in the ab plane and along the c direction. The doping level of these crystals changes from highly underdoped (T c ϭ44 K), through optimally doped (T c ϭ90 K) to slightly overdoped (T c ϭ88 K). Both S ab and S c change linearly with the doping level, but S ab reverses its sign near the optimal doping stoichiometry, as it was observed for polycrystalline materials, whereas S c remains positive for the whole series. In contrast to the results of electrical resistivity, the anisotropy of S was found to decrease with both increasing oxygen deficiency and decreasing temperature. A brief overview of thermopower results for single crystals of various high-temperature superconducting families is also presented. ͓S0163-1829͑98͒06102-5͔

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Section: Introductionsupporting

confidence: 69%

Thermopower anisotropy of highly underdoped and slightly overdopedRBa2Cu3O

1998

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“…In conventional metals the Hall coe cient is actually a good measure for the carrier density and does not show strong temperature dependence. However, for high-T c cuprates, it shows a remarkable temperature dependence like the Curie± Weiss behaviours of the magnetic susceptibility, see ® gure 4 [59]. Its value at low temperatures is strongly enhanced from the conventional results.…”

Section: Brief Summary Of Experimental Resultsmentioning

confidence: 88%

Spin fluctuations and high temperature superconductivity

Moriya

Ueda

2000

Advances in Physics

380

349

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Theory of spin¯uctuations for itinerant magnetism and its application to high temperature superconductivity are reviewed. After a brief introduction to the whole subject the developments of the self-consistent renormalization theory of spin¯uctuations are summarized with particular emphasis on critical properties at the quantum phase transitions. Most of the anomalous properties in the normal state of high-T c cuprates are understood as due to the critical behaviours for the two dimensional antiferromagnetic metals. By analysing the nuclear magnetic relaxation rate and the T -linear term of resistivity, the set of parameters to specify the spin¯uctuations are determined. It is shown that by using the parameters thus obtained one can describe other quantities as well, e.g. optical conductivity. Then we proceed to the theory of superconductivity by the spin¯uctuation mechanism. After some discussion on the weak coupling treatments, the strong coupling theory is reviewed. It is shown that the set of parameters determined by the normal state properties of the high-T c cuprates just give a transition temperature of the right order of magnitude. Among the parameters, the most sensitive one for T c is the frequency spread of the spin¯uctuations. This fact enables us to present a possible uni® ed picture of the antiferromagnetic spin¯uctuation-induced superconductors, including heavy fermion superconductors and organic superconductors. This point of view may be con® rmed to a certain extent by microscopic calculations based on the¯uctuation exchange approximation for the two-dimensional Hubbard models representing not only the cuprates but also organic and trellis lattice compounds. The review is concluded with some discussions on future problems, e.g. the pseudo spin-gap in the under-doped region.

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“…The close-packed direction of the moving lattice is oriented along the direction of motion. A reorientation of a moving vortex lattice was observed in early experiments [13] and, more recently, in YBCO [14]. A mechanism for the reorientation in the presence of bulk pinning was proposed in the context of collective pinning theory in [15].…”

Section: Intermediate Transport Currentmentioning

confidence: 95%