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Volumn 75, Issue 9, 2007, Pages

In-plane and transverse superconducting fluctuation diamagnetism in the presence of charge-density waves in 2H-Nb Se2 single crystals

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EID: 34047192469     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.75.094509     Document Type: Article
Times cited : (18)

References (34)
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    • As near TC0, d TC d (μ0 H) ∼1 K T, these field amplitudes introduce a TC shift large enough to avoid the effect of TC inhomogeneities above TC0 (Ref.). This simple procedure could not be used by PBS due to the limitations of their magnetometer (Ref.).
    • As near TC0, d TC d (μ0 H) ∼1 K T, these field amplitudes introduce a TC shift large enough to avoid the effect of TC inhomogeneities above TC0 (Ref.). This simple procedure could not be used by PBS due to the limitations of their magnetometer (Ref.).
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    • The 0.6 mT field used in the measurements shifts the temperature at which the sample enters in the Meissner state T C1 (H), by ∼H (d H C1 dT) TC0 75 mK, where H C1 = H C2 ln κ 2 κ 2, is the lower critical magnetic field for Hab. This shift leads to a transition broadening of the same extent because between T C1 (H) and T C2 (H) TC0, the samples passes through the mixed state. This shift is more pronounced when Hab, due to the smaller lower critical field for this direction.
    • The 0.6 mT field used in the measurements shifts the temperature at which the sample enters in the Meissner state T C1 (H), by ∼H (d H C1 dT) TC0 75 mK, where H C1 = H C2 ln κ 2 κ2, is the lower critical magnetic field for Hab. This shift leads to a transition broadening of the same extent because between T C1 (H) and T C2 (H) TC0, the samples passes through the mixed state. This shift is more pronounced when Hab, due to the smaller lower critical field for this direction.
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    • It has been reported that the upper critical fields of 2H-Nb Se2 present a slightly positive curvature near TC0 (see, e.g., Ref.). In fact, our H c2, (T) curves extrapolate linearly to a temperature somewhat below TC0. This effect, which is characteristic of anisotropic LTSC's, has been explained in terms of the combined effect of the gap anisotropy and nonlocality [see, e.g., D. W. Youngner and R. A. Klemm, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.21.3890 21, 3890 (1980), and references therein].
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