Pinning Strength Dependence of Mixed-State Hall Effect in YB<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">a</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>C<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">u</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mat

Wn, Kang; Kim, Do-Hyung; Sy, Shim; Park, J-H; Ts, Hahn; Ss, Choi; Wc, Lee; Jd, Hettinger; Gray, K. E.; Glagola, B. G.

doi:10.1103/physrevlett.76.2993

Cited by 67 publications

(38 citation statements)

References 20 publications

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“…34,48 Controversial experimental results have been reported on the influence of disorder on the mixed-state Hall effect. For irradiated YBCO samples, β was found to be 1.5 ± 0.1 compared to 2 ± 0.2 for unirradiated ones, 49 in accordance with WDT (see also Refs. [26][27][28].…”

Section: Regimesmentioning

confidence: 54%

Hall effect inLuNi2B2Cand<

et al. 1999

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The Hall effect in LuNi2B2C and YNi2B2C borocarbides has been investigated in normal and superconducting mixed states. The Hall resistivity ρxy for both compounds is negative in the normal as well as in the mixed state and has no sign reversal below Tc typical for high-Tc superconductors. In the mixed state the behavior of both systems is quite similar. The scaling relation ρxy ∼ ρ β xx (ρxx is the longitudinal resistivity) was found with β = 2.0 and 2.1 for annealed Luand Y-based compounds, respectively. The scaling exponent β decreases with increasing degree of disorder and can be varied by annealing. This is attributed to a variation of the strength of flux pinning. In the normal state weakly temperature dependent Hall coefficients were observed for both compounds. A distinct nonlinearity in the ρxy dependence on field H was found for LuNi2B2C in the normal state below 40 K, accompanied by a large magnetoresistance (MR) reaching +90% for H = 160 kOe at T = 20 K. At the same time for YNi2B2C only linear ρxy(H) dependences were observed in the normal state with an approximately three times lower MR value. This difference in the normal state behavior of the very similar Lu-and Y-based borocarbides seems to be connected with the difference in the topology of the Fermi surface of these compounds.

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Section: Regimesmentioning

confidence: 54%

Hall effect inLuNi2B2Cand<

et al. 1999

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“…Unlike cuprate superconductors exhibiting 1.0 < β < 2.0, [22,23,25,26] the sign of ρ xy in this study does not reverse in either the T or the H sweep results. Wang's theory [32] predicts that the scaling behavior exhibiting β < 2.0 occurs after a sign reversal, which is inconsistent with the present results.…”

Section: This Model Explains Well the Observation That The (T H) Vamentioning

confidence: 67%

“…The above behavior for a Ba(Fe 1-x Co x ) 2 As 2 film, in which a small and constant β is maintained under various magnetic fields, is generally reported for superconductors with strong pinning centers such as twinned YBCO epitaxial films, [22] irradiated YBCO single crystals, [25] and irradiated Tl 2 Ba 2 CaCu 2 O 8 films. [23,40] Unlike the T sweep results (Fig.…”

Section: (B)]mentioning

confidence: 99%

“…In fact, the β values of most cuprate superconductors exhibiting strong pinning are 1.0-1.8, which are considerably less than 2.0. [22,23,25,26] Based on the Wang's theory, [32] our experimental results with β = 1.7-1.82 indicate that strong pinning centers effectively work for the T sweep in the entire H region examined in this study. The strong pinning centers are also effective for the H sweep only in the low T (< 14 K) region, but the pinning strength rapidly weakens as T increases and approaches T c .…”

Section: (B)]mentioning

confidence: 99%

“…The behavior of the β value has actively been discussed in relation to the superconducting and vortex pinning mechanisms. [22][23][24][25][26][27] Although sign reversal of ρ xy has been observed, its origin remains controversial. [28][29][30] Vinokur et al [31] considered the momentum balance and proposed a model where a system of interacting vortices under quenched disorders and thermal noises follows a universal scaling law with a universal β = 2.0.…”

Section: Introductionmentioning

confidence: 99%

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Anomalous scaling behavior in a mixed-state Hall effect of a cobalt-doped BaFe2As2epitaxial film with a high critical current density over 1 MA/cm
Sato
¹
,
Katase
²
,
Kang
³

et al. 2013
Phys. Rev. B
17
1
7
0
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The mixed-state Hall effect was examined in a Ba(Fe 1-x Co x ) 2 As 2 epitaxial film with a high critical current density. The transverse resistivity ρ xy and the longitudinal resistivity ρ xx follow power law scaling ρ xy = Aρ xx β . In the temperature-sweep with a fixed field (T sweep), all of the β values are independent of magnetic field up to 9 T, and are lower than 2.0 (around 1.8). In contrast, the β values in the magnetic-field sweep with a fixed temperature (H sweep) change from 1.8 to 2.0 as the temperature increases from 13 to 16 K even in the T/H region that overlaps with the T sweep measurements. These results indicate that the vortices introduced at low temperatures are trapped by strong pinning centers, but a portion of the vortices introduced at high temperatures are not strongly trapped by the pinning centers. The sign of ρ xy is negative, and a sign reversal is not detected. These distinct scaling behaviors, which sharply contrast cuprates and MgB 2 , are explained by high-density c-axis pinning centers in the Ba(Fe 1-x Co x ) 2 As 2 epitaxial film and are consistent with a wider vortex liquid phase. H. Sato et al. 3

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