Universal critical scaling of dc and ac complex resistivities in an indium film near the vortex-glass transition

Okuma, S.; Kokubo, N.

doi:10.1103/physrevb.56.14138

Cited by 28 publications

(10 citation statements)

References 41 publications

(29 reference statements)

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“…34 Also, the "zero-field" measurement was performed using a double-wall -metal shielded dewer. The I -V characteristics, frequency ͑f͒-dependent linear ac complex resistivity ͑f = 75 kHz-3 MHz͒, [23][24][25] and the excess voltage noise spectral density S V ͑f͒ ͑f = 1 Hz-100 kHz͒ 32,33 were measured by the four-terminal method. The voltage noise enhanced with a preamplifier was analyzed with a fast-Fourier transform spectrum analyzer.…”

Section: Methodsmentioning

confidence: 99%

“…[23][24][25][26][27][28][29] In particular, the vortex state in the low-H regime, 7,15,16,30 as well as the low-T/high-H regime, remains still unrevealed, which is the subject of this paper. In the uniformly disordered superconductors which we focus on in the present paper the complicated edge-contamination mechanism is much less effective (or negligible) 12 and, hence, the dynamic as well as the static vortex state is expected to be much simpler.…”

Section: Introductionmentioning

confidence: 99%

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Vortex dynamics and possible vortex states just below the vortex-glass phase

Okuma

Kamada

2004

Phys. Rev. B

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We have measured current-induced voltage noise S V of thick amorphous Mo x Si 1−x films in various fields H from zero to high fields near the vortex-glass (VG) transition H g . Irrespective of temperature T, S V is highest in the Meissner phase ͑H Ͻ H c1 ͒. With applying H that exceeds H c1 , S V decreases abruptly and falls to the background level. With further increasing H, S V then starts to rise at characteristic field H Lg 0 ͑ӶH g ͒ and the broad peak resulting from a plastic-flow motion of VG occurs before H g is approached. Combined with the S V data for the Corbino disk, we suggest that the edge-contamination effects reported in the clean NbSe 2 single crystals are not important in our disordered films. Within the T range studied, H Lg 0 ͑T͒ shows an increase on cooling, which is different from the T-independent disorder-driven transition. We interpret the field regime H c1 ͑T͒ Ͻ H͑T͒ Ͻ H Lg 0 ͑T͒ as the vortex state different from the VG phase.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vortex dynamics and possible vortex states just below the vortex-glass phase

Okuma

Kamada

2004

Phys. Rev. B

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“…The existence of vortices in the mixed state of a superconductor is one of the most fascinating research topics in superconducting physics12345678910111213141516. The vortices can form liquid, crystalline, and glassy phases.…”

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confidence: 99%

“…This transition has been demonstrated by transport measurement in HTS systems like YBa 2 Cu 3 O 7 (YBCO)13, Pr 2-x Ce x CuO 4-y (PCCO)7 and Bi 2 Sr 2-x La x CuO 6 + δ (BSLCO)46. However, VG transition-like behavior in conventional low critical temperature superconductors (LTS) has only been observed in very few systems, like Nb8910, In11, and Mo 3 Si13 films.…”

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confidence: 99%

Voltage-current properties of superconducting amorphous tungsten nanostrips

Sun

Wang

Zhao

et al. 2013

Sci Rep

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The voltage-current (V-I) characteristics of tungsten (W) strips patterned by focused-ion-beam assisted deposition were studied at different temperatures and various magnetic fields applied perpendicular to the strips. At fields of 1 Tesla (T) and 2 T, a scaling behavior was observed in V-I isotherms, which can be fitted by quasi-three-dimensional (quasi-3D) vortex-glass (VG) to liquid transition theory.

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“…The phenomenology of vortex phases is especially rich in the case of high critical temperature superconductors ͑HTCS͒, 1 because of the larger anisotropy and thermal fluctuations. Nevertheless, different vortex phases have also been observed in low critical temperature superconductors ͑LTCS͒, including vortex liquid and different vortex solid phases ͑as the vortex-glass [2][3][4] or the novel Bragg-glass 5,6 ͒. Disorder plays a crucial role in determining which of those phases is stabilized.…”

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confidence: 99%

Vortex phases in superconducting Nb thin films with periodic pinning

et al. 2005

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Magnetotransport properties have been used to investigate vortex phases in Nb films with periodic arrays of magnetic pinning centers. This kind of samples show a continuous glass transition similar to that observed in Nb plain films, but the periodic pinning yields different critical exponents and enhanced glass transition temperature at the matching field. DOI: 10.1103/PhysRevB.72.174512 PACS number͑s͒: 74.78.Ϫw, 74.25.Dw, 74.25.Qt Phase transitions in vortex matter is one of the most interesting research topics, as shown by the flood of papers published during recent years. The phenomenology of vortex phases is especially rich in the case of high critical temperature superconductors ͑HTCS͒, 1 because of the larger anisotropy and thermal fluctuations. Nevertheless, different vortex phases have also been observed in low critical temperature superconductors ͑LTCS͒, including vortex liquid and different vortex solid phases ͑as the vortex-glass 2-4 or the novel Bragg-glass 5,6 ͒. Disorder plays a crucial role in determining which of those phases is stabilized. While materials with weak or no disorder exhibit an Abrikosov vortex-lattice with long-range topological order, random pinning or thermal fluctuations stabilize a Bragg-glass phase with quasi-longrange topological order. 5 The statics of vortex-lattices has been extensively investigated and it is known that a Braggglass undergoes a transition into a disordered vortex-glass 2 or a pinned liquid upon increase of disorder or field, 5 while a different Bose-glass 7,8 may develop in the presence of columnar defects. In Nb single crystals, small angle neutron data have indicated Bragg-glass melting ͑disordering͒.6 In Nb thin films, on the other hand, the logarithmic time decay of the remanent magnetization below the irreversibility line suggested a melting transition of the vortex-lattice, 9 while the negative curvature at low currents of E-J isotherms 10 or their scaling behavior 4 have been discussed to point to the existence of a glass transition. Furthermore aging and memory effects, characteristic of glassy dynamics, have been recently reported by Sun et al. in Nb films covered by a disordered array of magnetic nanoparticles.11 Despite the static properties of the vortex-lattice being largely investigated an open question is how moving lattices ͑for example under the action of a driving current͒ will behave, and how the glassy properties of the static system will be affected by lattice motion. It has been argued that at large vortex velocities disorder would produce little effect since the pinning force on a single vortex varies rapidly.12 On the other hand Giamarchi et al. 13 favor the picture of a moving glass, i.e., glassy properties remain in moving lattices.Most of the experimental studies so far have considered the effect of random disorder. Nanolithography techniques allow fabricating ordered arrays of pinning centers, 14 so that the interaction of vortices with an in-plane periodic distribution of defects can be studied. Such interaction yields dra...

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Universal critical scaling of dc and ac complex resistivities in an indium film near the vortex-glass transition

Cited by 28 publications

References 41 publications

Vortex dynamics and possible vortex states just below the vortex-glass phase

Vortex dynamics and possible vortex states just below the vortex-glass phase

Voltage-current properties of superconducting amorphous tungsten nanostrips

Vortex phases in superconducting Nb thin films with periodic pinning

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