Intrinsic quantum melting of a driven vortex lattice in amorphous<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Mo</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>Ge</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>films

Okuma, S.; Imaizumi, Hiroyuki; Kokubo, N.

doi:10.1103/physrevb.80.132503

Cited by 17 publications

(7 citation statements)

References 27 publications

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“…The mean-field transition temperature T c0 defined by a 95% criterion of the normal-state resistivity [30], ρ(T c0 ) = 0.95ρ n , and the zero-resistivity temperature T c are 6.1 and 6.0 K, respectively. A good homogeneity of the sample was confirmed, e.g., from a relatively sharp resistive transition as a function of temperature T and field B down to below 0.1 K [28,29] and from a sharp structural transition of vortex matter (the order-disorder transition) at the peak-effect regime [27] (see below). Furthermore, the reproducibility of the vortex states for different samples prepared independently was also confirmed (see, e.g., [27]).…”

Section: Methodsmentioning

confidence: 78%

“…This is due to the effect of T resulting from Joule heating by increased I. Thus, from the decreased value of R(I) at each T and from a R(T) curve for small I, we can estimate T for given I (dissipation) and T [28]. All the data presented in this paper were measured with I giving rise to T < 0.01 K.…”

Section: Methodsmentioning

confidence: 95%

“…The a-Mo x Ge 1−x film with thickness of 330 nm was prepared by rf sputtering on a Si substrate held at room temperature [27][28][29]. The film contains random point-like pinning centers.…”

Section: Methodsmentioning

confidence: 99%

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Scaling analysis on plastic depinning of vortex matter at low temperature in an amorphous Mo_xGe_1−xfilm

Okuma

Motohashi

Kawamura³

2013

Supercond. Sci. Technol.

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We measure current-voltage (I-V) characteristics in a weakly disordered vortex-lattice phase of an amorphous Mo x Ge 1−x film at various temperatures T down to near T = 0 and perform a scaling analysis using recent simulations for a plastic depinning transition where a continuous velocity-force response is predicted. The collapse of the I-V data onto a scaling function is observed, whereas critical exponents derived via the scaling analysis are larger than the predicted ones. This discrepancy is partially attributed to the unexpectedly weak T dependence of the I-V characteristics at low T.

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Section: Methodsmentioning

confidence: 78%

Section: Methodsmentioning

confidence: 95%

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Scaling analysis on plastic depinning of vortex matter at low temperature in an amorphous Mo_xGe_1−xfilm

Okuma

Motohashi

Kawamura³

2013

Supercond. Sci. Technol.

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“…By applying a transport current, they are driven and generate voltage. Using a mode-locking (ML) technique [1][2][3][4][5][6][7][8], in which the vortex lattice is driven fast by superimposed dc (I) and ac currents (I r f ), we have recently found the rearrangement (rotation) of the lattice orientation from the perpendicular to parallel orientation [9] induced by dc and/or ac velocity [10]. This phenomenon is considered to be a new type of dynamic transition caused by increased velocity.…”

Section: Introductionmentioning

confidence: 99%

Rearrangement of the Fast Driven Abrikosov Lattice in a Superconducting Amorphous Film in Tilted Field

Kamimura¹,

Nagatani²,

Okuma

2014

Proceedings of the International Symposium on Science Explored by Ultra Slow Muon (USM2013)

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We perform mode-locking (ML) measurements in a tilted magnetic field, where the distorted Abrikosov lattice is driven fast by superimposed dc and ac currents. By increasing the amplitude of the ac velocity v ac , we examine the change in the lattice orientation as a function of the effective velocity v e . When the vortex lattice is expanded in the flow direction, v e -induced reorientation from perpendicular to parallel occurs at small v e . By contrast, when the moving lattice is expanded perpendicularly to the flow direction, only the perpendicular orientation is observed. The results are qualitatively consistent with recent ML measurements with small v ac , in which the dc-velocity and tilt-angle induced reorientation was studied [N. Kokubo, T. Yoshimura, and B. Shinozaki: J. Phys. Soc. Jpn. 82 (2013) 094702].

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“…Recently, Okuma et al 21 studied the order-disorder transition ͑ODT͒ of driven vortex matter in amorphous MoGe films near the PE regime of critical current. Quite recently, Okuma et al [24][25][26][27] studied the dynamic melting of a driven vortex lattice in disordered ␣-Mo x Ge 1−x films down to near-zero temperature using the mode-locking technique. These results suggested the existence of the ODT and vortex instabilities due to coexisting vortex phases around B p .…”

Section: Introductionmentioning

confidence: 99%

Peak effect and dynamic melting transitions of driven vortex system in weakly disordered Josephson junction arrays

Xing

Liu

2010

Journal of Applied Physics

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Using the resistively shunted junction model, we study the magnetic frustration induced dynamic melting transitions of a current-driven vortex system in two-dimensional weakly disordered Josephson juction arrays at zero temperature and very low temperatures. From the unified model simulations, we simultaneously obtain two kinds of dynamic melting transitions of the vortex flow, just below the vortex glass phase and above a dynamic melting threshold, respectively. The reenter pinned dilute vortex liquid behavior and the intrinsic quantum vortex liquid ͑QVL͒ phenomenon are also obtained, consistent with the recent experimental reports in disordered and superconducting MoGe films. The peak effect of critical current in the vortex glass is induced by intrinsic collective pinning effects in the plastic flow and the enhancement of critical current and voltage noise in the QVL phase arises from intrinsic quantum fluctuations in the moving vortex flow.

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Intrinsic quantum melting of a driven vortex lattice in amorphousMoxGe1−xfilms

Cited by 17 publications

References 27 publications

Scaling analysis on plastic depinning of vortex matter at low temperature in an amorphous Mo_xGe_1−xfilm

Scaling analysis on plastic depinning of vortex matter at low temperature in an amorphous Mo_xGe_1−xfilm

Rearrangement of the Fast Driven Abrikosov Lattice in a Superconducting Amorphous Film in Tilted Field

Peak effect and dynamic melting transitions of driven vortex system in weakly disordered Josephson junction arrays

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Intrinsic quantum melting of a driven vortex lattice in amorphousMoxGe1−xfilms

Cited by 17 publications

References 27 publications

Scaling analysis on plastic depinning of vortex matter at low temperature in an amorphous MoxGe1−xfilm

Scaling analysis on plastic depinning of vortex matter at low temperature in an amorphous MoxGe1−xfilm

Rearrangement of the Fast Driven Abrikosov Lattice in a Superconducting Amorphous Film in Tilted Field

Peak effect and dynamic melting transitions of driven vortex system in weakly disordered Josephson junction arrays

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Scaling analysis on plastic depinning of vortex matter at low temperature in an amorphous Mo_xGe_1−xfilm

Scaling analysis on plastic depinning of vortex matter at low temperature in an amorphous Mo_xGe_1−xfilm