Fabrication of Bi2212 cross-whiskers junction

Takano, Yoshihiko; Hatano, Takeshi; Ishii, Akira; Fukuyo, Akihiro; Sato, Yoshihiro; Arisawa, Shunichi; Togano, K.

doi:10.1016/s0921-4534(01)00683-9

Cited by 16 publications

(12 citation statements)

References 10 publications

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“…[1][2][3][4][5][6][7][8][9][10] It was claimed that the tricrystal experiment demonstrated a dominant d x 2 Ϫy 2-wave OP component in Bi2212 at low temperature T for both underdoped and overdoped samples. 1 However, the Pb/Bi2212 c-axis Josephson junction experiments demonstrated in many samples that at least a small s-wave component was present for T below the T c of Pb ͑or Nb͒.…”

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confidence: 99%

“…18 Recently, Takano et al crossed two single crystal Bi2212 whiskers an angle 0 about the c axis and fused them together, 7,8 using a technique similar to that of Li et al 4 In addition to the nominal composition of overdoped Bi2212, with T c Ϸ80 K, such whiskers usually have a second transition at T c2 Ϸ105 K, due to Bi 2 Sr 2 Ca 2 Cu 3 O 10ϩ␦ ͑Bi2223͒ contamination. 6,9 For a 90°cross-whisker junction, a HR-TEM picture revealed that this junction was uniform over 100 nm, but the expected periodic lattice distortion was difficult to discern. 9 No HRTEM pictures of other cross-whisker junctions were made.…”

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Theory ofBi2Sr2CaCu2

Klemm

2003

Phys. Rev. B

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Takano et al. ͓Phys. Rev. B 65, 140513 ͑2002͒; J. Low Temp. Phys. 131, 533 ͑2003͔͒ made Josephson junctions from single crystal whiskers of Bi 2 Sr 2 CaCu 2 O 8ϩ␦ crossed an angle 0 about the c axis. From the mesa structures that formed at the cross-whisker interface, they inferred a critical current density J c ( 0 ). As with the single crystal results of Li et al. ͓Phys. Rev. Lett. 83, 4160 ͑1999͔͒, we show that the whisker data are unlikely to result from a predominantly d-wave order parameter. However, unlike the single crystals, these results, if correct, require the whisker c-axis transport to be coherent.

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Theory ofBi2Sr2CaCu2

Klemm

2003

Phys. Rev. B

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“…Because the widths of the whiskers ranged from 10 to 30 µm, the junction area was two orders of magnitude smaller than that of their twist junctions [7]. The multiple-branch structures observed in the current-voltage (I-V) characteristic of the cross-whiskers junction are a feature of the intrinsic Josephson effect [11,12]. In this letter, a d-like pairing symmetry of the critical current density along with the intrinsic Josephson properties is presented using cross-whiskers junctions.…”

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d-like symmetry of the order parameter and intrinsic Josephson effects inBi2Sr2CaCu<

et al. 2002

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An intrinsic tunnel junction was made using two Bi-2212 single crystal whiskers. The two whiskers with a cross-angle were overlaid at their c-planes and connected by annealing. The angular dependence of the critical current density along the c-axis is of the d-wave symmetry.However, the angular dependence is much stronger than that of the conventional d-wave. Furthermore, the current vs. voltage characteristics of the cross-whiskers junctions show a multiple-branch structure at any cross-angle, indicating the formation of the intrinsic Josephson junction array.

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“…However, for the fabrication of intrinsic Josephson junctions, advanced micro-fabrication techniques, such as a focused-ion-beam (FIB) or high-resolution photolithography, are generally involved [6][7][8]. For the applications to the cryoelectronics and investigation into the mechanism of high-TC superconductivity [9], the development of a new and simple technique for the fabrication of intrinsic Josephson junctions is important [10]. We have successfully discovered a cross-whiskers junction made by joining two Bi2212 whiskers by post annealing.…”

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A cross-whiskers junction as a novel fabrication process for intrinsic Josephson junctions

Takano

Hatano

Fukuyo

et al. 2001

Supercond. Sci. Technol.

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A Bi2Sr2CaCu2O8+δ cross-whiskers junction has been successfully discovered as a novel intrinsic Josephson junction without using any technique for micro-fabrication. Two Bi2Sr2CaCu2O8+δ whisker crystals were placed crosswise on a MgO substrate and heated at 850 °C for 30 min. They were electrically connected at their c-planes. The measurement terminals were made at the four ends of the whiskers. The I-V characteristics of the cross-whiskers junction at 5 K were found to show a clear multiple-branch structure with a spacing of approximately 15 mV, which is a feature of an intrinsic Josephson junction. The critical current density JC was estimated to be 1170 A cm-2. The branch structure was strongly suppressed by a magnetic field above 1 kOe.

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Fabrication of Bi2212 cross-whiskers junction

Cited by 16 publications

References 10 publications

Theory ofBi2Sr2CaCu2

Theory ofBi2Sr2CaCu2

d-like symmetry of the order parameter and intrinsic Josephson effects inBi2Sr2CaCu<

A cross-whiskers junction as a novel fabrication process for intrinsic Josephson junctions

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