Nonlinearity of the current-voltage characteristics for YBa2Cu3O7–x single crystals and the Berezinskii-Kosterlitz-Thouless transition

Vasyutin, M. A.; Golovashkin, A. I.; Kuz’michev, N. D.

doi:10.1134/s1063783406120031

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…Our results for the BKT transition have been obtained in conditions different from those reported earlier for YBCO single crystals [36][37][38]. A single crystal investigated in [36] showed a wide resistive transition in the ab-plane, 81.6 − 83.3 K, and superconductivity along the c-axis which appeared at around 76 K. T BKT = 80 K was obtained by fitting the BKT scaling to the temperature dependencies R ab (T ) and α(T ), where α is the exponent from the I-V characteristics.…”

Section: Discussioncontrasting

confidence: 64%

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BKT transition observed in magnetic and electric properties of YBa2Cu3O7−δ single crystals

Nizhankovskiy

Rogacki

2019

Phys. Rev. B

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Superconductivity of YBa2Cu3O 7−δ single crystals was investigated in small magnetic fields. In magnetic measurements the superconducting transition for H c appears 0.4 K higher than for H⊥c. In this temperature range superconductivity is two-dimensional and the total thickness of superconducting layers is about 0.83 of the sample thickness, which is a consequence of the occurrence of the quasi-insulating plane in the unit cell of the crystal structure. Resistivity in the ab-plane and along the c-axis was measured simultaneously. In these measurements two-dimensional superconductivity was observed in a temperature range of 0.6-0.8 K with the clear signs of the Berezinskii-Kosterlitz-Touless (BKT) transition which occurs approximately 0.15 K below Tc, the mean-field transition temperature.

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Section: Discussioncontrasting

confidence: 64%

“…superconductivity had a 3D character. For studies reported in [38], the resistance of a single crystal along the c-axis was not measured, so the 2D character of the superconductivity was not proved. On the other hand, the BKT type transition has been confirmed in another cuprate, the stripe superconductor La 2−x Ba x CuO 4 [39,40].…”

Section: Discussionmentioning

confidence: 99%