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Investigations of the zero-field (a,b)-plane conductivity of YBa2Cu3O7-δ near the critical temperature

Investigations of the zero-field (a,b)-plane conductivity of YBa2Cu3O7-δ near the critical temperature
Investigations of the zero-field (a,b)-plane conductivity of YBa2Cu3O7-δ near the critical temperature
The resistive transition R(T) and the current–voltage characteristics (I–V) in the range 10-9 – 10-6 V and close to the critical temperature (Tc) were measured in a single-grain of melt-textured YBa2Cu3O7-δ (YBCO) and in a detwinned YBCO single-crystal, with the transport current parallel to the (a,b) planes and in zero external magnetic field using a SQUID picovoltmeter. In the case of the melt-textured sample, we measured the I–V curves also at higher levels of dissipation. For T<Tc, we interpreted the lower part of the I–V curves in the framework of the Jensen–Minnhagen model of current-induced unbinding of thermally-created vortex–antivortex pairs, which leads to V ∝ I(I-Ic1)a-1. Our results confirm a recently proposed current–temperature (I–T) phase diagram by S.W. Pierson. In addition, we determined for the first time the dependence of the characteristic (unbinding) current Ic1 with t = 1-T/Tc for temperatures very close to Tc and low transport currents.
YBCO, critical temperature, current, voltage
0921-4534
1-7
Crisan, A.
44bf9544-7340-46f9-bd2f-3495bbfbb111
Gordeev, S.N.
2d51d5e7-5fbd-4753-8eb8-a21ff61deb07
Manton, S.
ff9b229c-9500-4215-96b7-c0bfd5ba76d4
Rassau, A.P.
c90b777f-4a72-4f0d-9635-855a10246e1d
Popa, S.
c08675a7-c77c-49d5-aa38-b78cc5ca44cf
Beduz, C.
15245681-77b5-4b29-a8fc-23296f13bc57
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Gagnon, R.
a45ce1df-0d8e-49c8-a86e-faeddd7b426a
Taillefer, L.
f034a4d8-8435-4448-a2e7-bebf79590f75
Crisan, A.
44bf9544-7340-46f9-bd2f-3495bbfbb111
Gordeev, S.N.
2d51d5e7-5fbd-4753-8eb8-a21ff61deb07
Manton, S.
ff9b229c-9500-4215-96b7-c0bfd5ba76d4
Rassau, A.P.
c90b777f-4a72-4f0d-9635-855a10246e1d
Popa, S.
c08675a7-c77c-49d5-aa38-b78cc5ca44cf
Beduz, C.
15245681-77b5-4b29-a8fc-23296f13bc57
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Gagnon, R.
a45ce1df-0d8e-49c8-a86e-faeddd7b426a
Taillefer, L.
f034a4d8-8435-4448-a2e7-bebf79590f75

Crisan, A., Gordeev, S.N., Manton, S., Rassau, A.P., Popa, S., Beduz, C., de Groot, P.A.J., Gagnon, R. and Taillefer, L. (1998) Investigations of the zero-field (a,b)-plane conductivity of YBa2Cu3O7-δ near the critical temperature. Physica C: Superconductivity And its Applications, 309 (1-2), 1-7. (doi:10.1016/S0921-4534(98)00578-4).

Record type: Article

Abstract

The resistive transition R(T) and the current–voltage characteristics (I–V) in the range 10-9 – 10-6 V and close to the critical temperature (Tc) were measured in a single-grain of melt-textured YBa2Cu3O7-δ (YBCO) and in a detwinned YBCO single-crystal, with the transport current parallel to the (a,b) planes and in zero external magnetic field using a SQUID picovoltmeter. In the case of the melt-textured sample, we measured the I–V curves also at higher levels of dissipation. For T<Tc, we interpreted the lower part of the I–V curves in the framework of the Jensen–Minnhagen model of current-induced unbinding of thermally-created vortex–antivortex pairs, which leads to V ∝ I(I-Ic1)a-1. Our results confirm a recently proposed current–temperature (I–T) phase diagram by S.W. Pierson. In addition, we determined for the first time the dependence of the characteristic (unbinding) current Ic1 with t = 1-T/Tc for temperatures very close to Tc and low transport currents.

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More information

Published date: 1998
Keywords: YBCO, critical temperature, current, voltage

Identifiers

Local EPrints ID: 21274
URI: https://eprints.soton.ac.uk/id/eprint/21274
ISSN: 0921-4534
PURE UUID: c05c93f2-d051-45a3-a35d-4b22d33b32df

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Date deposited: 17 Nov 2006
Last modified: 24 Jul 2017 16:36

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