Magnetic field, frequency and temperature dependence of complex conductance of ultrathin La1.65Sr0.45CuO4/La2CuO4 films and the organic superconductors κ-(BEDT-TTF)2Cu[N(CN)2]Br

Bozovic, I.; He, Xi; Dubuis, G.; Pavuna, D.; Kushch, N. D.; Yagubskii, E. B.; Schlueter, J. A.

doi:10.1142/S0217979215420126

Title: Magnetic field, frequency and temperature dependence of complex conductance of ultrathin La_1.65Sr_0.45CuO₄/La₂CuO₄ films and the organic superconductors κ-(BEDT-TTF)₂Cu[N(CN)₂]Br

Journal Article · Tue Sep 01 00:00:00 EDT 2015 · International Journal of Modern Physics B

DOI:https://doi.org/10.1142/S0217979215420126· OSTI ID:1235867

Bozovic, I. ^[1]; He, Xi ^[1]; Dubuis, G. ^[2]; Pavuna, D. ^[3]; Kushch, N. D. ^[4]; Yagubskii, E. B. ^[4]; Schlueter, J. A. ^[5]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Ecole Polytechnique Federale de Lausanne, Lausanne (Switzerland)
Ecole Polytechnique Federale de Lausanne, Lausanne (Switzerland)
Institute of Problems of Chemical Physics RAS, Chernogolovka (Russia)
Argonne National Lab. (ANL), Argonne, IL (United States)

In this study, we used atomic-layer molecular beam epitaxy (ALL-MBE) to synthesize bilayer films of a cuprate metal (La_1.65Sr_0.45CuO₄) and a cuprate insulator (La₂CuO₄), in which interface superconductivity occurs in a layer that is just one-half unit cell thick. We have studied the magnetic field and temperature dependence of the complex sheet conductance, σ(ω), of these films, and compared them to κκ-(BEDT-TTF)₂Cu[N(CN)₂]Br single crystals. The magnetic field H was applied both parallel and perpendicular to the 2D conducting layers. Experiments have been carried out at frequencies between 23 kHz and 50 MHz using either two-coil mutual inductance technique, or the LC resonators with spiral or rectangular coils. The real and the imaginary parts of the mutual-inductance M(T,ω) between the coil and the sample were measured and converted to complex conductivity. For H perpendicular to the conducting layers, we observed almost identical behavior in both films and κ-Br single crystals: (i) the transition onset in the inductive response, L_k^–1(T) occurs at a temperature lower by 2 K than in Re σ(T), (ii) this shift is almost constant with magnetic field up to 8 T; (iii) the vortex diffusion constant D(T) is exponential due to pinning of vortex cores. These results can be described by the extended dynamic theory of the Berezinski–Kosterlitz–Thouless (BKT) transition and dynamics of bound vortex–antivortex pairs with short separation lengths.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704

OSTI ID:: 1235867

Report Number(s):: BNL-111659-2015-JA; R&D Project: MA509MACA; KC0203020

Journal Information:: International Journal of Modern Physics B, Vol. 29, Issue 25-26; ISSN 0217-9792

Publisher:: World ScientificCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Title: Magnetic field, frequency and temperature dependence of complex conductance of ultrathin La_1.65Sr_0.45CuO₄/La₂CuO₄ films and the organic superconductors κ-(BEDT-TTF)₂Cu[N(CN)₂]Br