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Crossover from impurity-controlled to granular superconductivity in ( TMTSF ) 2 ClO 4

Authors :
Yonezawa, Shingo
Marrache-Kikuchi, Claire
Bechgaard, Klaus
Jérome, Denis
Quantum Material Laboratory
Okayama University
Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM)
Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Department of Chemistry, H.C. Oersted Institute
H.C. Oersted Institute
Laboratoire de Physique des Solides (LPS)
Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)
Source :
Physical Review B: Condensed Matter and Materials Physics (1998-2015), Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2018, 97 (1), ⟨10.1103/physrevb.97.014521⟩
Publication Year :
2018
Publisher :
HAL CCSD, 2018.

Abstract

International audience; Using a proper cooling procedure, a controllable amount of nonmagnetic structural disorder can be introduced at low temperature in (TMTSF) 2 ClO 4. Here we performed simultaneous measurements of transport and magnetic properties of (TMTSF) 2 ClO 4 in its normal and superconducting states, while finely covering three orders of magnitude of the cooling rate around the anion ordering temperature. Our result reveals, with increasing density of disorder, the existence of a crossover between homogeneous defect-controlled d-wave superconductivity and granular superconductivity. At slow cooling rates, with small amount of disorder, the evolution of superconducting properties is well described with the Abrikosov-Gorkov theory, providing further confirmation of non-s-wave pairing in this compound. In contrast, at fast cooling rates, zero resistance and diamagnetic shielding are achieved through a randomly distributed network of superconducting puddles embedded in a normal conducting background and interconnected by proximity effect coupling. The temperature dependence of the ac complex susceptibility reveals features typical for a network of granular superconductors. This makes (TMTSF) 2 ClO 4 a model system for granular superconductivity where the grain size and their concentration are tunable within the same sample.

Details

Language :
English
ISSN :
10980121 and 1550235X
Database :
OpenAIRE
Journal :
Physical Review B: Condensed Matter and Materials Physics (1998-2015), Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2018, 97 (1), ⟨10.1103/physrevb.97.014521⟩
Accession number :
edsair.dedup.wf.001..b9c688bca33aaa270cb0dc073b1a1159