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Article

Coexistence of superconductivity and spin-density wave in (TMTSF)2ClO4: Spatial structure of the two-phase state

Physical Review B: Condensed Matter and Materials Physics. 2014. Vol. 89. No. 5. P. 054518-1-054518-10.
Pudalov V.M., Gerasimenko Y. A., Sanduleanu S. V., Prudkoglyad V. A., Kornilov A. V., Yamada J., Qualls J. S.

We report comprehensive (magneto)transport studies of the two-phase state in (TMTSF)2ClO4, where
superconducting (SC) phase coexists with spin-density wave insulator (SDW). By tuning the degree of ClO4
anion ordering in controlled manner we smoothly suppress the SDWstate and study resulting evolution of the SC
phase spatial texture.We find that as SDWis suppressed, SC regions initially appear inside the SDWinsulator in
a form of filaments extended in the interlayer direction and further merge into the two-dimensional sheets across
the most conducting axis of the crystal. We demonstrate that almost all our results can be explained within the
soliton phase model, though with several assumptions, they can also be related with the creation of nonuniform
deformations.We believe that the anisotropy is intrinsic to SC/SDWcoexistence in various quasi-one-dimensional
superconductors.