Evolution of Shape and Volume Fraction of Superconducting Domains with Temperature and Anion Disorder in (TMTSF)2ClO4

Kesharpu, K. K.; Kochev, Vladislav D.; Grigoriev, P. D.

doi:10.3390/cryst11010072

Cited by 7 publications

(5 citation statements)

References 74 publications

(210 reference statements)

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“…It is also worth noting the possibility of indirectly experimental confirmation of the spatial phase separation, often associated with phase transitions of the first kind, on the temperature dependence of resistance anisotropy. The conductivity theory in heterogeneous materials [20], applied to highly anisotropic materials [21][22][23][24][25][26], indicates a specific dependence of resistance anisotropy, which can give information about the approximate shape and size of the islets of one phase in the matrix of the other, for example, metal or any well-conducting phase in the material with CDW.…”

Section: Discussion Of Possible Further Experimental Confirmations An...mentioning

confidence: 99%

Hysteresis of resistivity tensor in rare-earth polytellurides

P.D.

Синченко

Mogilyuk

et al. 2022

Physics of the Solid State

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Possible reasons for the temperature hysteresis of the Hall and diagonal components of resistivity tensor in tritellurides and tetratellurides of rare-earth metals, respectively, are analyzed. The width of this hysteresis exceeds 100 K in both families. This hysteresis is related to the charge density wave (CDW), but its detailed nature is still being discussed. It is known that it cannot be explained by a temperature variation in the CDW wave vector. In this paper, we discuss various interpretations of the observed hysteresis, present new experimental data showing a strong dependence of the hysteresis value on the temperature range, and propose new experiments (or a detailed analysis of unpublished data from existing ARPES measurements) that can substantiate or refute the proposed explanations for this unusual effect. Keywords: charge density wave, hysteresis, conductivity, Hall coefficient, anisotropy.

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Section: Discussion Of Possible Further Experimental Confirmations An...mentioning

confidence: 99%

Hysteresis of resistivity tensor in rare-earth polytellurides

P.D.

Синченко

Mogilyuk

et al. 2022

Physics of the Solid State

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“…A first method based on combined transport and diamagnetic-response measurements in bulk material has been proposed recently and applied to analyze the SC heterogeneity in several strongly anisotropic materials, including FeSe [28,29], YBa 2 Cu 4 O 8 [30], and several organic superconductors [30,31,34]. These materials have a layered crystal structure and, hence, a strong anisotropy of electronic properties, common to all ambient-pressure high-Tc superconductors.…”

Section: The Origin Of Anisotropic Resistivity Drop Above T C and Max...mentioning

confidence: 99%

Inhomogeneous superconductivity onset in FeSe studied by transport properties

Grigoriev¹,

Kochev²,

Orlov³

et al. 2023

Preprint

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Heterogeneous superconductivity onset is a common phenomenon in high-Tc superconductors, both of cuprate and iron-based families. It is revealed by a rather broad transition from metallic to zero-resistance state. Usually, in these strongly anisotropic materials superconductivity (SC) first emerges in the form of isolated domains. It results to anisotropic excess conductivity above Tc, and the transport measurements give valuable information about the SC domain structure deep inside the sample. In bulk samples this anisotropic SC onset gives an averaged approximate shape of SC grains, but in thin samples it also suggests the averaged SC grain size. In this paper both interlayer and intralayer resistivity is measured as a function of temperature in FeSe samples of various thickness. To measure the interlayer resistivity microbridges of FeSe are produced using FIB. A considerable raise of superconducting transition temperature Tc is observed as the sample thickness decreases: Tc raises from 8 K in bulk material to 12 K in microbridges of thickness 40 nm. We apply analytical and numerical calculations to analyze these and earlier data and find the SC domain aspect ratio and size in FeSe consistent with our resistivity and diamagnetic response measurements. We propose a simple and rather precise method of estimating the SC domain aspect ratio from Tc anisotropy in samples of various small thickness. The relationship between nematic and superconducting domains in FeSe is discussed. We also generalized the analytical formulas for conductivity in heterogeneous anisotropic superconductors for the case of elongated SC domains of two perpendicular orientations with equal volume fractions, corresponding to nematic domain structure in various Fe-based superconductors.

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“…A new method, based on combined transport and diamagnetic-response measurements in bulk material, was recently suggested and applied to study the SC heterogeneity in several strongly anisotropic materials, including FeSe [32,33], YBa 2 Cu 4 O 8 [34], and several organic superconductors [34][35][36]. These materials have a layered crystal structure and, hence, a strong anisotropy of electronic properties, which is typical of all ambientpressure high-T c superconductors.…”

Section: The Origin Of Anisotropic Resistivity Drop Above T C and The...mentioning

confidence: 99%

“…Hence, it would be very useful to study SC inhomogeneity deep inside the bulk sample. Although less visual, two such methods based on combined transport and diamagnetic-response measurements in bulk and finite-size samples were proposed recently [32][33][34][35][36][37], as described in the next section. The scenario of inhomogeneous SC onset in the form of isolated islands is supported by anisotropic excess conductivity in FeSe above T c , measured in Ref.…”

Section: Introductionmentioning

confidence: 99%

Inhomogeneous Superconductivity Onset in FeSe Studied by Transport Properties

et al. 2023

Self Cite

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Heterogeneous superconductivity onset is a common phenomenon in high-Tc superconductors of both the cuprate and iron-based families. It is manifested by a fairly wide transition from the metallic to zero-resistance states. Usually, in these strongly anisotropic materials, superconductivity (SC) first appears as isolated domains. This leads to anisotropic excess conductivity above Tc, and the transport measurements provide valuable information about the SC domain structure deep within the sample. In bulk samples, this anisotropic SC onset gives an approximate average shape of SC grains, while in thin samples, it also indicates the average size of SC grains. In this work, both interlayer and intralayer resistivity were measured as a function of temperature in FeSe samples of various thicknesses. To measure the interlayer resistivity, FeSe mesa structures oriented across the layers were fabricated using FIB. As the sample thickness decreases, a significant increase in superconducting transition temperature Tc is observed: Tc raises from 8 K in bulk material to 12 K in microbridges of thickness ∼40 nm. We applied analytical and numerical calculations to analyze these and earlier data and find the aspect ratio and size of the SC domains in FeSe consistent with our resistivity and diamagnetic response measurements. We propose a simple and fairly accurate method for estimating the aspect ratio of SC domains from Tc anisotropy in samples of various small thicknesses. The relationship between nematic and superconducting domains in FeSe is discussed. We also generalize the analytical formulas for conductivity in heterogeneous anisotropic superconductors to the case of elongated SC domains of two perpendicular orientations with equal volume fractions, corresponding to the nematic domain structure in various Fe-based superconductors.

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Evolution of Shape and Volume Fraction of Superconducting Domains with Temperature and Anion Disorder in (TMTSF)2ClO4

Cited by 7 publications

References 74 publications

Hysteresis of resistivity tensor in rare-earth polytellurides

Hysteresis of resistivity tensor in rare-earth polytellurides

Inhomogeneous superconductivity onset in FeSe studied by transport properties

Inhomogeneous Superconductivity Onset in FeSe Studied by Transport Properties

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