Anisotropic zero-resistance onset in organic superconductors

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

doi:10.1103/physrevb.103.014519

Cited by 10 publications

(18 citation statements)

References 53 publications

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“…NPS shows that intertwined and interlocked nanoscale lattice structures form heterostructures at the atomic limit [13]. This induces the emergence of novel functionalities, such as high-temperature superconductivity, in complex quantum materials as organics [13][14][15][16][17][18][19][20], doped perovskites [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39], iron-based superconductors [40][41][42][43][44], chargedensity-wave materials [45][46][47][48][49][50][51][52], manganites showing colossal magnetoresistance [53][54][55][56][57], doped diborides [58][59]…”

Section: Introductionmentioning

confidence: 99%

Functional Nanoscale Phase Separation and Intertwined Order in Quantum Complex Materials

Campi

Bianconi

2021

Condensed Matter

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Nanoscale phase separation (NPS), characterized by particular types of correlated disorders, plays an important role in the functionality of high-temperature superconductors (HTS). Our results show that multiscale heterogeneity is an essential ingredient of quantum functionality in complex materials. Here, the interactions developing between different structural units cause dynamical spatiotemporal conformations with correlated disorder; thus, visualizing conformational landscapes is fundamental for understanding the physical properties of complex matter and requires advanced methodologies based on high-precision X-ray measurements. We discuss the connections between the dynamical correlated disorder at nanoscale and the functionality in oxygen-doped perovskite superconducting materials.

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Section: Introductionmentioning

confidence: 99%

Functional Nanoscale Phase Separation and Intertwined Order in Quantum Complex Materials

Campi

Bianconi

2021

Condensed Matter

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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%

“…The z-axis size of SC domains can be estimated by the SC percolation in finite-size samples, corresponding to the zero-resistence onset in thin FeSe samples, as was done to explain the anisotropic zero-resistance onset in organic superconductors [31]. On the other hand, the SC domain shape can be estimated from the anisotropy of excess conductivity above T c in combination with diamagnetic response data, similar to Refs.…”

Section: Introductionmentioning

confidence: 98%

“…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 [28][29][30][31], as described in the next section. An anisotropic excess conductivity, measured in FeSe above T c in Ref.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Отдельно стоит отметить возможность косвенного экспериментального подтверждения пространственного фазового разделения, часто сопутствующего фазовым переходам первого рода, по температурной зависимости анизотропии сопротивления. Теория проводимости в гетерогенных материалах [20], примененная к сильно анизотропным материалам [21][22][23][24][25][26], указывает на специфическую зависимость анизотропии сопротивления, которая может дать информацию о приблизительных форме и размере островков одной фазы в матрице другой, например, металлической или любой хорошо проводящей фазы в материале с ВЗП.…”

Section: международный симпозиум "unclassified

Гистерезис Тензора Сопротивления В Полителлуридах Редкоземельных Металлов

Григорьев¹,

Синченко²,

Могилюк³

et al. 2022

Физика Твердого Тела

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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.

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Anisotropic zero-resistance onset in organic superconductors

Cited by 10 publications

References 53 publications

Functional Nanoscale Phase Separation and Intertwined Order in Quantum Complex Materials

Functional Nanoscale Phase Separation and Intertwined Order in Quantum Complex Materials

Inhomogeneous superconductivity onset in FeSe studied by transport properties

Гистерезис Тензора Сопротивления В Полителлуридах Редкоземельных Металлов

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