Observation of a transverse Meissner effect in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Cu</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>TiSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>single crystals

Medvecka, Zuzana; Klein, Thierry; Cambel, V.; Šoltýs, J.; Karapetrov, G.; Lévy-Bertrand, F.; Michon, B.; Marcenat, C.; Samuely, P.

doi:10.1103/physrevb.93.100501

Cited by 7 publications

(8 citation statements)

References 28 publications

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“…A domain superstructure with exactly this scale could be the reason for this effect in Cu x TiSe 2 . Note also that observation of the lock-in effect [10] in this system points to a strong variation of the line tension (i.e., superfluid density) along the c direction. Even if this scenario requires further consideration, strong modulations of the superconducting parameter might probably lead to different "gap measurements" depending on the probe used to determine this gap.…”

Section: B Gap Valuessupporting

confidence: 51%

“…On the other hand, µSR measurements [9] displayed an anomalous temperature dependence of the London penetration depth indicating the presence of two superconducting gaps in underdoped Cu x TiSe 2 where coexistence between CDW and superconductivity was anticipated. Recently, our local magnetic measurements revealed the existence of an unexpected transverse Meissner effect, clearly showing that vortices remain locked along the ab−planes in tilted magnetic fields [10], hence indicating the presence of an unexpected -and still unexplained -strong modulation of the pinning energy along the c−direction, which might be related to a modulation of the gap/order parameter.…”

Section: Introductionmentioning

confidence: 73%

“…The onset of the field penetration is very sharp and the presence of a small critical current does not put in question the determination of H p . Note that an anomalous transverse Meissner effect has been observed for the tilted magnetic fields in the samples C, G and A [10] (labeled sample 1, 2 and 3, respectively).…”

Section: Sample Preparation and Experimentsmentioning

confidence: 97%

“…As shown in Fig.4a, this partial penetration in the sample corners is clearly observed in our crystals, as a finite B value is measured on probe HP4 (and HP14, not shown here) for H a values significantly smaller than for other probes, hence clearly indicating that the penetration process is dominated by geometrical barriers (see Refs. [19] and [10] for a detailed analysis of the field dependence of the profiles in the framework of the geometrical barriers theory [17]). …”

Section: Sample Preparation and Experimentsmentioning

confidence: 99%

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Magnetic and thermodynamic properties of CuxTiSe2 single crystals

et al. 2017

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We present a detailed study of the phase diagram of copper intercalated TiSe2 single crystals, combining local Hall-probe magnetometry, tunnel diode oscillator technique (TDO), and specific heat and angle-resolved photoemission spectroscopy measurements. A series of the CuxTiSe2 samples from three different sources with various copper content x and superconducting critical temperatures Tc have been investigated. We first show that the vortex penetration mechanism is dominated by geometrical barriers enabling a precise determination of the lower critical field, Hc1. We then show that the temperature dependence of the superfluid density deduced from magnetic measurements (both Hc1 and TDO techniques) clearly suggests the existence of a small energy gap in the system, with a coupling strength 2∆s ∼ [2.4 − 2.8]kBTc, regardless of the copper content, in puzzling contradiction with specific heat measurements which can be well described by one single large gap 2∆ l ∼ [3.7 − 3.9]kBTc. Finally, our measurements reveal a non-trivial doping dependence of the condensation energy, which remains to be understood.

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Section: B Gap Valuessupporting

confidence: 51%

Section: Introductionmentioning

confidence: 73%

Section: Sample Preparation and Experimentsmentioning

confidence: 97%

Section: Sample Preparation and Experimentsmentioning

confidence: 99%

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Magnetic and thermodynamic properties of CuxTiSe2 single crystals

et al. 2017

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“…It is worth noting that a very strong lock-in of the vortices along the ab−planes has been observed recently [27] in Hall probe magnetization measurements. This lock-in effect clearly indicates a strong modulation of the core energy (i.e.…”

Section: Resultsmentioning

confidence: 66%

Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu10%TiSe2

Lévy-Bertrand

Michon

Marcus

et al. 2016

Physica C: Superconductivity and its Applications

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We report on specific heat and magnetotransport measurements performed on superconducting Cu 10% TiSe 2 single crystals. We show that superconductivity persists in transport measurements up to magnetic fields H R well above the upper critical field H c2 deduced from the calorimetric measurements. Surprisingly this "surface" superconductivity is present for all magnetic field orientations, either parallel or perpendicular to the layers. For H ab, the temperature dependence of the H R /H c2 ratio can be well reproduced by solving the Ginzburg-Landau equations in presence of a surface layer with reduced superconducting properties. Unexpectedly this temperature dependence does not depend on the field orientation.

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Ultrafast charge ordering by self-amplified exciton–phonon dynamics in TiSe2

Lian

Zhang

et al. 2020

Nat Commun

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The origin of charge density waves (CDWs) in TiSe has long been debated, mainly due to the difficulties in identifying the timescales of the excitonic pairing and electron–phonon coupling (EPC). Without a time-resolved and microscopic mechanism, one has to assume simultaneous appearance of CDW and periodic lattice distortions (PLD). Here, we accomplish a complete separation of ultrafast exciton and PLD dynamics and unravel their interplay in our real-time time-dependent density functional theory simulations. We find that laser pulses knock off the exciton order and induce a homogeneous bonding–antibonding transition in the initial 20 fs, then the weakened electronic order triggers ionic movements antiparallel to the original PLD. The EPC comes into play after the initial 20 fs, and the two processes mutually amplify each other leading to a complete inversion of CDW ordering. The self-amplified dynamics reproduces the evolution of band structures in agreement with photoemission experiments. Hence we resolve the key processes in the initial dynamics of CDWs that help elucidate the underlying mechanism.

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Observation of a transverse Meissner effect inCuxTiSe2single crystals

Cited by 7 publications

References 28 publications

Magnetic and thermodynamic properties of CuxTiSe2 single crystals

Magnetic and thermodynamic properties of CuxTiSe2 single crystals

Puzzling evidence for surface superconductivity in the layered dichalcogenide Cu10%TiSe2

Ultrafast charge ordering by self-amplified exciton–phonon dynamics in TiSe2

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