Possible evidence of a two-gap structure for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Cu</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>TiSe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>superconductor

Zaberchik, Moran; Chashka, K. B.; Patlgan, Larisa; Maniv, Ariel; Baines, C.; King, Philip; Kanigel, Amit

doi:10.1103/physrevb.81.220505

Cited by 19 publications

(16 citation statements)

References 19 publications

(16 reference statements)

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“…The presence of this small energy scale has been confirmed by TDO measurements. Indeed, as shown in The presence of this small gap is, to some extent, consistent with the µSR data [9]. However, in contrast with the present measurements, which do not show any significant change of the coupling ratios with doping (2∆ s ∼ [2.4 − 2.8]k B T c ), the µSR experiments suggested a clear increase of the coupling ratio of the small gap with Cu content, leading to the merging of the two energy scales for optimal doping.…”

Section: B Gap Valuessupporting

confidence: 89%

“…On one hand, thermal conductivity measurements [7] suggested that this system is a conventional single-gap s-wave superconductor, in agreement with our recent specific-heat measurements [8]. 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: Introductionsupporting

confidence: 87%

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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: 89%

Section: Introductionsupporting

confidence: 87%

Magnetic and thermodynamic properties of CuxTiSe2 single crystals

et al. 2017

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“…The concomitant potential landscape and spatial variations of the carrier density at the Fermi level can account for the reported Little-Parks effect, as the supercurrents would move in loops within domains defined by these charge inhomogeneities, independent of the local charge order. While the domain size is compatible with the superconducting coherence length in these samples [36][37][38][39][40], the CDW patches uncovered here are too small to confine superconductivity. We do thus not expect to observe the above Little-Parks effect in superconducting Cu x TiSe 2 crystals.…”

Section: Discussionmentioning

confidence: 84%

Energy-dependent spatial texturing of charge order in 1T−CuxTiSe2

et al. 2019

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We report a detailed study of the microscopic effects of Cu intercalation on the charge density wave (CDW) in 1T -CuxTiSe2. Scanning tunneling microscopy and spectroscopy (STM/STS) reveal a unique, Cu driven spatial texturing of the charge ordered phase, with the appearance of energy dependent CDW patches and sharp π-phase shift domain walls (πDWs). The energy and doping dependencies of the patchwork are directly linked to the inhomogeneous potential landscape due to the Cu intercalants. They imply a CDW gap with unusual features, including a large amplitude, the opening below the Fermi level and a shift to higher binding energy with electron doping. Unlike the patchwork, the πDWs occur independently of the intercalated Cu distribution. They remain atomically sharp throughout the investigated phase diagram and occur both in superconducting and non-superconducting specimen. These results provide unique atomic-scale insight on the CDW ground state, questioning the existence of incommensurate CDW domain walls and contributing to understand its formation mechanism and interplay with superconductivity.

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“…Indeed, the more electronegative sulfur renders the structure of TiS 2 more ionic than that of TiSe 2 , so that a larger electrical resistivity is expected for the sulfide, together with a larger Seebeck coefficient. Behind that rather "chemical" view, lays the question of the respective band gaps of TiS 2 and TiSe 2 , and according to the numerous reports on that topic, the question is still not firmly resolved, although band gaps have been attributed for both compounds [25,[27][28][29][30][31].…”

Section: Resultsmentioning

confidence: 97%