Ca<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>Ir<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>Sn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>13</mml:mn></mml:msub></mml:math>: A weakly correlated nodeless superconductor

Wang, K. F.; Petrović, C.

doi:10.1103/physrevb.86.024522

Cited by 69 publications

(97 citation statements)

References 35 publications

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“…11 The NMR measurements were carried out using the conventional pulsed NMR technique on 119 Sn (nuclear spin I = 1/2) nuclei in a temperature range 1.5 K ≤ T ≤ 60 K at 33 MHz in random oriented polycrystalline sample. For this purpose we have crushed the single crystal into powder and mixed them in paraffin.…”

Section: Methodsmentioning

confidence: 99%

“…10 On the other hand Wang et al attributed that anomaly to a significant Fermi surface reconstruction and the opening of a charge density wave gap at the super-lattice transition. 11,12 While they classified Ca 3 Ir 4 Sn 13 as a weakly correlated nodeless superconductor, recent µSR investigations reveal that the electronphonon pairing interaction is in the strong-coupling limit. Furthermore µSR and macroscopic measurements indicated the presence of multiple isotropic gaps with different magnitudes.…”

Section: Introductionmentioning

confidence: 99%

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119Sn-NMR investigations on superconducting Ca3Ir4Sn13: Evidence for multigap superconductivity

Sarkar

Brückner

Gunther

et al. 2015

Physica B: Condensed Matter

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We report bulk superconductivity (SC) in Ca3Ir4Sn13 by means of 119 Sn nuclear magnetic resonance (NMR) experiments. Two classical signatures of BCS superconductivity in spin-lattice relaxation rate (1/T1), namely the Hebel-Slichter coherence peak just below the Tc and the exponential decay in the superconducting phase, are evident. The noticeable decrease of 119 Sn Knight shift below Tc indicates spin-singlet superconductivity. The temperature dependence of the spin-lattice relaxation rate (1/T1) is convincingly described by the multigap isotropic superconducting gap. Present NMR experiments do not witness any sign of enhanced spin fluctuations in the normal state.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

119Sn-NMR investigations on superconducting Ca3Ir4Sn13: Evidence for multigap superconductivity

Sarkar

Brückner

Gunther

et al. 2015

Physica B: Condensed Matter

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“…The linear MR at low temperatures suggests that the low-T transport is linked to the linear dispersions, as observed in surfaces of topological insulators (Bi,Sb) 2 (Se,Te) 3 21-25 and SmB 6 , 26 Dirac semimetals Cd 3 As 2 27-29 and Na 3 Bi, 30 and other 3D Dirac materials. [31][32][33] In Figs. 3(a) and 3(b), we compare the magnetoresistance at high temperatures [ Fig. 3(a)] and at low temperatures [ Fig.…”

Section: (A)]mentioning

confidence: 99%

Linear magnetoresistance in a topological insulator Ru2Sn3

Shiomi

Saitoh

2017

AIP Advances

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We have studied magnetotransport properties of a topological insulator material Ru2Sn3. Bulk single crystals of Ru2Sn3 were grown by a Bi flux method. The resistivity is semiconducting at high temperatures above 160 K, while it becomes metallic below 160 K. Nonlinear field dependence of Hall resistivity in the metallic region shows conduction of multiple carriers at low temperatures. In the high-temperature semiconducting region, magnetoresistance exhibits a conventional quadratic magnetic-field dependence. In the low-temperature metallic region, however, high-field magnetoresistance is clearly linear with magnetic fields, signaling a linear dispersion in the low-temperature electronic structure. Small changes in the magnetoresistance magnitude with respect to the magnetic field angle indicate that bulk electron carriers are responsible mainly for the observed linear magnetoresistance.

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“…Unconventional superconductivity is often found in strongly correlated electron systems, displays order parameter with gaps which are anisotropic and displaying sign reversal between different Fermi surface pockets or is related to intrinsic magnetism, connected to competing magnetic phases or display broken symmetries, such as invertion or time reversal symmetry. None of these characteristics is found in this system, which has an s-wave order parameter all over the phase diagram and attractive interaction where phonons appear to play a dominant role.Ca 3 Ir 4 Sn 13 appears to have moderately heavy carriers and weak correlation [12,13]. The dimensionless ratio of the thermopower (Seebeck coefficient) S/T to the specific heat term q = NAveS T γ provided a carrier density q −1 ∼ = 11.8(8) per f.u., corresponding to high DOS per volume [13].…”

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Strong enhancement ofs-wave superconductivity near a quantum critical point ofCa3Ir4Sn13

et al. 2015

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We report microscopic studies by muon spin rotation/relaxation as a function of pressure of the Ca3Ir4Sn13 and Sr3Ir4Sn13 cubic compounds, which are members of the (Ca1−xSrx)3Ir4Sn13 system displaying superconductivity and a structural phase transition associated with the formation of a charge density wave (CDW). We find a strong enhancement of the superfluid density and a dramatic increase of the pairing strength above a pressure of ≈ 1.6 GPa giving direct evidence of the presence of a quantum critical point separating a superconducting phase coexisting with CDW from a pure superconducting phase. The superconducting order parameter in both phases has the same s-wave symmetry. In spite of the conventional phonon-mediated BCS character of the weakly correlated (Ca1−xSrx)3Ir4Sn13 system, the dependence of the effective superfluid density on the critical temperature puts this compound in the "Uemura" plot close to unconventional superconductors. This system exemplifies that conventional BCS superconductors in the presence of competing orders or multi-band structure can also display characteristics of unconventional superconductors. INTRODUCTIONThe interplay between different electronic ground states is one of the fundamental topics in condensed matter physics and is well apparent in phase diagrams as a function of doping, pressure or magnetic fields, resulting in various forms of coexistence, cooperation or competition of the order parameters [1][2][3][4]. Particularly interesting are the regions at phase boundaries or at quantum critical points (QCPs) where different quantum states meet [5]. Very often magnetism and superconductivity are involved and, in spite of diverse structural and physical properties, many compounds show characteristic phase diagrams where superconductivity is found in the vicinity of electronic instabilities of magnetic (mainly antiferromagnetic) origin. In this case spin fluctuations are predominantly considered at the heart of the mechanisms leading to pairing and superconductivity is unconventional. Less common is the case where the electronic instability is linked to the formation of a charge density wave (CDW), which is based on the same electron-phonon interaction found in conventional superconductors.Ternary intermetallic stannide compounds such as R 3 T 4 Sn 13 , where R =La, Ca, Sr and T =Ir, Rh [6,7] are of particular interest because they exhibit many physical properties such as superconductivity, magnetic or charge order, and structural instabilities. The quasiskutteridite cubic superconductor (Ca,Sr) 3 Ir 4 Sn 13 and the related (Ca,Sr) 3 Rh 4 Sn 13 have recently attracted attention because of the presence of a pressure induced structural phase transition at a temperature T * , the possible coexistence of superconducting and charge density wave states, and a putative quantum critical point [8][9][10][11][12][13][14][15][16]. The role and interplay of these degrees of freedom remain a central issue also in many unconventional superconductors, as demonstrated by the recent observa...

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Ca3Ir4Sn13: A weakly correlated nodeless superconductor

Cited by 69 publications

References 35 publications

119Sn-NMR investigations on superconducting Ca3Ir4Sn13: Evidence for multigap superconductivity

119Sn-NMR investigations on superconducting Ca3Ir4Sn13: Evidence for multigap superconductivity

Linear magnetoresistance in a topological insulator Ru2Sn3

Strong enhancement ofs-wave superconductivity near a quantum critical point ofCa3Ir4Sn13

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