Low-temperature specific-heat and neutron-diffraction studies on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Li</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Pd</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi mathvariant="normal">B</mml:mi></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Li</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Pt</mml:mi><mml:mn>3</m

Takeya, Hiroyuki; Hirata, Kazuto; Yamaura, Kazunari; Togano, K.; Massalami, M. El; Rapp, R.E.; Chaves, Francisco A.; Ouladdiaf, B.

doi:10.1103/physrevb.72.104506

Cited by 54 publications

(58 citation statements)

References 13 publications

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“…Similar fits below T/Tc = 0.6 have been used in the analysis of other noncentrosymmetric superconductors with comparable transition temperatures. 17,18,28 The above analysis suggests that Nb 0.18 Re 0.82 is a BCS-type isotropic-gapped superconductor.…”

Section: 25mentioning

confidence: 93%

Physical properties of the noncentrosymmetric superconductor Nb0.18Re0.82

et al. 2011

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PACS number(s): 74.70.AdWe report the synthesis and measurements of magnetic, transport, and thermal properties of polycrystalline Nb 0.18 Re 0.82 , which has a superconducting transition at T c ~ 8.8 K. The noncentrosymmetric α-Mn structure of the compound is confirmed by X-ray diffraction. Using the measured values for the lower critical field H c1 , upper critical field H c2 , and the specific heat C, we estimate the thermodynamic critical field H c (0), coherence length ξ(0), penetration depth λ(0), and the Ginzburg-Landau parameter κ(0). The specific heat jump at T c , ΔC/γT c = 1.86, suggests that Nb 0.18 Re 0.82 is a moderately coupled superconductor. Below T c the electronic specific heat decays exponentially, suggesting that the gap is isotropic. Our data suggest that the triplet admixture is weak in the polycrystalline form of compound. However, the estimated value of the upper critical field H c2 (0) is close to the calculated Pauli limit.

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Section: 25mentioning

confidence: 93%

Physical properties of the noncentrosymmetric superconductor Nb0.18Re0.82

et al. 2011

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“…16,17 The nodal gap structure of Li 2 Pt 3 B hinted by the penetration depth measurement, however, is controversial since the specific heat and µSR measurements suggest conventional pairing. 15,17 Microscopically, the lack of inversion symmetry allows a parity-breaking spin-orbital interaction which leads to a magnetization induced by the phase gradient associated with the superconducting order parameter, and vice versa. 18 For an ideally two-dimensional system, the phase gradient induced by the constant magnetic field, or the so-called helical phase, might be measured using a Josephson junction between a conventional and a noncentrosymmetric superconductor.…”

Section: Introductionmentioning

confidence: 99%

Transverse Magnetic Field Distribution in the Vortex State of Noncentrosymmetric Superconductor with O Symmetry

Yip

2009

J Low Temp Phys

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We investigate the magnetic field distribution inside a Type II superconductor which has point group symmetry O such as Li2Pt3B. The absence of inversion symmetry as a departure from perfect cubic group O h causes a magnetization collinear with the phase gradient associated with the order parameter, and a component of current collinear with the local magnetic field. In the vortex state, we predict, by solving the Maxwell equation, a local magnetic field transverse to the vortex lines. The probability distribution of this transverse field is also obtained for the prospective muon-spinrotation measurements.

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“…Material has an interesting structure [4,5] that can be described as cubic, of antiperovskitelike type. It is composed of Pd 6 B distorted octahedrons which resemble octahedrons from the structure of high-T c superconductors (HTS), ruthenates, cobaltates and MgNi 3 C. Distorsion was suggested to influence superconductivity [6] through strong electronic correlations related to three kinds of Z-Z bond length, with Z=Pd or Pt.…”

Section: Introductionmentioning

confidence: 99%

Discovery of Li2(Pd,Pt)3B superconductors

Badica

Togano

Takeya

et al. 2007

Physica C: Superconductivity and its Applications

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Critical temperature T c of the Li 2 (Pd 1-x Pt x ) 3 B was reported to be 7-8K for x=0 and 2.2-2.8K for x=1. In this article we present our preliminary results on behavior of magnetization-temperature curves with starting composition of Pd-B precursor, y-Li concentration in Li y Pd 3 B and postannealing of the Pd-end compound. Results suggest that to maximize T c ratio Pd:B should be close to 3:1, while y-Li has to be optimum. The lowest T c for Li y Pd 3 B was 4.4-4.6K, while postannealings at 560°C allowed enhancement of T c up to 8.2-8.4K. Compositions Li 2 Z 3 B with Z=Ni, Ru, Rh, Re, Ag are not superconducting down to 1.8K. Exception is composition with Re showing superconductivity due to Re 3 B compound. All samples were prepared by arc melting.

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Low-temperature specific-heat and neutron-diffraction studies onLi2Pd3BandLi2Pt3

Cited by 54 publications

References 13 publications

Physical properties of the noncentrosymmetric superconductor Nb0.18Re0.82

Physical properties of the noncentrosymmetric superconductor Nb0.18Re0.82

Transverse Magnetic Field Distribution in the Vortex State of Noncentrosymmetric Superconductor with O Symmetry

Discovery of Li2(Pd,Pt)3B superconductors

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