Material preparation and superconducting properties of Li–Pd–B ternary boride

Takeya, Hiroyuki; Yamada, K.; Yamaura, Kazunari; Mochiku, Takashi; Fujii, Hiroki; Furubayashi, T.; Hirata, Kazuto; Togano, K.

doi:10.1016/j.physc.2005.01.032

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…The result is not surprising considering the T c of 8.2K from ref. [18] and the offset-T c of 8.2K reported from the resistivity measurements [1,3,21]. Recalling our results from 4.1. and 4.2., it seems that post-annealing allows to bring the stoichiometry, especially that of Li, at its optimum for which T c is maximum.…”

Section: Annealing Of LI 2 Pd 3 B Samplessupporting

confidence: 89%

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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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Section: Annealing Of LI 2 Pd 3 B Samplessupporting

confidence: 89%

“…Samples were prepared by a combined arc melting and solid state reaction method. On the other hand, Takeya et al [21] prepared samples by arc melting and solid state reaction using rf and conventional heating. Samples were measured by a SQUID magnetometer.…”

Section: Annealing Of LI 2 Pd 3 B Samplesmentioning

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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“…3͑b͔͒ was employed and the determinations are plotted in the main panel as crosses. The irreversible area in the superconducting diagram is slightly larger than that for the structurally isotropic compound Li 2 Pd 3 B which has nearly the same T c , [19][20][21][22] reflecting possible enhancement of vortex liquid or glass states due to the enhanced anisotropic feature of -Mo 3 C 2 . 23 To deepen understanding of the superconducting dimensionality of -Mo 3 C 2 , a single-crystal study would play a pivotal role if it is available.…”

Section: Resultsmentioning

confidence: 86%

Superconductivity in the hexagonal-layered molybdenum carbideη−Mo3C2

et al. 2006

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The hexagonal-layered superconductor -Mo 3 C 2 ͑T c = 8.5 K͒ was investigated by neutron diffraction, magnetic susceptibility, and specific-heat measurements. A significant layered character was found in the structure, which comprises edge-sharing CMo 6 octahedra sheets and ϳ50% carbon occupied blocks. Magnetic characterization revealed the Ginzburg-Landau parameter of -Mo 3 C 2 is ϳ26, which is close to that for the comparable T c compound Li 2 Pd 3 B ͑ϳ21͒, but less than a half of that for MgCNi 3 ͑ϳ54͒. The molybdenum carbide would provide valuable opportunities to deepen understanding of those unconventional superconductors.

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“…After high temperature heating, samples were slow cooled from T s = 720-740°C down to 550°C. Temperatures for the slow cooling were selected based on our experience with post-annealing of the arc-melted samples [10] and the literature information indicating that Li 2 Pd 3 B forms from mixtures of arc-melted P 3 B and Li at about 600-700°C for 48 h when using BN capsules and Ar-atmosphere under a pressure of 20-25 MPa [13], at about 800°C when a open crucible in a RF furnace [14] is used, or at 700°C for 48 h when the sample is placed in a Ta-tube and sealed in a quartz tube [14]. Proposed growth procedure has the advantage that it does not involve sealing, high pressure, and arc melting demanding operations.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%