High pressure synthesis and superconducting properties of yttrium sesquicarbide

Krupka, M.C.; Giorgi, A.L.; Krikorian, N. H.; Szklarz, E.G.

doi:10.1016/0022-5088(69)90039-3

Cited by 80 publications

(27 citation statements)

References 16 publications

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“…On the basis of the T c values, we roughly classified the samples obtained into two groups: one has a T c of 9-12 K (''low-T c phase'') and the other has a T c of 14-18 K (''high-T c phase''). According to the report in 1969 by Krupka et al [1], the T c of Y 2 C 3 strongly depended on the synthesis conditions, and the highest value noted then was 11.5 K. Therefore, our low-T c phase samples appear to be the same as the conventional Y 2 C 3 sample investigated in the 1970s. The results of sample fabrications for Y 2 C 3 from each precursor are summarized in Table 1.…”

Section: Resultssupporting

confidence: 59%

“…Yttrium sesquicarbide, Y 2 C 3 , has long been recognized as a metallic superconductor with a high, over 10 K, superconducting transition temperature, T c , [1]. The highest T c of pure Y 2 C 3 was long ago determined as 11.5 K, while a higher T c (over 15 K, which was a very high value at that time) was reported for several related phases [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…The highest T c of pure Y 2 C 3 was long ago determined as 11.5 K, while a higher T c (over 15 K, which was a very high value at that time) was reported for several related phases [1][2][3]. However, Amano et al [4] recently found a high T c of 18 K for a pure unsubstituted Y 2 C 3 phase.…”

Section: Introductionmentioning

confidence: 99%

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Origin of the difference between the high and low-T_cphases in the yttrium sesquicarbide system

Akada

Hirai

Takeuchi

et al. 2006

Science and Technology of Advanced Materials

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The fabrication conditions of a high-pressure synthesis using a BN crucible have been established for the high-T c (T c 414 K) and the low-T c (T c o12 K) phases of the yttrium sesquicarbide (Y 2 C 3 ). The single-phase sample was synthesized from an arc-melted precursor. In contrast, Y 2 C 3 samples made from a powder precursor were not single-phase, although the reproducibilities of the high-T c phase and the highest value of T c were higher.The refinement results of neutron powder diffraction data for the high-and low-T c phases indicate a small difference between the two phases in the interatomic distance of the C-C dimer, while the lattice parameter was constant for all samples. The values of dT c /dP were measured for the high-T c phases (T c E15 K) and low-T c phases (T c E11 K) by a clamp cell technique detecting the AC susceptibility of the sample. The T c of Y 2 C 3 systematically changes with applied hydrostatic pressure for both phases. However, the trends for the dT c /dPs are opposite: the value for the high-T c phase is positive, and that for the low-T c phase is negative. From these results, we concluded that the difference between the high-T c and low-T c phases in our Y 2 C 3 samples did not originate in a simple contraction of the unit cell, but in the difference in the interatomic distances of the C-C dimers. r 2006 Published by NIMS and Elsevier Ltd.

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Section: Resultssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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Origin of the difference between the high and low-T_cphases in the yttrium sesquicarbide system

Akada

Hirai

Takeuchi

et al. 2006

Science and Technology of Advanced Materials

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“…Old examples from the literature are rare earth sesquicarbides, R 2 C 3−y , where R=La or Y. For instance Y 2 C 3−y displays a high T s = 18 K, but only weak spin-orbit coupling (Amano et al, 2004;Giorgi et al, 1970;Krupta et al, 1969). On a more general note we also mention that amorphous superconductors have no centre of inversion.…”

Section: A Non-centrosymmetric Superconductorsmentioning

confidence: 99%

Superconducting phases off-electron compounds

2009

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Intermetallic compounds containing f-electron elements display a wealth of superconducting phases, that are prime candidates for unconventional pairing with complex order parameter symmetries. For instance, superconductivity has been found at the border of magnetic order as well as deep within ferro-and antiferromagnetically ordered states, suggesting that magnetism may promote rather than destroy superconductivity. Superconductivity near valence transitions, or in the vicinity of magneto-polar order are candidates for new superconductive pairing interactions such as fluctuations of the conduction electron density or the crystal electric field, respectively. The experimental status of the study of the superconducting phases of f-electron compounds is reviewed.

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“…In this structure, Y atoms are aligned along the h111i direction and C atoms form dimers. The superconductivity of yttrium sesquicarbide was found by the Krupka group [7]. They claimed that phase composition has a significant effect on T c over the entire homogeneity range.…”

Section: Introductionmentioning

confidence: 96%

Superconductivity in Y₂C₃with mediumT_c

Akutagawa

Akimitsu

2006

Science and Technology of Advanced Materials

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Recently, we have reported a relatively high-T c superconductivity in Y 2 C 3 at 18 K whose T c could be changed by synthesis conditions from 10 to 18 K [G. Amano, S. Akutagawa, T. Muranaka, Y. Zenitani, J. Akimitsu, Superconductivity at 18 K in yttrium sesquicarbide system, Y 2 C 3 J. Phys. Soc. Jpn. 73 (2004) 530.]. We synthesized a high-purity sample of the medium-T c phase in Y 2 C 3 and examined its physical properties in detail. From a specific heat measurement, DC(T c )/gT c value is calculated to be 6.50 and the superconducting gap is estimated to be 2D/k B T c Z5.40, indicating that the superconductivity in Y 2 C 3 can be described by an s-wave strong coupling regime. q

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High pressure synthesis and superconducting properties of yttrium sesquicarbide

Cited by 80 publications

References 16 publications

Origin of the difference between the high and low-T_cphases in the yttrium sesquicarbide system

Origin of the difference between the high and low-T_cphases in the yttrium sesquicarbide system

Superconducting phases off-electron compounds

Superconductivity in Y₂C₃with mediumT_c

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High pressure synthesis and superconducting properties of yttrium sesquicarbide

Cited by 80 publications

References 16 publications

Origin of the difference between the high and low-Tcphases in the yttrium sesquicarbide system

Origin of the difference between the high and low-Tcphases in the yttrium sesquicarbide system

Superconducting phases off-electron compounds

Superconductivity in Y2C3with mediumTc

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Origin of the difference between the high and low-T_cphases in the yttrium sesquicarbide system

Origin of the difference between the high and low-T_cphases in the yttrium sesquicarbide system

Superconductivity in Y₂C₃with mediumT_c