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Ivanovskii AL. Intermetallic borocarbides: electronic structure, chemical bonding, and properties. RUSSIAN CHEMICAL REVIEWS 2007. [DOI: 10.1070/rc1998v067n05abeh000404] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Raychaudhuri P, Jaiswal-Nagar D, Sheet G, Ramakrishnan S, Takeya H. Evidence of gap anisotropy in superconducting YNi2B2C using directional point-contact spectroscopy. PHYSICAL REVIEW LETTERS 2004; 93:156802. [PMID: 15524920 DOI: 10.1103/physrevlett.93.156802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2004] [Indexed: 05/24/2023]
Abstract
We present a study of the anisotropy in the superconducting energy gap in a single crystal of YNi2B2C (T(c) approximately 14.6 K) using directional point-contact spectroscopy. The superconducting energy gap at 2.7 K, when measured for I||c, is 4.5 times larger than that for I||a. The energy gaps in the two directions also have different temperature dependences. Our results support a scenario with s + g like symmetry.
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Affiliation(s)
- P Raychaudhuri
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India.
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Park T, Salamon MB, Choi EM, Kim HJ, Lee SI. Evidence for nodal quasiparticles in the nonmagnetic superconductor YNi2B2C via field-angle-dependent heat capacity. PHYSICAL REVIEW LETTERS 2003; 90:177001. [PMID: 12786095 DOI: 10.1103/physrevlett.90.177001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2002] [Indexed: 05/24/2023]
Abstract
Field-angle dependent heat capacity of the nonmagnetic borocarbide superconductor YNi2B2C reveals a clear fourfold oscillation, the first observation of its kind. The observed angular variations were analyzed as a function of magnetic field angle, field-intensity, and temperature to provide its origin. The quantitative agreement between experiment and theory strongly suggests that we are directly observing nodal quasiparticles generated along <100> by the Doppler effect. The results demonstrate that field-angle heat capacity can be a powerful tool in probing the momentum-space gap structure in unconventional superconductors such as high T(c) cuprates, heavy-fermion superconductors, etc.
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Affiliation(s)
- Tuson Park
- Department of Physics and Material Research Laboratory, University of Illinois at Urbana-Champaign, Illinois 61801, USA
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Izawa K, Kamata K, Nakajima Y, Matsuda Y, Watanabe T, Nohara M, Takagi H, Thalmeier P, Maki K. Gap function with point nodes in borocarbide superconductor YNi2B2C. PHYSICAL REVIEW LETTERS 2002; 89:137006. [PMID: 12225056 DOI: 10.1103/physrevlett.89.137006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2002] [Indexed: 05/23/2023]
Abstract
To determine the superconducting gap function of YNi2B2C, the c-axis thermal conductivity kappa(zz) was measured in H rotated in various directions. The angular variation of kappa(zz) in H rotated within the ab plane shows a peculiar fourfold oscillation with narrow cusps. The amplitude of this fourfold oscillation becomes very small when H is rotated conically around the c axis with a tilt angle of 45 degrees. These results provide the first compelling evidence that the gap function has point nodes located along the a and b axes. This unprecedented gap structure challenges the current view on the pairing mechanism.
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Affiliation(s)
- K Izawa
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Boaknin E, Hill RW, Proust C, Lupien C, Taillefer L, Canfield PC. Highly anisotropic gap function in borocarbide superconductor LuNi(2)B(2)C. PHYSICAL REVIEW LETTERS 2001; 87:237001. [PMID: 11736470 DOI: 10.1103/physrevlett.87.237001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2001] [Indexed: 05/23/2023]
Abstract
The thermal conductivity of borocarbide superconductor LuNi(2)B(2)C was measured down to 70 mK (T(c)/200) in a magnetic field perpendicular to the heat current from H = 0 to above H(c2) = 7 T. As soon as vortices enter the sample, the conduction at T-->0 grows rapidly, showing unambiguously that delocalized quasiparticles are present at the lowest energies. The field dependence is very similar to that of UPt(3), a heavy-fermion superconductor with a line of nodes in the gap, and very different from the exponential dependence characteristic of s-wave superconductors. This is strong evidence for a highly anisotropic gap function in LuNi(2)B(2)C, possibly with nodes.
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Affiliation(s)
- E Boaknin
- Canadian Institute for Advanced Research, Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
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Yokoya T, Kiss T, Watanabe T, Shin S, Nohara M, Takagi H, Oguchi T. Ultrahigh-resolution photoemission spectroscopy of Ni borocarbides: direct observation of the superconducting gap and a change in gap anisotropy by impurity. PHYSICAL REVIEW LETTERS 2000; 85:4952-4955. [PMID: 11102159 DOI: 10.1103/physrevlett.85.4952] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2000] [Indexed: 05/23/2023]
Abstract
We have performed ultrahigh-resolution photoemission spectroscopy of Y(Ni1-xPtx)2B2C ( x = 0.0 and 0.2) in order to study the changes in the density of states across the superconducting transition. Because of a drastic increase in energy resolution, we clearly observe the opening of superconducting gaps across T(c) in both compounds. Furthermore, we find a small but significant difference in the superconducting-state spectral shape. This can be explained in terms of reduction in gap anisotropy by introducing impurities and provides spectroscopic evidence for an anisotropic s-wave gap in YNi2B2C.
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Affiliation(s)
- T Yokoya
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Tominez E, Alleno E, Berger P, Bohn M, Mazumdar C, Godart C. Chemical and Superconducting Properties of the Quaternary Borocarbides Ln–M–B–C (Ln=rare earths, Y; M=Ni, Pd). J SOLID STATE CHEM 2000. [DOI: 10.1006/jssc.2000.8821] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Suh BJ, Borsa F, Torgeson DR, Cho BK, Canfield PC, Johnston DC, Rhee JY, Harmon BN. Electronic and magnetic properties of single-crystal YNi2B2C from 11B and 89Y NMR and magnetic-susceptibility measurements. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:15341-15351. [PMID: 9985599 DOI: 10.1103/physrevb.54.15341] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Michor H, Krendelsberger R, Hilscher G, Bauer E, Dusek C, Hauser R, Naber L, Werner D, Rogl P, Zandbergen HW. Superconducting properties of La3Ni2B2N3- delta. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:9408-9420. [PMID: 9984678 DOI: 10.1103/physrevb.54.9408] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Yatskar A, Budraa NK, Beyermann WP, Canfield PC, Bud'ko SL. Heavy-electron behavior in single-crystal YbNi2B2C. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R3772-R3775. [PMID: 9986369 DOI: 10.1103/physrevb.54.r3772] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Sera M, Kobayash S, Hiroi M, Kobayashi N, Takeya H, Kadowaki K. Thermal conductivity of RNi2B2C (R=Y,Ho) single crystals. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:3062-3065. [PMID: 9986201 DOI: 10.1103/physrevb.54.3062] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kobayashi K, Mizokawa T, Mamiya K, Sekiyama A, Fujimori A, Takagi H, Eisaki H, Uchida S, Cava RJ, Krajewski JJ, Peck WF. Photoemission study of Ni borocarbides: Superconducting YNi2B2C and nonsuperconducting LaNi2B2C. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:507-514. [PMID: 9984288 DOI: 10.1103/physrevb.54.507] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ekino T, Fujii H, Kosugi M, Zenitani Y, Akimitsu J. Tunneling spectroscopy of the superconducting energy gap in RNi2B2C (R=Y and Lu). PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:5640-5649. [PMID: 9984173 DOI: 10.1103/physrevb.53.5640] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Jeng FS, You YB, Ku HC, Ho JC. Superconducting and calorimetric properties of ThPt2B2C and the anomalous Tc variation for nonmagnetic RPt2B2C systems (R = Y, Th, La). PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:3492-3496. [PMID: 9983863 DOI: 10.1103/physrevb.53.3492] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Hoellwarth CC, Klavins P, Shelton RN. Heat-capacity and magnetic measurements on the Y(Ni2-xCox)B2C system. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:2579-2582. [PMID: 9983763 DOI: 10.1103/physrevb.53.2579] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Lynn JW, Huang Q, Santoro A, Cava RJ, Krajewski JJ, Peck WF. Nature of the magnetic order in superconducting and nonsuperconducting HoNi2-xCoxB2C. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:802-808. [PMID: 9983036 DOI: 10.1103/physrevb.53.802] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Shin S, Agui A, Watanabe M, Fujisawa M, Tezuka Y, Ishii T, Kobayashi K, Fujimori A, Hinomaru M, Takagi H. Soft-x-ray-emission studies of YNi2B2C and LaNi2B2C: Observation of the B 2p and C 2p partial density of states. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:15082-15085. [PMID: 9980856 DOI: 10.1103/physrevb.52.15082] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Michor H, Holubar T, Dusek C, Hilscher G. Specific-heat analysis of rare-earth transition-metal borocarbides: An estimation of the electron-phonon coupling strength. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:16165-16175. [PMID: 9981000 DOI: 10.1103/physrevb.52.16165] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Fisher IR, Cooper JR, Cava RJ. Normal-state transport and magnetic properties of RNi2B2C (R=Y, Ho, La). PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:15086-15089. [PMID: 9980857 DOI: 10.1103/physrevb.52.15086] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ravindran P, Sankaralingam S, Asokamani R. Electronic structure and phase-stability studies on superconducting YNi2B2C, YRh3B, and nonsuperconducting YNi4B. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:12921-12930. [PMID: 9980463 DOI: 10.1103/physrevb.52.12921] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Cho BK, Canfield PC, Miller LL, Johnston DC, Beyermann WP, Yatskar A. Magnetism and superconductivity in single-crystal ErNi2B2C. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:3684-3695. [PMID: 9981496 DOI: 10.1103/physrevb.52.3684] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kim H, Hwang CD, Ihm J. Ab initio pseudopotential calculations for the electronic structure of low-Tc LuNi2B2C and the related compound LuNiBC. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:4592-4596. [PMID: 9981596 DOI: 10.1103/physrevb.52.4592] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Lin MS, Shieh JH, You YB, Guan WY, Ku HC, Yang HD, Ho JC. Magnetic transitions and nearly reentrant superconducting properties of HoNi2B2C. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:1181-1186. [PMID: 9980698 DOI: 10.1103/physrevb.52.1181] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Jiang PJ, Lin MS, Shieh JH, You YB, Ku HC, Ho JC. Superconducting and calorimetric properties of the quaternary borocarbide superconductor LaPd2B2C. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:16436-16439. [PMID: 9978636 DOI: 10.1103/physrevb.51.16436] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Pellegrin E, Chen CT, Meigs G, Cava RJ, Krajewski JJ, Peck WF. Electronic structure of RNi2B2C (R=rare earth) from x-ray-absorption spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:16159-16163. [PMID: 9978598 DOI: 10.1103/physrevb.51.16159] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Carter SA, Batlogg B, Cava RJ, Krajewski JJ, Peck WF. Pressure effects and specific heat in superconducting HoNi2B2C. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:12644-12648. [PMID: 9978035 DOI: 10.1103/physrevb.51.12644] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Carter SA, Batlogg B, Cava RJ, Krajewski JJ, Peck WF. Magnetic and nonmagnetic Ce in the borocarbides. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:12829-12832. [PMID: 9978065 DOI: 10.1103/physrevb.51.12829] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Cava RJ, Siegrist T, Batlogg B, Takagi H, Eisaki H, Carter SA, Krajewski JJ, Peck WF. Elementary physical properties and crystal structures of LaRh2B2C and LaIr2B2C. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:12966-12968. [PMID: 9975466 DOI: 10.1103/physrevb.50.12966] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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