Tunneling spectroscopy of the superconducting energy gap in RNi(2)B(2)C (R=Y and Lu)

被引：64

作者：

Ekino, T ^{[1
]}

Fujii, H ^{[1
]}

Kosugi, M ^{[1
]}

Zenitani, Y ^{[1
]}

Akimitsu, J ^{[1
]}

机构：

[1] AOYAMA GAKUIN UNIV,DEPT PHYS,TOKYO 157,JAPAN

来源：

PHYSICAL REVIEW B | 1996年 / 53卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.53.5640

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Superconducting energy gap in RNi(2)B(2)C (R=Y and Lu) has been investigated using a break-junction tunneling technique. The observed differential conductance dI/dV is well described by the BCS density of states with a small lifetime broadening parameter. We have found small gap values for the local low-T-c phases in addition to the bulk T-c of 15.6-16.6 K. The gap value of 2 Delta = 4.5 meV with T-c = 15 K gives the BCS ratio of 2 Delta/k(B)T(c) = 3.5, which is kept constant down to the observed lowest T-c of 4.6 K. These results give clear evidence for the BCS mechanism of superconductivity for these compounds.

引用

页码：5640 / 5649

页数：10

共 41 条

[1] TRANSITION FROM THE TUNNELING REGIME TO POINT CONTACT AND PROXIMITY-INDUCED JOSEPHSON EFFECT IN LEAD NORMAL-METAL NANOJUNCTIONS [J].

AGRAIT, N ;

RODRIGO, JG ;

VIEIRA, S .

PHYSICAL REVIEW B, 1992, 46 (09) :5814-5817

[2] SYNTHESIS OF YNI2B2C THIN-FILMS BY MAGNETRON SPUTTERING [J].

ARISAWA, S ;

HATANO, T ;

HIRATA, K ;

MOCHIKU, T ;

KITAGUCHI, H ;

FUJII, H ;

KUMAKURA, H ;

KADOWAKI, K ;

NAKAMURA, K ;

TOGANO, K .

APPLIED PHYSICS LETTERS, 1994, 65 (10) :1299-1301

[3] TRANSITION FROM METALLIC TO TUNNELING REGIMES IN SUPERCONDUCTING MICRO-CONSTRICTIONS - EXCESS CURRENT, CHARGE IMBALANCE, AND SUPER-CURRENT CONVERSION [J].

BLONDER, GE ;

TINKHAM, M ;

KLAPWIJK, TM .

PHYSICAL REVIEW B, 1982, 25 (07) :4515-4532

[4] EFFECT OF THE NI SITE SUBSTITUTION ON SUPERCONDUCTING PROPERTIES OF YNI2B2C [J].

BUDKO, SL ;

ELMASSALAMI, M ;

FONTES, MB ;

MONDRAGON, J ;

VANONI, W ;

GIORDANENGO, B ;

BAGGIOSAITOVITCH, EM .

PHYSICA C, 1995, 243 (1-2) :183-186

[5] ELECTRON-DENSITY OF STATES IN THE BOROCARBIDE INTERMETALLIC SUPERCONDUCTORS [J].

CARTER, SA ;

BATLOGG, B ;

CAVA, RJ ;

KRAJEWSKI, JJ ;

PECK, WF ;

TAKAGI, H .

PHYSICAL REVIEW B, 1994, 50 (06) :4216-4219

[6] SUPERCONDUCTIVITY AT 23-K IN YTTRIUM PALLADIUM BORIDE CARBIDE [J].

CAVA, RJ ;

TAKAGI, H ;

BATLOGG, B ;

ZANDBERGEN, HW ;

KRAJEWSKI, JJ ;

PECK, WF ;

VANDOVER, RB ;

FELDER, RJ ;

SIEGRIST, T ;

MIZUHASHI, K ;

LEE, JO ;

EISAKI, H ;

CARTER, SA ;

UCHIDA, S .

NATURE, 1994, 367 (6459) :146-148

[7] SUPERCONDUCTIVITY IN THE QUATERNARY INTERMETALLIC COMPOUNDS LNNI2B2C [J].

CAVA, RJ ;

TAKAGI, H ;

ZANDBERGEN, HW ;

KRAJEWSKI, JJ ;

PECK, WF ;

SIEGRIST, T ;

BATLOGG, B ;

VANDOVER, RB ;

FELDER, RJ ;

MIZUHASHI, K ;

LEE, JO ;

EISAKI, H ;

UCHIDA, S .

NATURE, 1994, 367 (6460) :252-253

[8] DIRECT MEASUREMENT OF QUASIPARTICLE-LIFETIME BROADENING IN A STRONG-COUPLED SUPERCONDUCTOR [J].

DYNES, RC ;

NARAYANAMURTI, V ;

GARNO, JP .

PHYSICAL REVIEW LETTERS, 1978, 41 (21) :1509-1512

[9] SUPERCONDUCTING ENERGY-GAP IN YNI2B2C [J].

EKINO, T ;

FUJII, H ;

KOSUGI, M ;

ZENITANI, Y ;

AKIMITSU, J .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1994, 235 :2529-2530

[10] TUNNELING EVIDENCE FOR THE QUASI-PARTICLE GAP IN KONDO SEMICONDUCTORS CENISN AND CERHSB [J].

EKINO, T ;

TAKABATAKE, T ;

TANAKA, H ;

FUJII, H .

PHYSICAL REVIEW LETTERS, 1995, 75 (23) :4262-4265

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