ELECTRON-DENSITY OF STATES IN THE BOROCARBIDE INTERMETALLIC SUPERCONDUCTORS

被引：102

作者：

CARTER, SA ^{[1
]}

BATLOGG, B ^{[1
]}

CAVA, RJ ^{[1
]}

KRAJEWSKI, JJ ^{[1
]}

PECK, WF ^{[1
]}

TAKAGI, H ^{[1
]}

机构：

[1] UNIV TOKYO,TOKYO 113,JAPAN

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.50.4216

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present heat-capacity measurements in a magnetic field up to 7.7 T on the recently discovered borocarbide intermetallic superconductors LuNi2B2C and LaPt1.7Au0.3B2C. For LuNi2B2C with T(c) = 16.5 K, we find a large density of states at the Fermi level, gamma approximately 19(2) mJ/mole K2, and an effective Debye temperature THETA(D) of 345 K. In comparison, LaPt1.7Au0.3B2C, with T(c) = 10.2 K, has a gamma of 7.5(1.5) mJ/mole K2 and a smaller Debye temperature THETA(D) of 220 K. Through comparison with the specific-heat anomaly at T(c), DELTAC/gammaT(c), the magnetic susceptibility, and the calculated band structure, these compounds are found to be in the weak-to-intermediate coupling limit with lambda = 0.5-1.0. Their position on the gamma-T(c) plot indicates dominant phonon-mediated electron pairing.

引用

页码：4216 / 4219

页数：4

共 12 条

[1] 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

[2] 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

[3] SUPERCONDUCTIVITY IN RPT2B2C [J].

CAVA, RJ ;

BATLOGG, B ;

SIEGRIST, T ;

KRAJEWSKI, JJ ;

PECK, WF ;

CARTER, S ;

FELDER, RJ ;

TAKAGI, H ;

VANDOVER, RB .

PHYSICAL REVIEW B, 1994, 49 (17) :12384-12387

[4]

CAVA RJ, IN PRESS PHYSICA C

[5] ELECTRONIC-PROPERTIES OF SUPERCONDUCTING LUNI2B2C AND RELATED BORIDE CARBIDE PHASES [J].

MATTHEISS, LF .

PHYSICAL REVIEW B, 1994, 49 (18) :13279-13282

[6]

MATTHEISS LF, COMMUNICATION

[7] BULK SUPERCONDUCTIVITY AT AN ELEVATED-TEMPERATURE (T(C)APPROXIMATE-TO-12-K) IN A NICKEL-CONTAINING ALLOY SYSTEM Y-NI-B-C [J].

NAGARAJAN, R ;

MAZUMDAR, C ;

HOSSAIN, Z ;

DHAR, SK ;

GOPALAKRISHNAN, KV ;

GUPTA, LC ;

GODART, C ;

PADALIA, BD ;

VIJAYARAGHAVAN, R .

PHYSICAL REVIEW LETTERS, 1994, 72 (02) :274-277

[8] LUNI2B2C - A NOVEL NI-BASED STRONG-COUPLING SUPERCONDUCTOR [J].

PICKETT, WE ;

SINGH, DJ .

PHYSICAL REVIEW LETTERS, 1994, 72 (23) :3702-3705

[9] THE CRYSTAL-STRUCTURE OF SUPERCONDUCTING LUNI2B2C AND THE RELATED PHASE LUNIBC [J].

SIEGRIST, T ;

ZANDBERGEN, HW ;

CAVA, RJ ;

KRAJEWSKI, JJ ;

PECK, WF .

NATURE, 1994, 367 (6460) :254-256

[10] SPECIFIC-HEAT OF Y0.7TH0.3C1.58 [J].

STEWART, GR ;

GIORGI, AL ;

KRUPKA, MC .

SOLID STATE COMMUNICATIONS, 1978, 27 (04) :413-416

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