Non-Fermi-liquid behavior in CeCu2Si2 at the disappearance of the presumably magnetically ordered ''A-phase''

被引：12

作者：

Gegenwart, P ^{[1
]}

Lohmann, M ^{[1
]}

Lang, M ^{[1
]}

Helfrich, R ^{[1
]}

Langhammer, C ^{[1
]}

Koppen, M ^{[1
]}

Geibel, C ^{[1
]}

Steglich, F ^{[1
]}

Assmus, W ^{[1
]}

机构：

[1] UNIV FRANKFURT, INST PHYS, D-60054 FRANKFURT, GERMANY

来源：

PHYSICA B-CONDENSED MATTER | 1997年 / 230卷

关键词：

CeCu2Si2; heavy-fermion superconductivity; non-Fermi liquid system; magnetic correlation;

D O I：

10.1016/S0921-4526(96)00750-8

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We present transport and thermodynamic measurements on two high-quality single crystals of CeCu2Si2 with different ground-state properties crystal #1 (''A/S''-type) shows a competition of superconductivity and a presumably magnetically ordered ''A-phase''. The latter develops out of a low-temperature state where the resistivity varies as rho - rho(0) = aT(2) indicative of a coherent heavy Fermi liquid. By contrast, non-Fermi-liquid behavior is found for crystal #2 (''S''-type) which lacks the A-phase for B < 5 T.

引用

页码：572 / 575

页数：4

共 17 条

[1] OBSERVATION OF A HIGH-FIELD ANOMALY IN THE LOW-TEMPERATURE SPECIFIC-HEAT OF CECU2SI2
ANDRAKA, B
STEWART, GR
STEGLICH, F
[J]. PHYSICAL REVIEW B, 1993, 48 (06): : 3939 - 3942
[2] UNUSUAL B-T PHASE-DIAGRAM OF THE HEAVY-FERMION SUPERCONDUCTOR CECU2SI2
BRULS, G
WOLF, B
FINSTERBUSCH, D
THALMEIER, P
KOUROUDIS, I
SUN, W
ASSMUS, W
LUTHI, B
LANG, M
GLOOS, K
STEGLICH, F
MODLER, R
[J]. PHYSICAL REVIEW LETTERS, 1994, 72 (11) : 1754 - 1757
[3] QUANTUM SCALING IN MANY-BODY SYSTEMS
CONTINENTINO, MA
[J]. PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 1994, 239 (03): : 179 - 213
[4] On the competition between superconductivity and magnetism in CeCu2Si2
Feyerherm, R.
Amato, A.
Geibel, C.
Gygax, F. N.
Hellmann, P.
Heffner, R. H.
MacLaughlin, D. E.
Mueller-Reisener, R.
Nieuwenhuys, G. J.
Schenck, A.
Steglich, F.
[J]. PHYSICA B-CONDENSED MATTER, 1995, 206 : 596 - 599
[5] HELFRICH R, 1996, THESIS TH DARMSTADT
[6] Pressure studies of quantum critical effects in CeCu2Si2 and CeNi2Ge2
Hellmann, P
Donnevert, L
Thomas, S
Geibel, C
Sparn, G
Steglich, F
[J]. CZECHOSLOVAK JOURNAL OF PHYSICS, 1996, 46 : 2591 - 2592
[7] COOPERATIVE EFFECTS IN CECU2SI2
LANG, M
MODLER, R
AHLHEIM, U
HELFRICH, R
REINDERS, PHP
STEGLICH, F
ASSMUS, W
SUN, W
BRULS, G
WEBER, D
LUTHI, B
[J]. PHYSICA SCRIPTA, 1991, T39 : 135 - 139
[8] LONZARICH GG, 1994, UNPUB
[9] EFFECT OF A NONZERO TEMPERATURE ON QUANTUM CRITICAL-POINTS IN ITINERANT FERMION SYSTEMS
MILLIS, AJ
[J]. PHYSICAL REVIEW B, 1993, 48 (10): : 7183 - 7196
[10] The effect of composition on the occurrence of a second phase transition in the vicinity of T-c in CeCu2Si2
Modler, R.
Lang, M.
Geibel, C.
Schank, C.
Mueller-Reisener, R.
Hellmann, P.
Link, A.
Sparn, G.
Assmus, W.
Steglich, F.
[J]. PHYSICA B-CONDENSED MATTER, 1995, 206 : 586 - 588

← 1 2 →