Breakup of heavy fermions on the brink of "phase A" in CeCu2Si2

被引：148

作者：

Gegenwart, P ^{[1
]}

Langhammer, C

Geibel, C

Helfrich, R

Lang, M

Sparn, G

Steglich, F

Horn, R

Donnevert, L

Link, A

Assmus, W

机构：

[1] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[2] Tech Univ Darmstadt, Inst Solid State Phys, D-64289 Darmstadt, Germany

[3] Goethe Univ Frankfurt, Inst Phys, D-60325 Frankfurt, Germany

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.81.1501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report resistivity, p(T), and specific-heat, C(T), results on near stoichiometric CeCu2Si2 samples, in the vicinity of a quantum critical point (QCP). The latter is defined by T-A --> 0, where T-A less than or similar to 0.8 K marks the transition into a spin-density-wave-type "phase A" which competes with heavy-fermion superconductivity below T-c approximate to 0.65 K. Upon approaching the QCP, p(T) and C(T) behave very disparately, suggesting a breakup of the heavy quasiparticles. Very surprising observations are being made for samples with T-A > 0 also.

引用

页码：1501 / 1504

页数：4

共 28 条

[1] A re-examination of concepts in magnetic metals: The 'nearly antiferromagnetic Fermi liquid' [J].

Anderson, PW .

ADVANCES IN PHYSICS, 1997, 46 (01) :3-11

[2] HEAT-CAPACITY MEASUREMENTS ON SMALL SAMPLES AT LOW-TEMPERATURES [J].

BACHMANN, R ;

SCHWALL, RE ;

THOMAS, HU ;

ZUBECK, RB ;

KING, CN ;

KIRSCH, HC ;

DISALVO, FJ ;

GEBALLE, TH ;

LEE, KN ;

HOWARD, RE ;

GREENE, RL .

REVIEW OF SCIENTIFIC INSTRUMENTS, 1972, 43 (02) :205-&

[3] UNUSUAL B-T PHASE-DIAGRAM OF THE HEAVY-FERMION SUPERCONDUCTOR CECU2SI2 [J].

BRULS, G ;

WOLF, B ;

FINSTERBUSCH, D ;

THALMEIER, P ;

KOUROUDIS, I ;

SUN, W ;

ASSMUS, W ;

LUTHI, B ;

LANG, M ;

GLOOS, K ;

STEGLICH, F ;

MODLER, R .

PHYSICAL REVIEW LETTERS, 1994, 72 (11) :1754-1757

[4] KNIGHT-SHIFTS AND NUCLEAR-SPIN-RELAXATION RATES FOR 2-DIMENSIONAL MODELS OF CUO2 [J].

BULUT, N ;

HONE, DW ;

SCALAPINO, DJ ;

BICKERS, NE .

PHYSICAL REVIEW B, 1990, 41 (04) :1797-1811

[5] UNUSUAL GROUND-STATE PROPERTIES OF UPD2AL3 - IMPLICATIONS FOR THE COEXISTENCE OF HEAVY-FERMION SUPERCONDUCTIVITY AND LOCAL-MOMENT ANTIFERROMAGNETISM [J].

CASPARY, R ;

HELLMANN, P ;

KELLER, M ;

SPARN, G ;

WASSILEW, C ;

KOHLER, R ;

GEIBEL, C ;

SCHANK, C ;

STEGLICH, F ;

PHILLIPS, NE .

PHYSICAL REVIEW LETTERS, 1993, 71 (13) :2146-2149

[6] Local moments in an interacting environment [J].

Coleman, P ;

Tsvelik, AM .

PHYSICAL REVIEW B, 1998, 57 (20) :12757-12762

[7] On the competition between superconductivity and magnetism in CeCu2Si2 [J].

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. .

PHYSICA B-CONDENSED MATTER, 1995, 206 :596-599

[8] Non-Fermi-liquid behavior in CeCu2Si2 at the disappearance of the presumably magnetically ordered ''A-phase'' [J].

Gegenwart, P ;

Lohmann, M ;

Lang, M ;

Helfrich, R ;

Langhammer, C ;

Koppen, M ;

Geibel, C ;

Steglich, F ;

Assmus, W .

PHYSICA B-CONDENSED MATTER, 1997, 230 :572-575

[9]

GEGENWART P, IN PRESS P SCES 98 P

[10]

GEGENWART P, 1997, THESIS TU DARMSTADT

← 1 2 3 →