Mixed valence state of Ce ions in CeNi2Al3

被引：16

作者：

Coldea, M ^{[1
]}

Neumann, M

Pop, V

Demeter, M

机构：

[1] Univ Babes Bolyai, Fac Phys, R-3400 Cluj Napoca, Romania

[2] Univ Osnabruck, Fachbereich Phys, D-49069 Osnabruck, Germany

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2001年 / 323卷

关键词：

intermetallics; valence fluctuations; magnetic measurements; X-ray photoelectron spectroscopy;

D O I：

10.1016/S0925-8388(01)01104-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

X-ray photoelectron spectroscopy (XPS) and magnetic susceptibility (chi) of CeNi2Al3 and of the reference compound YNi2Al3 are reported. Both valence band and core level spectra were analyzed. The chi (T) curve of CeNi2Al3 shows a maximum around 22 K, characteristic for the intermediate valence state of Ce ions, and at high temperatures obeys a Curie-Weiss law with an effective magnetic moment mu (eff) = 2.48 mu (B)/f.u. The Ce 3d and 4d XPS spectra have confirmed the mixed valence state of Ce ions in CeNi2Al3. The f occupancy n(f) and coupling Delta between the f level and the conduction states are derived to be about 0.85 and 80 meV, respectively. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：431 / 434

页数：4

共 10 条

[1] ELECTRONIC-STRUCTURE OF CEN STUDIED BY X-RAY-PHOTOEMISSION SPECTROSCOPY [J].

BAER, Y ;

ZURCHER, C .

PHYSICAL REVIEW LETTERS, 1977, 39 (15) :956-959

[2]

Bates L.F., 1951, MODERN MAGNETISM

[3] ON THE MAGNETIC-BEHAVIOR OF ACO2 (A = Y, LU, ZR, SC AND HF) COMPOUNDS [J].

BURZO, E ;

GRATZ, E ;

POP, V .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1993, 123 (1-2) :159-164

[4] ON THE MAGNETIC-BEHAVIOR OF RCO2 COMPOUNDS WHERE R IS YTTRIUM OR A RARE-EARTH [J].

BURZO, E ;

LEMAIRE, R .

SOLID STATE COMMUNICATIONS, 1992, 84 (12) :1145-1148

[5] PHYSICAL-PROPERTIES OF SOME TERNARY CE INTERMETALLICS WITH THE TRANSITION-METALS NI AND PD [J].

CAVA, RJ ;

RAMIREZ, AP ;

TAKAGI, H ;

KRAJEWSKI, JJ ;

PECK, WF .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1993, 128 (1-2) :124-128

[6] Spin fluctuations in YNi5 and CeNi5 [J].

Coldea, M ;

Andreica, D ;

Bitu, M ;

Crisan, V .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1996, 157 :627-628

[7] ELECTRONIC-STRUCTURE OF CE AND ITS INTERMETALLIC COMPOUNDS [J].

FUGGLE, JC ;

HILLEBRECHT, FU ;

ZOLNIEREK, Z ;

LASSER, R ;

FREIBURG, C ;

GUNNARSSON, O ;

SCHONHAMMER, K .

PHYSICAL REVIEW B, 1983, 27 (12) :7330-7341

[8] ELECTRON SPECTROSCOPIES FOR CE COMPOUNDS IN THE IMPURITY MODEL [J].

GUNNARSSON, O ;

SCHONHAMMER, K .

PHYSICAL REVIEW B, 1983, 28 (08) :4315-4341

[9] SURFACE AND BULK PROPERTIES OF CERIUM ATOMS IN SEVERAL CERIUM INTERMETALLIC COMPOUNDS - XPS AND X-RAY ABSORPTION-MEASUREMENTS [J].

KRILL, G ;

KAPPLER, JP ;

MEYER, A ;

ABADLI, L ;

RAVET, MF .

JOURNAL OF PHYSICS F-METAL PHYSICS, 1981, 11 (08) :1713-1725

[10] STUDY OF SOME CE INTERMETALLICS BY CORE-LEVEL PHOTOEMISSION [J].

SINGHAL, RK ;

SAINI, NL ;

GARG, KB ;

KANSKI, J ;

ILVER, L ;

NILSSON, PO ;

KUMAR, R ;

GUPTA, LC .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1993, 5 (24) :4013-4020

← 1 →