High-Magnetic-Field X-ray Absorption and Magnetic Circular Dichroism Spectroscopy in the Mixed-Valent Compound YbAgCu4

被引：11

作者：

Nakamura, Toshiyuki ^{[1
]}

Matsuda, Yasuhiro H. ^{[1
]}

Her, Jim-Long ^{[1
]}

Kindo, Koichi ^{[1
]}

Michimura, Shinji ^{[2
]}

Inami, Toshiya ^{[2
]}

Mizumaki, Masaichiro ^{[3
]}

Kawamura, Naomi ^{[3
]}

Suzuki, Motohiro ^{[3
]}

Chen, Bin ^{[4
]}

Ohta, Hiroto ^{[4
]}

Yoshimura, Kazuyoshi ^{[4
]}

Kotani, Akio ^{[5
,6
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[2] Japan Atom Energy Agcy, Condensed Matter Sci Div, Sayo, Hyogo 6795148, Japan

[3] SPring 8 JASRI, Sayo, Hyogo 6795198, Japan

[4] Kyoto Univ, Grad Sch Sci, Dept Chem, Kyoto 6068502, Japan

[5] High Energy Accelerator Res Org, Photon Factory, Tsukuba, Ibaraki 3050801, Japan

[6] RIKEN, Harima Inst, Sayo, Hyogo 6795148, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2012年 / 81卷 / 11期

基金：

日本学术振兴会;

关键词：

synchrotron x-ray absorption; x-ray magnetic circular dichroism; valence transition; heavy fermion; high magnetic fields; metamagnetism; PHASE-TRANSITION; AG; YBXIN1-XCU2; YBXCU4; EDGES;

D O I：

10.1143/JPSJ.81.114702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The X-ray absorption and magnetic circular dichroism (XMCD) spectra at the L-3 edge of Yb have been studied experimentally as well as theoretically in the mixed-valent heavy fermion compound YbAgCu4 at high magnetic fields and low temperatures. It has been found that the absorption spectra depend on the temperature as well as the magnetic field, suggesting a significant change in valence with the temperature and magnetic field. The magnetic field-temperature (H-T) phase boundary determined by the valence state is in very good agreement with that determined by the magnetization. It is clearly found that the metamagnetism of this compound is due to the field-induced valence transition. A distinct positive peak of the XMCD spectra appears in the vicinity of the white line of the absorption due to the Yb3+ state, while no feature is observed in the XMCD spectra corresponding to the Yb2+ state. On the other hand, a small negative XMCD peak was observed at a lower energy and the magnetic field dependence of the negative XMCD intensity was found to be qualitatively different from that of the main XMCD signal near the white line. By theoretical calculation, the quadrupole transition is found to explain the energy position and its peculiar magnetic field dependence.

引用

页数：11

共 27 条

[1] STUDY OF 5D MAGNETISM IN RARE-EARTH TRANSITION-METAL (FE, CO) INTERMETALLIC COMPOUNDS BY MAGNETIC CIRCULAR X-RAY DICHROISM [J].

BAUDELET, F ;

GIORGETTI, C ;

PIZZINI, S ;

BROUDER, C ;

DARTYGE, E ;

FONTAINE, A ;

KAPPLER, JP ;

KRILL, G .

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 1993, 62 (1-2) :153-166

[2] α-γ transition in metallic Ce studied by resonant x-ray spectroscopies -: art. no. 085112 [J].

Dallera, C ;

Grioni, M ;

Palenzona, A ;

Taguchi, M ;

Annese, E ;

Ghiringhelli, G ;

Tagliaferri, A ;

Brookes, NB ;

Neisius, T ;

Braicovich, L .

PHYSICAL REVIEW B, 2004, 70 (08) :085112-1

[3] New spectroscopy solves an old puzzle:: The Kondo scale in heavy fermions -: art. no. 196403 [J].

Dallera, C ;

Grioni, M ;

Shukla, A ;

Vankó, G ;

Sarrao, JL ;

Rueff, JP ;

Cox, DL .

PHYSICAL REVIEW LETTERS, 2002, 88 (19) :1964031-1964034

[4] 1ST-ORDER VALENCE PHASE-TRANSITION IN CUBIC YBXIN1-XCU2 [J].

FELNER, I ;

NOWIK, I .

PHYSICAL REVIEW B, 1986, 33 (01) :617-619

[5] YTTERBIUM VALENCE PHASE-TRANSITION IN YBXIN1-XCU2 [J].

FELNER, I ;

NOWIK, I ;

VAKNIN, D ;

POTZEL, U ;

MOSER, J ;

KALVIUS, GM ;

WORTMANN, G ;

SCHMIESTER, G ;

HILSCHER, G ;

GRATZ, E ;

SCHMITZER, C ;

PILLMAYR, N ;

PRASAD, KG ;

DEWAARD, H ;

PINTO, H .

PHYSICAL REVIEW B, 1987, 35 (13) :6956-6963

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

GUNNARSSON, O ;

SCHONHAMMER, K .

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

[7] Magnetic-field, pressure, and temperature scaling of the first-order valence transition in pure and doped YbInCu4 [J].

Immer, CD ;

Sarrao, JL ;

Fisk, Z ;

Lacerda, A ;

Mielke, C ;

Thompson, JD .

PHYSICAL REVIEW B, 1997, 56 (01) :71-74

[8] Theoretical analysis of X-ray magnetic circular dichroism at the Yb L2, 3 absorption edges of YbInCu4 in high magnetic fields around the field-induced valence transition [J].

Kotani, A. .

EUROPEAN PHYSICAL JOURNAL B, 2012, 85 (01)

[9] Crystal field effect on X-ray magnetic circular dichroism spectra at the L2,3 absorption edges of mixed-valence Ce and Yb compounds in high magnetic fields [J].

Kotani, A. .

EUROPEAN PHYSICAL JOURNAL B, 2011, 81 (01) :49-62

[10]

Koyama T, 2002, PHYS REV B, V66, DOI 10.1103/PhysRevB.66.014420

← 1 2 3 →