40T Soft X-ray Spectroscopies on Magnetic-Field-Induced Valence Transition in Eu(Rh1-xIrx)2Si2 (x=0.3)

被引：4

作者：

Yasumura, Hiromasa ^{[1
]}

Narumi, Yasuo ^{[1
,5
]}

Nakamura, Tetsuya ^{[2
]}

Kotani, Yoshinori ^{[2
]}

Yasui, Akira ^{[2
]}

Kishaba, Eigo ^{[3
]}

Mitsuda, Akihiro ^{[3
]}

Wada, Hirofumi ^{[3
]}

Kindo, Koichi ^{[4
]}

Nojiri, Hiroyuki ^{[1
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Japan Synchrotron Radiat Res Inst, SPring 8, Sayo, Hyogo 6795198, Japan

[3] Kyushu Univ, Dept Phys, Fukuoka 8190395, Japan

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

[5] Osaka Univ, Grad Sch Sci, Ctr Adv High Magnet Field Sci, Toyonaka, Osaka 5600043, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2017年 / 86卷 / 05期

关键词：

CIRCULAR-DICHROISM; RARE-EARTH; ABSORPTION; EUPD2SI2; EUNI2(SI1-XGEX)(2); EUCU2SI2; SYSTEMS;

D O I：

10.7566/JPSJ.86.054706

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A magnetic-field-induced valence transition of Eu(Rh1-xIrx)(2)Si-2 (x = 0.3) has been examined using soft X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) measurements up to 39.3 T. At 9K, the Eu valence number takes a value of 2.65 (+/- 0.03) at 0 T and decreases abruptly to 2.33 (+/- 0.03) at the transition around 22 T. Above the transition field, the magnetization of the Eu2+ component saturates, although the Van Vleck paramagnetism of the Eu3+ linearly increases and reaches 0.65 mu(B)/Eu3+ at 39 T. The valence determined by XAS and the saturation value of the bulk magnetization are mutually consistent. It is found that the transition field determined by XMCD differs from that of the bulk magnetization. To interpret the discrepancy, we discuss the sample inhomogeneity and the effect of the surface state.

引用

页数：8

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