Field-induced valence fluctuations in YbB12

被引：4

作者：

Kurihara, R. ^{[1
]}

Miyake, A. ^{[1
]}

Tokunaga, M. ^{[1
]}

Ikeda, A. ^{[1
]}

Matsuda, Y. H. ^{[1
]}

Miyata, A. ^{[2
,3
]}

Gorbunov, D., I ^{[2
,3
]}

Nomura, T. ^{[1
,2
,3
]}

Zherlitsyn, S. ^{[2
,3
]}

Wosnitza, J. ^{[2
,3
,4
]}

Iga, F. ^{[5
]}

机构：

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

[2] Helmholtz Zentrum Dresden Rossendorf, Hochfeld Magnetlab Dresden HLD EMFL, D-01328 Dresden, Germany

[3] Helmholtz Zentrum Dresden Rossendorf, Wurzburg Dresden Cluster Excellence Ct Qmat, D-01328 Dresden, Germany

[4] Tech Univ Dresden, Inst Festkorper & Mat Phys, D-01062 Dresden, Germany

[5] Ibaraki Univ, Inst Quantum Beam Sci, Mito, Ibaraki 3108512, Japan

来源：

PHYSICAL REVIEW B | 2021年 / 103卷 / 11期

关键词：

X-RAY SPECTROSCOPY; ELASTIC PROPERTIES; ELECTRON; STATE;

D O I：

10.1103/PhysRevB.103.115103

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We performed high-magnetic-field ultrasonic experiments on YbB12 up to 59 T to investigate the valence fluctuations in Yb ions. In zero field, the longitudinal elastic constant C-11, the transverse elastic constants C-44 and (C-11 - C-12)/2, and the bulk modulus C-B show a hardening with a change of curvature at around 35 K indicating a small contribution of valence fluctuations to the elastic constants. When high magnetic fields are applied at low temperatures, C-B exhibits a softening above a field-induced insulator-metal transition signaling field induced valence fluctuations. Furthermore, at elevated temperatures, the field-induced softening of C-B takes place at even lower fields and C-B decreases continuously with field. Our analysis using the multipole susceptibility based on a two-band model reveals that the softening of C-B originates from the enhancement of multipole-strain interaction in addition to the decrease of the insulator energy gap. This analysis indicates that field-induced valence fluctuations of Yb cause the instability of the bulk modulus C-B.

引用

页数：14

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