Evidence for Ferromagnetic Clusters in the Colossal-Magnetoresistance Material EuB6

被引：40

作者：

Pohlit, Merlin ^{[1
]}

Roessler, Sahana ^{[2
]}

Ohno, Yuzo ^{[3
,6
]}

Ohno, Hideo ^{[3
]}

von Molnar, Stephan ^{[4
]}

Fisk, Zachary ^{[5
]}

Mueller, Jens ^{[1
]}

Wirth, Steffen ^{[2
]}

机构：

[1] Goethe Univ Frankfurt, Inst Phys, D-60438 Frankfurt, Germany

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

[3] Tohoku Univ, Res Inst Elect Commun, Sendai, Miyagi 9808577, Japan

[4] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[5] Univ Calif Irvine, Dept Phys, Irvine, CA 92697 USA

[6] Univ Tsukuba, Fac Pure & Appl Sci, Tsukuba, Ibaraki, Japan

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 25期

关键词：

MAGNETIC POLARON FORMATION; PHASE-SEPARATION; ORDER;

D O I：

10.1103/PhysRevLett.120.257201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We combined scanning tunneling microscopy and locally resolved magnetic stray field measurements on the ferromagnetic semimetal EuB6, which exhibits a complex ferromagnetic order and a colossal magnetoresistance effect. In a zero magnetic field, scanning tunneling spectroscopy visualizes the existence of local inhomogeneities in the electronic density of states, which we interpret as the localization of charge carriers due to the formation of magnetic polarons. Micro-Hall magnetometry measurements of the total stray field emanating from the end of a rectangular-shaped platelike sample reveals evidence for magnetic clusters also in finite magnetic fields. In contrast, the signal detected below the faces of the magnetized sample measures a local stray field indicating the formation of pronounced magnetic inhomogeneities consistent with large clusters of percolated magnetic polarons.

引用

页数：5

共 33 条

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