Charge dynamics and possibility of ferromagnetism in A1-xLaxB6 (A=Ca and Sr)

K. Taniguchi; T. Katsufuji; F. Sakai; H. Ueda; K. Kitazawa; H. Takagi

Charge dynamics and possibility of ferromagnetism in A_1-xLa_xB₆ (A=Ca and Sr)

K. Taniguchi^*, T. Katsufuji, F. Sakai, H. Ueda, K. Kitazawa, H. Takagi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

Ferromagnetism was recently reported in La-doped alkaline-earth hexaborides A_1-xLa_xB₆ (A = Ca, Sr, and Ba). We have performed reflectivity, Hall resistivity, and magnetization measurements of A_1-xLa_xB6. The results indicate that A₁-xLa_xB₆ can be regarded as a simple doped semimetal, with no signature of an excitonic state as suggested by several theories. It is also found that the surface of as-grown samples (∼ 10 μm in thickness) has a different electronic structure from a bulk one, and a fairly large number of paramagnetic moments are confined in this region. After eliminating these paramagnetic moments at the surface, we could not find any evidence of an intrinsic ferromagnetic moment in our samples, implying the possibility that the ferromagnetism of A_1-xLa_xB₆ reported so far is not intrinsic.

Original language	English
Article number	064407
Pages (from-to)	644071-644077
Number of pages	7
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	66
Issue number	6
Publication status	Published - 2002 Aug 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

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title = "Charge dynamics and possibility of ferromagnetism in A1-xLaxB6 (A=Ca and Sr)",

abstract = "Ferromagnetism was recently reported in La-doped alkaline-earth hexaborides A1-xLaxB6 (A = Ca, Sr, and Ba). We have performed reflectivity, Hall resistivity, and magnetization measurements of A1-xLaxB6. The results indicate that A1-xLaxB6 can be regarded as a simple doped semimetal, with no signature of an excitonic state as suggested by several theories. It is also found that the surface of as-grown samples (∼ 10 μm in thickness) has a different electronic structure from a bulk one, and a fairly large number of paramagnetic moments are confined in this region. After eliminating these paramagnetic moments at the surface, we could not find any evidence of an intrinsic ferromagnetic moment in our samples, implying the possibility that the ferromagnetism of A1-xLaxB6 reported so far is not intrinsic.",

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T1 - Charge dynamics and possibility of ferromagnetism in A1-xLaxB6 (A=Ca and Sr)

AU - Taniguchi, K.

AU - Katsufuji, T.

AU - Sakai, F.

AU - Ueda, H.

AU - Kitazawa, K.

AU - Takagi, H.

PY - 2002/8/1

Y1 - 2002/8/1

N2 - Ferromagnetism was recently reported in La-doped alkaline-earth hexaborides A1-xLaxB6 (A = Ca, Sr, and Ba). We have performed reflectivity, Hall resistivity, and magnetization measurements of A1-xLaxB6. The results indicate that A1-xLaxB6 can be regarded as a simple doped semimetal, with no signature of an excitonic state as suggested by several theories. It is also found that the surface of as-grown samples (∼ 10 μm in thickness) has a different electronic structure from a bulk one, and a fairly large number of paramagnetic moments are confined in this region. After eliminating these paramagnetic moments at the surface, we could not find any evidence of an intrinsic ferromagnetic moment in our samples, implying the possibility that the ferromagnetism of A1-xLaxB6 reported so far is not intrinsic.

AB - Ferromagnetism was recently reported in La-doped alkaline-earth hexaborides A1-xLaxB6 (A = Ca, Sr, and Ba). We have performed reflectivity, Hall resistivity, and magnetization measurements of A1-xLaxB6. The results indicate that A1-xLaxB6 can be regarded as a simple doped semimetal, with no signature of an excitonic state as suggested by several theories. It is also found that the surface of as-grown samples (∼ 10 μm in thickness) has a different electronic structure from a bulk one, and a fairly large number of paramagnetic moments are confined in this region. After eliminating these paramagnetic moments at the surface, we could not find any evidence of an intrinsic ferromagnetic moment in our samples, implying the possibility that the ferromagnetism of A1-xLaxB6 reported so far is not intrinsic.

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ER -

Charge dynamics and possibility of ferromagnetism in A_1-xLa_xB₆ (A=Ca and Sr)

Abstract

ASJC Scopus subject areas

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