Structural transformation induced by magnetic field and "colossal-like" magnetoresistance response above 313 K in MnAs

被引：106

作者：

Mira, J ^{[1
]}

Rivadulla, F

Rivas, J

Fondado, A

Guidi, T

Caciuffo, R

Carsughi, F

Radaelli, PG

Goodenough, JB

机构：

[1] Univ Santiago de Compostela, Dept Fis Aplicada, E-15782 Santiago De Compostela, Spain

[2] Univ Texas, Texas Mat Inst, Austin, TX 78712 USA

[3] Univ Ancona, Dipartimento Fis, Ist Nazl Fis Mat, I-60132 Ancona, Italy

[4] UCL, Dept Phys & Astron, London WC1E 6BT, England

[5] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.90.097203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

MnAs exhibits a first-order phase transition from a ferromagnetic, high-spin metal hexagonal phase to a paramagnetic, lower-spin insulator orthorhombic phase at T-C=313 K. Here, we report the results of neutron diffraction experiments showing that an external magnetic field, B, stabilizes the hexagonal phase above T-C. The phase transformation is reversible and constitutes the first demonstration of a bond-breaking transition induced by a magnetic field. The field-induced phase transition is accompanied by an enhanced magnetoresistance of about 17% at 310 K. The phenomenon appears to be similar to that of the colossal magnetoresistance response observed in the Mg perovskite family.

引用

页数：4

共 27 条

[1] A STRUCTURAL PHASE-TRANSITION INDUCED BY AN EXTERNAL MAGNETIC-FIELD [J].

ASAMITSU, A ;

MORITOMO, Y ;

TOMIOKA, Y ;

ARIMA, T ;

TOKURA, Y .

NATURE, 1995, 373 (6513) :407-409

[2] The specific heats of ferromagnetic substances [J].

Bates, LF .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-CONTAINING PAPERS OF A MATHEMATICAL AND PHYSICAL CHARACTER, 1928, 117 (778) :680-691

[3]

Bates LF, 1929, PHILOS MAG, V8, P714

[4] MAGNETIC DISORDER AS A FIRST-ORDER PHASE TRANSFORMATION [J].

BEAN, CP ;

RODBELL, DS .

PHYSICAL REVIEW, 1962, 126 (01) :104-+

[5] Giant magnetoelastic response in MnAs [J].

Chernenko, VA ;

Wee, L ;

McCormick, PG ;

Street, R .

JOURNAL OF APPLIED PHYSICS, 1999, 85 (11) :7833-7837

[6] Mixed-valence manganites [J].

Coey, JMD ;

Viret, M ;

von Molnár, S .

ADVANCES IN PHYSICS, 1999, 48 (02) :167-293

[7] MAGNETIC FIRST-ORDER PHASE TRANSITION IN SINGLE-CRYSTAL MNAS [J].

DEBLOIS, RW ;

RODBELL, DS .

PHYSICAL REVIEW, 1963, 130 (04) :1347-+

[8] Evidence for magnetic polarons in the magnetoresistive perovskites [J].

DeTeresa, JM ;

Ibarra, MR ;

Algarabel, PA ;

Ritter, C ;

Marquina, C ;

Blasco, J ;

Garcia, J ;

delMoral, A ;

Arnold, Z .

NATURE, 1997, 386 (6622) :256-259

[9] HIGH-PRESSURE STUDY OF FIRST-ORDER PHASE TRANSITION IN MNAS [J].

GOODENOU.JB ;

KAFALAS, JA .

PHYSICAL REVIEW, 1967, 157 (02) :389-&

[10] Colossal magnetoresistance in Ln1-xAxMnO3 perovskites [J].

Goodenough, JB .

AUSTRALIAN JOURNAL OF PHYSICS, 1999, 52 (02) :155-186

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