Two-dimensional magnetism in the pnictide superconductor parent material SrFeAsF probed by muon-spin relaxation

被引：19

作者：

Baker, P. J. ^{[1
]}

Franke, I. ^{[1
]}

Lancaster, T. ^{[1
]}

Blundell, S. J. ^{[1
]}

Kerslake, L. ^{[2
]}

Clarke, S. J. ^{[2
]}

机构：

[1] Univ Oxford, Clarendon Lab, Dept Phys, Oxford OX1 3PU, England

[2] Univ Oxford, Inorgan Chem Lab, Dept Chem, Oxford OX1 3QR, England

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

iron compounds; magnetic transitions; muon probes; solid-state phase transformations; specific heat; strontium compounds; superconducting materials;

D O I：

10.1103/PhysRevB.79.060402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report muon-spin relaxation measurements on SrFeAsF, which is the parent compound of an iron-arsenic- fluoride based series of superconducting materials. We find that this material has very similar magnetic properties to LaFeAsO, such as separated magnetic and structural transitions (T-N=122 K,T-s=175 K), contrasting with SrFe2As2 where they are coincident. The muon oscillation frequencies fall away very sharply at T-N [beta=0.22(3)], which suggests that the magnetic exchange between the layers is weaker than in comparable oxypnictide compounds. Our specific-heat measurements show that a small but distinct feature occurs at T-s. There is no anomaly evident at T-N as is typical for quasi-two-dimensional magnets. The magnetic entropy change between 100 and 185 K is Delta S=0.5 J mol(-1) K-1.

引用

页数：4

共 37 条

[1] Characteristic muon precession and relaxation signals in FeAs and FeAs2: Possible impurity phases in pnictide superconductors [J].

Baker, P. J. ;

Lewtas, H. J. ;

Blundell, S. J. ;

Lancaster, T. ;

Pratt, F. L. ;

Parker, D. R. ;

Pitcher, M. J. ;

Clarke, S. J. .

PHYSICAL REVIEW B, 2008, 78 (21)

[2]

BAKER PJ, ARXIV08112494

[3]

BAKER PJ, NEW J PHYS IN PRESS

[4] Spin-polarized muons in condensed matter physics [J].

Blundell, SJ .

CONTEMPORARY PHYSICS, 1999, 40 (03) :175-192

[5] OBSERVATION OF MUON-FLUORINE HYDROGEN-BONDING IN IONIC-CRYSTALS [J].

BREWER, JH ;

KREITZMAN, SR ;

NOAKES, DR ;

ANSALDO, EJ ;

HARSHMAN, DR ;

KEITEL, R .

PHYSICAL REVIEW B, 1986, 33 (11) :7813-7816

[6]

CARLO JP, PHYS REV LE IN PRESS

[7]

CARLO JP, ARXIV08052186

[8] Magnetic order of the iron spins in NdFeAsO [J].

Chen, Ying ;

Lynn, J. W. ;

Li, J. ;

Li, G. ;

Chen, G. F. ;

Luo, J. L. ;

Wang, N. L. ;

Dai, Pengcheng ;

dela Cruz, C. ;

Mook, H. A. .

PHYSICAL REVIEW B, 2008, 78 (06)

[9] Magnetic order close to superconductivity in the iron-based layered LaO1-xFxFeAs systems [J].

de la Cruz, Clarina ;

Huang, Q. ;

Lynn, J. W. ;

Li, Jiying ;

Ratcliff, W., II ;

Zarestky, J. L. ;

Mook, H. A. ;

Chen, G. F. ;

Luo, J. L. ;

Wang, N. L. ;

Dai, Pengcheng .

NATURE, 2008, 453 (7197) :899-902

[10]

DREW AJ, 14761122 NMAACR

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