Strongly enhanced magnetic fluctuations in a large-mass layered ruthenate

被引：31

作者：

Friedt, O

Steffens, P

Braden, M

Sidis, Y

Nakatsuji, S

Maeno, Y

机构：

[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[2] CEA CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

[3] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[4] Kyoto Univ, Int Innovat Ctr, Kyoto 6068502, Japan

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.93.147404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied the magnetic excitations in Ca2-xSrxRuO4, x=0.52 and 0.62, which exhibit an anomalously high susceptibility and heavy mass Fermi liquid behavior. Our inelastic neutron scattering experiments reveal strongly enhanced magnetic fluctuations around an incommensurate wave-vector (0.22,0,0) pointing to a magnetic instability. The magnetic fluctuations show no correlation in the c direction and also along the RuO2 planes the signal is extremely broad, Deltaq=0.45 Angstrom(-1). These fluctuations can quantitatively account for the high specific heat coefficient and relate to the high macroscopic susceptibility. The magnetic scattering is attributed to the d(xy) band, the active band for spin triplet superconductivity in Sr2RuO4.

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页码：147404 / 1

页数：4

相关论文

共 26 条

[1] Orbital-selective Mott-insulator transition in Ca2-xSrxRuO4 [J].

Anisimov, VI ;

Nekrasov, IA ;

Kondakov, DE ;

Rice, TM ;

Sigrist, M .

EUROPEAN PHYSICAL JOURNAL B, 2002, 25 (02) :191-201

[2] Inelastic neutron scattering study of magnetic excitations in Sr2RuO4 -: art. no. 064522 [J].

Braden, M ;

Sidis, Y ;

Bourges, P ;

Pfeuty, P ;

Kulda, J ;

Mao, Z ;

Maeno, Y .

PHYSICAL REVIEW B, 2002, 66 (06) :645221-6452211

[3] Structural stability of Sr2RuO4 [J].

Braden, M ;

Reichardt, W ;

Nishizaki, S ;

Mori, Y ;

Maeno, Y .

PHYSICAL REVIEW B, 1998, 57 (02) :1236-1240

[4] Crystal and magnetic structure of Ca2RuO4:: Magnetoelastic coupling and the metal-insulator transition [J].

Braden, M ;

Andre, G ;

Nakatsuji, S ;

Maeno, Y .

PHYSICAL REVIEW B, 1998, 58 (02) :847-861

[5] Observation of two-dimensional spin fluctuations in the bilayer ruthenate Sr3Ru2O7 by inelastic neutron scattering -: art. no. 012504 [J].

Capogna, L ;

Forgan, EM ;

Hayden, SM ;

Wildes, A ;

Duffy, JA ;

Mackenzie, AP ;

Perry, RS ;

Ikeda, S ;

Maeno, Y ;

Brown, SP .

PHYSICAL REVIEW B, 2003, 67 (01)

[6] Structure and thermal expansion of LiV2O4: Correlation between structure and heavy fermion behavior [J].

Chmaissem, O ;

Jorgensen, JD ;

Kondo, S ;

Johnston, DC .

PHYSICAL REVIEW LETTERS, 1997, 79 (24) :4866-4869

[7] Magnetic phase diagram of Ca2-xSrxRuO4 governed by structural distortions -: art. no. 020509 [J].

Fang, Z ;

Terakura, K .

PHYSICAL REVIEW B, 2001, 64 (02)

[8] Structural and magnetic aspects of the metal-insulator transition in Ca2-xSrxRuO4 -: art. no. 174432 [J].

Friedt, O ;

Braden, M ;

André, G ;

Adelmann, P ;

Nakatsuji, S ;

Maeno, Y .

PHYSICAL REVIEW B, 2001, 63 (17) :1744321-17443210

[9]

FRIEDT O, IN PRESS

[10] Hall effect in single crystal Ca2-xSrxRuO4 -: art. no. 161102 [J].

Galvin, LM ;

Perry, RS ;

Tyler, AW ;

Mackenzie, AP ;

Nakatsuji, S ;

Maeno, Y .

PHYSICAL REVIEW B, 2001, 63 (16)