Spin glass behavior in RuSr2Gd1.5Ce0.5Cu2O10-δ -: art. no. 020407

被引：122

作者：

Cardoso, CA

Araujo-Moreira, FM

Awana, VPS

Takayama-Muromachi, E

de Lima, OF

Yamauchi, H

Karppinen, M

机构：

[1] Univ Fed Sao Carlos, Dept Fis, CMDMC, Grp Mat & Disposit, BR-13565905 Sao Carlos, SP, Brazil

[2] Superconducting Mat Ctr, Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil

[4] Tokyo Inst Technol, Mat Sci Lab, Yokohama, Kanagawa 2268503, Japan

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.67.020407

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The dynamics of the magnetic properties of polycrystalline RuSr2Gd1.5Ce0.5Cu2O10-delta (Ru-1222) have been studied by ac susceptibility and dc magnetization measurements, including relaxation and ageing studies. Ru-1222 is a reported magnetosuperconductor with Ru spins magnetic ordering at temperatures near 100 K and superconductivity in Cu-O-2 planes below T(c)similar to40 K. The exact nature of Ru spins magnetic ordering is still being debated, and no conclusion has been reached yet. In this work, a frequency-dependent cusp was observed in chi(ac) vs T measurements, which is interpreted as a spin glass transition. The change in the cusp position with frequency follows the Vogel-Fulcher law, which is commonly accepted to describe a spin-glass with magnetically interacting clusters. Such an interpretation is supported by thermoremanent magnetization (TRM) measurements at T=60 K. TRM relaxations are well described by a stretched exponential relation, and present significant aging effects.

引用

页数：4

共 29 条

[1] Possible ordering of Ru and Cu in the charge-reservoir of magneto-superconductor RuSr2GdCu2O8 (Ru-1212):: Magnetic, transport, and TEM microstructural studies [J].

Awana, VPS ;

Ichihara, S ;

Nakamura, J ;

Karppinen, M ;

Yamauchi, H ;

Yang, J ;

Yelon, WB ;

James, WJ ;

Malik, SK .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (10) :8501-8503

[2] Comparison of magneto-superconductive properties of RuSr2GdCu2O8-δ and RuSr2Gd1.5Ce0.5Cu2O10-δ [J].

Awana, VPS ;

Ichihara, S ;

Karppinen, M ;

Yamauchi, H .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2002, 378 :249-254

[3]

AWANA VPS, IN PRESS J LOW TEMP

[4]

BECK PA, 1978, PROG MATER SCI, V23, P1

[5] Coexistence of ferromagnetism and superconductivity in the hybrid ruthenate-cuprate compound RuSr2GdCu2O8 studied by muon spin rotation and dc magnetization [J].

Bernhard, C ;

Tallon, JL ;

Niedermayer, C ;

Blasius, T ;

Golnik, A ;

Brücher, E ;

Kremer, RK ;

Noakes, DR ;

Stronach, CE ;

Ansaldo, EJ .

PHYSICAL REVIEW B, 1999, 59 (21) :14099-14107

[6] Ferromagnetic correlations and mixed Ru valence in the magnetic superconductor RuSr2(Eu, Gd)Cu2O8 -: art. no. 054442 [J].

Butera, A ;

Fainstein, A ;

Winkler, E ;

Tallon, J .

PHYSICAL REVIEW B, 2001, 63 (05)

[7] Transport properties and specific heat of RuSr2GdCu2O8 and RuSr2Gd1.4Ce0.6Cu2Oy in magnetic fields -: art. no. 064506 [J].

Chen, XH ;

Sun, Z ;

Wang, KQ ;

Li, SY ;

Xiong, YM ;

Yu, M ;

Cao, LZ .

PHYSICAL REVIEW B, 2001, 63 (06)

[8] Crystal and magnetic structure of ferromagnetic superconducting RuSr2GdCu2O8 [J].

Chmaissem, O ;

Jorgensen, JD ;

Shaked, H ;

Dollar, P ;

Tallon, JL .

PHYSICAL REVIEW B, 2000, 61 (09) :6401-6407

[9] THEORY OF SPIN GLASSES [J].

EDWARDS, SF ;

ANDERSON, PW .

JOURNAL OF PHYSICS F-METAL PHYSICS, 1975, 5 (05) :965-974

[10]

Escote MT, 2002, PHYS REV B, V66, DOI 10.1103/PhysRevB.66.144503

← 1 2 3 →