Magnetic density of states at low energy in geometrically frustrated systems -: art. no. 047203

被引：72

作者：

Yaouanc, A ^{[1
]}

de Réotier, PD

Glazkov, V

Marin, C

Bonville, P

Hodges, JA

Gubbens, PCM

Sakarya, S

Baines, C

机构：

[1] CEA, DSM, Dept Rech Fondamentale Mat Condensee, F-38054 Grenoble, France

[2] CEA, DSM, Dept Rech Etat Condensee Atomes & Mol, F-91191 Gif Sur Yvette, France

[3] Delft Univ Technol, Dept Radiat Radionuclides & Reactors, NL-2629 JB Delft, Netherlands

[4] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.95.047203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using muon-spin-relaxation measurements we show that the pyrochlore compound Gd2Ti2O7, in its magnetically ordered phase below similar to 1 K, displays persistent spin dynamics down to temperatures as low as 20 mK. The characteristics of the induced muon relaxation can be accounted for by a scattering process involving two magnetic excitations, with a density of states characterized by an upturn at low energy and a small gap depending linearly on the temperature. We propose that such a density of states is a generic feature of geometrically frustrated magnetic materials.

引用

页数：4

共 39 条

[1]

Anderson P.W., 1984, Basic Notions of Condensed Matter Physics

[2] Effective hyperfine temperature in frustrated Gd2Sn2O7:: two level model and 155Gd Mossbauer measurements [J].

Bertin, E ;

Bonville, P ;

Bouchaud, JP ;

Hodges, JA ;

Sanchez, JP ;

Vulliet, P .

EUROPEAN PHYSICAL JOURNAL B, 2002, 27 (03) :347-354

[3] μSR study of the quantum dynamics in the frustrated S = 3/2 kagome bilayers -: art. no. 187201 [J].

Bono, D ;

Mendels, P ;

Collin, G ;

Blanchard, N ;

Bert, F ;

Amato, A ;

Baines, C ;

Hillier, AD .

PHYSICAL REVIEW LETTERS, 2004, 93 (18) :187201-1

[4] Transitions and spin dynamics at very low temperature in the pyrochlores Yb2Ti2O7 and Gd2Sn2O7 [J].

Bonville, P ;

Hodges, JA ;

Bertin, E ;

Bouchaud, JP ;

De Réotier, PD ;

Regnault, LP ;

Ronnow, HM ;

Sanchez, JP ;

Sosin, S ;

Yaouanc, A .

HYPERFINE INTERACTIONS, 2004, 156 (01) :103-111

[5] Low temperature magnetic properties of geometrically frustrated Gd2Sn2O7 and Gd2Ti2O7 [J].

Bonville, P ;

Hodges, JA ;

Ocio, M ;

Sanchez, JP ;

Vulliet, P ;

Sosin, S ;

Braithwaite, D .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2003, 15 (45) :7777-7787

[6] Planar spin fluctuations with a quadratic thermal dependence rate in spin liquid Gd3Ga5O12 -: art. no. 167202 [J].

Bonville, P ;

Hodges, JA ;

Sanchez, JP ;

Vulliet, P .

PHYSICAL REVIEW LETTERS, 2004, 92 (16) :167202-1

[7] Er2Ti2O7:: Evidence of quantum order by disorder in a frustrated antiferromagnet -: art. no. 020401 [J].

Champion, JDM ;

Harris, MJ ;

Holdsworth, PCW ;

Wills, AS ;

Balakrishnan, G ;

Bramwell, ST ;

Cizmár, E ;

Fennell, T ;

Gardner, JS ;

Lago, J ;

McMorrow, DF ;

Orendác, M ;

Orendácová, A ;

Paul, DM ;

Smith, RI ;

Telling, MTF ;

Wildes, A .

PHYSICAL REVIEW B, 2003, 68 (02)

[8] Order in the Heisenberg pyrochlore:: The magnetic structure of Gd2Ti2O7 -: art. no. 140407 [J].

Champion, JDM ;

Wills, AS ;

Fennell, T ;

Bramwell, ST ;

Gardner, JS ;

Green, MA .

PHYSICAL REVIEW B, 2001, 64 (14) :1404071-1404074

[9]

CHAMPION JDM, 2001, PHYS REV B, V64

[10] Probing magnetic excitations, fluctuations and correlation lengths by muon spin relaxation and rotation techniques [J].

de Réotier, PD ;

Gubbens, PCM ;

Yaouanc, A .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2004, 16 (40) :S4687-S4705

← 1 2 3 4 →