Structural fluctuations in the spin-liquid state of Tb2Ti2O7

被引：84

作者：

Ruff, J. P. C. ^{[1
]}

Gaulin, B. D.

Castellan, J. P.

Rule, K. C.

Clancy, J. P.

Rodriguez, J.

Dabkowska, H. A.

机构：

[1] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

[2] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.99.237202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High-resolution x-ray scattering measurements on single crystal Tb(2)Ti(2)O(7) reveal finite structural correlations at low temperatures. This geometrically frustrated pyrochlore is known to exhibit a spin-liquid or cooperative paramagnetic state at temperatures below similar to 20 K. Parametric studies of structural Bragg peaks appropriate to the Fd (3) over barm space group of Tb(2)Ti(2)O(7) reveal substantial broadening and peak intensity reduction in the temperature regime 20 K to 300 mK. We also observe a small, anomalous lattice expansion on cooling below a density maximum at similar to 18 K. These measurements are consistent with the development of fluctuations above a cooperative Jahn-Teller, cubic-tetragonal phase transition at very low temperatures.

引用

页数：4

共 28 条

[1]

Aleksandrov I. V., 1985, Soviet Physics - JETP, V62, P1287

[2] 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)

[3] Dipolar interactions and origin of spin ice in Ising pyrochlore magnets [J].

den Hertog, BC ;

Gingras, MJP .

PHYSICAL REVIEW LETTERS, 2000, 84 (15) :3430-3433

[4]

DIEP HT, 2004, FRUSTRATED SPIN SYST, P36129

[5] Theory of paramagnetic scattering in highly frustrated magnets with long-range dipole-dipole interactions:: The case of the Tb2Ti2O7 pyrochlore antiferromagnet -: art. no. 174426 [J].

Enjalran, M ;

Gingras, MJP .

PHYSICAL REVIEW B, 2004, 70 (17) :1-17

[6] Dynamic frustrated magnetism in Tb2Ti2O7 at 50 mK -: art. no. 180401 [J].

Gardner, JS ;

Keren, A ;

Ehlers, G ;

Stock, C ;

Segal, E ;

Roper, JM ;

Fåk, B ;

Stone, MB ;

Hammar, PR ;

Reich, DH ;

Gaulin, BD .

PHYSICAL REVIEW B, 2003, 68 (18)

[7] Neutron scattering studies of the cooperative paramagnet pyrochlore Tb2Ti2O7 -: art. no. 224416 [J].

Gardner, JS ;

Gaulin, BD ;

Berlinsky, AJ ;

Waldron, P ;

Dunsiger, SR ;

Raju, NP ;

Greedan, JE .

PHYSICAL REVIEW B, 2001, 64 (22)

[8] Cooperative paramagnetism in the geometrically frustrated pyrochlore antiferromagnet Tb2Ti2O7 [J].

Gardner, JS ;

Dunsiger, SR ;

Gaulin, BD ;

Gingras, MJP ;

Greedan, JE ;

Kiefl, RF ;

Lumsden, MD ;

MacFarlane, WA ;

Raju, NP ;

Sonier, JE ;

Swainson, I ;

Tun, Z .

PHYSICAL REVIEW LETTERS, 1999, 82 (05) :1012-1015

[9] Single crystal growth by the floating-zone method of a geometrically frustrated pyrochlore antiferromagnet, Tb2Ti2O7 [J].

Gardner, JS ;

Gaulin, BD ;

Paul, DM .

JOURNAL OF CRYSTAL GROWTH, 1998, 191 (04) :740-745

[10] COOPERATIVE JAHN-TELLER EFFECTS [J].

GEHRING, GA ;

GEHRING, KA .

REPORTS ON PROGRESS IN PHYSICS, 1975, 38 (01) :1-+

← 1 2 3 →