Magnetic-field-induced condensation of triplons in Han Purple pigment BaCuSi2O6 -: art. no. 087203

被引：249

作者：

Jaime, M

Correa, VF

Harrison, N

Batista, CD

Kawashima, N

Kazuma, Y

Jorge, GA

Stern, R

Heinmaa, I

Zvyagin, SA

Sasago, Y

Uchinokura, K

机构：

[1] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA

[2] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[3] Tokyo Metropolitan Univ, Dept Phys, Tokyo 1920397, Japan

[4] Univ Buenos Aires, Dept Fis, Buenos Aires, DF, Argentina

[5] NICPB, EE-12618 Tallinn, Estonia

[6] Natl Magnet Field Lab, Tallahassee, FL 32310 USA

[7] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 08期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.93.087203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Besides being an ancient pigment, BaCuSi2O6 is a quasi-2D magnetic insulator with a gapped spin dimer ground state. The application of strong magnetic fields closes this gap, creating a gas of bosonic spin triplet excitations. The topology of the spin lattice makes BaCuSi2O6 an ideal candidate for studying the Bose-Einstein condensation of triplet excitations as a function of the external magnetic field, which acts as a chemical potential. In agreement with quantum Monte Carlo numerical simulations, we observe a distinct lambda anomaly in the specific heat together with a maximum in the magnetic susceptibility upon cooling down to liquid helium temperatures.

引用

页码：087203 / 1

页数：4

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