Drastic change of magnetic phase diagram in doped quantum antiferromagnet TlCu1-xMgxCl3

TlCuCl3 is a coupled spin dimer system, which has a singlet ground state with an excitation gap of δ/gμB=5.5 T. TlCu1-xMgxCl3 doped with nonmagnetic Mg2+ ions undergoes impurity-induced magnetic ordering. Because triplet excitation with a finite gap still remains, this doped system can also undergo...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Physical Society of Japan 2006-03, Vol.75 (3)
Main Authors: FUJISAWA, Masashi, ONO, Toshio, FUJIWARA, Hideyasu, TANAKA, Hidekazu, SIKOLENKO, Vadim, MEISSNER, Michael, SMEIBIDL, Peter, GERISCHER, Sebastian, GRAF, Hans A
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Physics
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:TlCuCl3 is a coupled spin dimer system, which has a singlet ground state with an excitation gap of δ/gμB=5.5 T. TlCu1-xMgxCl3 doped with nonmagnetic Mg2+ ions undergoes impurity-induced magnetic ordering. Because triplet excitation with a finite gap still remains, this doped system can also undergo magnetic-field-induced magnetic ordering. Through specific heat measurements and neutron scattering experiments under a magnetic field, we investigated the phase diagram in TlCu1-xMgxCl3 with x∼0.01, and found that impurity- and field-induced ordered phases are the same. The gapped spin liquid state observed in pure TlCuCl3 is completely wiped out by the small amount of doping.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.75.033702