Zero field mu SR and QLCR in the molecular metal system (DMe-DCNQI)(2)Cu

被引:5
作者
Pratt, FL
Pattenden, PA
Blundell, SJ
Jestadt, T
Chow, KH
Hayes, W
Kato, R
Tamura, M
Sawa, H
Aonuma, S
机构
[1] UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,TOKYO 106,JAPAN
[2] RUTHERFORD APPLETON LAB,ISIS,RIKEN RAL,DIDCOT OX11 0QX,OXON,ENGLAND
来源
HYPERFINE INTERACTIONS | 1997年 / 104卷 / 1-4期
关键词
D O I
10.1023/A:1012633422496
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
We have carried out implanted positive muon studies on the molecular metal system d(n)(DMe-DCNQI)(2)Cu in order to understand better its novel magnetic properties. Examples of these salts at different levels of deuteration were studied. The fully deuterated (d(8)) salt shows a metal-insulator (MI) transition around 80 K and a magnetic transition around 7 K. The muon spin relaxation rate is enhanced below the MI transition, reflecting the localisation of spins along the Cu columns, however, the increase in muon spin relaxation rate occurs well above the metal-insulator (MI) transition and suggests a slowdown of the spin fluctuations around 120 K. At temperatures below 7 K a zero field precession signal was observed as a result of the 3D magnetic ordering of the Cu spins. For a muon site associated with the ring of the DCNQI molecule, the local field distribution was found to be consistent with the previously proposed magnetic structure. A sharp nuclear quadrupolar level crossing resonance (QLCR) was observed at 50 G which was assigned to resonance with the imine nitrogen on the DCNQI molecule.
引用
收藏
页码:357 / 362
页数:6
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