J. Phys. Soc. Jpn. 86, 033702 (2017) [4 Pages]
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LETTERS

Absence of Magnetic Long Range Order in Ba3ZnRu2O9: A Spin-Liquid Candidate in the S = 3/2 Dimer Lattice

Ichiro Terasaki1,, Taichi Igarashi1, Takayuki Nagai1, Kenji Tanabe1, Hiroki Taniguchi1, Taku Matsushita1, Nobuo Wada1, Atsushi Takata2, Takanori Kida2, Masayuki Hagiwara2, Kensuke Kobayashi3, Hajime Sagayama3, Reiji Kumai3, Hironori Nakao3, and Youichi Murakami3
+ Affiliations
1Department of Physics, Nagoya University, Nagoya 464-8602, Japan2Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan3Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
Received January 10, 2017; Accepted January 23, 2017; Published February 8, 2017

We have discovered a novel candidate for a spin liquid state in a ruthenium oxide composed of dimers of S = 3/2 spins of Ru5+, Ba3ZnRu2O9. This compound lacks a long range order down to 37 mK, which is a temperature 5000-times lower than the magnetic interaction scale of around 200 K. Partial substitution for Zn can continuously vary the magnetic ground state from an antiferromagnetic order to a spin-gapped state through the liquid state. This indicates that the spin-liquid state emerges from a delicate balance of inter- and intra-dimer interactions, and the spin state of the dimer plays a vital role. This unique feature should realize a new type of quantum magnetism.

©2017 The Physical Society of Japan
https://doi.org/10.7566/JPSJ.86.033702

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