NMR and NQR studies on transition-metal arsenide superconductors LaRu
2
As
2
, KCa
2
Fe
4
As
4
F
2
, and
A
2
Cr
3
As
3
Luo Jun
1, ‡
, Wang Chunguang
1, 2
, Wang Zhicheng
3
, Guo Qi
1
, Yang Ji
1
, Zhou Rui
1, 4
, Matano K
5
, Oguchi T
6
, Ren Zhian
1, 2
, Cao Guanghan
3
, Zheng Guo-Qing
1, 2, 5, §
Temperature dependence of the ratio
T
1
c
/
T
1
a
b
for As2 sites.