Abstract
The metal-insulator transition has been investigated for pyrochlore molybdates R2Mo2O7 with nonmagnetic rare-earth ions R. The dynamical scaling analysis of ac susceptibility reveals that the geometrical frustration causes the atomic spin-glass state. The reentrant spin-glass phase exists below the ferromagnetic transition. The electronic specific heat is enhanced as compared to the band calculation result, perhaps due to the orbital fluctuation in the half-metallic ferromagnetic state. The large specific heat is rather reduced upon the transition, likely because the short-range antiferromagnetic fluctuation shrinks the Fermi surface.
| Original language | English |
|---|---|
| Article number | 086401 |
| Journal | Physical Review Letters |
| Volume | 99 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug 21 2007 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Nature of the transition between a ferromagnetic metal and a spin-glass insulator in pyrochlore molybdates. / Hanasaki, N.; Watanabe, K.; Ohtsuka, T.; Kézsmárki, I.; Iguchi, S.; Miyasaka, S.; Tokura, Y.
In: Physical Review Letters, Vol. 99, No. 8, 086401, 21.08.2007.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Nature of the transition between a ferromagnetic metal and a spin-glass insulator in pyrochlore molybdates
AU - Hanasaki, N.
AU - Watanabe, K.
AU - Ohtsuka, T.
AU - Kézsmárki, I.
AU - Iguchi, S.
AU - Miyasaka, S.
AU - Tokura, Y.
PY - 2007/8/21
Y1 - 2007/8/21
N2 - The metal-insulator transition has been investigated for pyrochlore molybdates R2Mo2O7 with nonmagnetic rare-earth ions R. The dynamical scaling analysis of ac susceptibility reveals that the geometrical frustration causes the atomic spin-glass state. The reentrant spin-glass phase exists below the ferromagnetic transition. The electronic specific heat is enhanced as compared to the band calculation result, perhaps due to the orbital fluctuation in the half-metallic ferromagnetic state. The large specific heat is rather reduced upon the transition, likely because the short-range antiferromagnetic fluctuation shrinks the Fermi surface.
AB - The metal-insulator transition has been investigated for pyrochlore molybdates R2Mo2O7 with nonmagnetic rare-earth ions R. The dynamical scaling analysis of ac susceptibility reveals that the geometrical frustration causes the atomic spin-glass state. The reentrant spin-glass phase exists below the ferromagnetic transition. The electronic specific heat is enhanced as compared to the band calculation result, perhaps due to the orbital fluctuation in the half-metallic ferromagnetic state. The large specific heat is rather reduced upon the transition, likely because the short-range antiferromagnetic fluctuation shrinks the Fermi surface.
UR - http://www.scopus.com/inward/record.url?scp=34548178944&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34548178944&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.99.086401
DO - 10.1103/PhysRevLett.99.086401
M3 - Article
C2 - 17930963
AN - SCOPUS:34548178944
VL - 99
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 8
M1 - 086401
ER -