Nature of the transition between a ferromagnetic metal and a spin-glass insulator in pyrochlore molybdates

N. Hanasaki, K. Watanabe, T. Ohtsuka, I. Kézsmárki, S. Iguchi, S. Miyasaka, Y. Tokura

Research output: Contribution to journalArticle

54 Citations (Scopus)

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 languageEnglish
Article number086401
JournalPhysical Review Letters
Volume99
Issue number8
DOIs
Publication statusPublished - Aug 21 2007

Fingerprint

molybdates
spin glass
insulators
specific heat
metals
frustration
Fermi surfaces
rare earth elements
magnetic permeability
scaling
orbitals
causes
electronics
ions

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 journalArticle

Hanasaki, N. ; Watanabe, K. ; Ohtsuka, T. ; Kézsmárki, I. ; Iguchi, S. ; Miyasaka, S. ; Tokura, Y. / Nature of the transition between a ferromagnetic metal and a spin-glass insulator in pyrochlore molybdates. In: Physical Review Letters. 2007 ; Vol. 99, No. 8.
@article{bb36e0ecce9a44b79aa1083217b92810,
title = "Nature of the transition between a ferromagnetic metal and a spin-glass insulator in pyrochlore molybdates",
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.",
author = "N. Hanasaki and K. Watanabe and T. Ohtsuka and I. K{\'e}zsm{\'a}rki and S. Iguchi and S. Miyasaka and Y. Tokura",
year = "2007",
month = "8",
day = "21",
doi = "10.1103/PhysRevLett.99.086401",
language = "English",
volume = "99",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "8",

}

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 -