Continuous magnetic and structural phase transitions in Fe1+yTe

Journal Article · Sun Jan 01 04:00:00 EST 2012 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.85.085105· OSTI ID:1038796

Zalinznyak, I. ^[1]; Xu, Zhijun ^[2]; Wen, Jianzhong ^[2]; Tranquada, John M. ^[1]; Gu, G. D. ^[1]; Solovyov, Vyachelslav F ^[2]; Glazkov, V N ^[3]; Zheludev, Andrey I ^[2]; Garlea, Vasile O ^[2]; Stone, Matthew B ^[2]

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1. Brookhaven National Laboratory (BNL)
2. ORNL
3. P. L. Kapitza Institute for Physical Problems RAS, Moscow, Russia

We report a sequence of continuous phase transformations in iron telluride, Fe{sub 1+y}Te with y=0.10(1), which is observed by combining neutron diffraction, magnetic susceptibility, and specific-heat measurements on single-crystal samples. While a gradual increase of magnetic scattering near the wave vector (0.5,0,0.5) is seen below T {approx} 70 K, a temperature where the discontinuous first-order magnetostructural phase transition is found in systems with small y ({approx}<0.06), the reduction of the lattice symmetry in Fe{sub 1.1}Te only occurs at T{sub s} {approx} 63 K. Below T{sub N} {approx} 57.5 K, the long-range magnetic order develops, the incommensurate wave vector Q{sub m} of which varies with temperature. Finally, at T{sub m} {approx}< 45 K, the system enters the low-T phase, where Q{sub m} is locked at {approx}(0.48,0,0.5). We conclude that these instabilities are weak compared to the strength of the underlying interactions, and we suggest that the impact of the Fe interstitials on the transitions can be treated with random-field models.

• Research Organization: Oak Ridge National Laboratory (ORNL); Spallation Neutron Source
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1038796
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 8 Vol. 85; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
79 ASTRONOMY AND ASTROPHYSICS
INTERSTITIALS
IRON TELLURIDES
MAGNETIC SUSCEPTIBILITY
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
SCATTERING
SPECIFIC HEAT
SYMMETRY
VECTORS