Magnetic order in geometrically frustrated Gd2(Ti1−xZrx)2O7(x=0.02and 0.15) single crystals

Autor:	D. McK. Paul, Da-Qian Liao, D. W. Baker, Martin R. Lees, Geetha Balakrishnan
Rok vydání:	2011
Předmět:	Physics Magnetization Crystallography Tetragonal crystal system Birefringence Condensed matter physics Magnetic order Doping Antiferromagnetism Condensed Matter Physics Electronic Optical and Magnetic Materials Phase diagram Magnetic field
Zdroj:	Physical Review B. 83
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.83.064403
Popis:	Single crystals of Gd(2)(Ti(1-x)Zr(x))(2)O(7) with x = 0.02 and 0.15 have been used to investigate the effects of Zr doping on the properties of the geometrically frustrated antiferromagnet Gd(2)Ti(2)O(7). Powder and single-crystal x-ray data, along with optical birefringence measurements, reveal that the x = 0.02 sample retains the cubic Fd (3) over barm structure of pure Gd(2)Ti(2)O(7), while the x = 0.15 composition adopts a tetragonal I4(1)/amd structure. Low-temperature magnetization and specific heat measurements show that for Gd(2)(Ti(0.98)Zr(0.02))(2)O(7) there are two magnetic transitions at T(N1) = 1.02 K and T(N2) = 0.70 K, but for Gd(2)(Ti(0.85)Zr(0.15))(2)O(7) a single transition is observed at T(N1) = 1.02 K. Changes in the specific heat with a magnetic field applied along the [110] and the [111] directions are used to construct the H-T phase diagrams for both samples.
Databáze:	OpenAIRE
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