Effect of transition metal oxidation state on crystal structure and magnetic ordering in frustrated ABaM4O7 systems (A= Y, Ca; M= Co, Fe): X-ray diffraction, soft X-ray absorption, and magnetization studies

다국어 초록 (Multilingual Abstract)

We present X-ray diffraction patterns, soft Ca, Co, and Fe absorption spectra, magnetic susceptibility, and temperature dependent magnetization measurements in order to characterize ABaM4O7 solid solutions A = Y, Ca; M = Co, Fe). Cobalt ions are in 2 + and high-spin 3 + oxidation states. In the iron-doped solid solutions, Fe ions were found to be trivalent. Doping with Fe ions leads to a decreasing amount of Co3+ ions. Magnetic properties of the studied samples showed a spin-glass behavior. Negative values of the Curie–Weiss temperatures indicated the predominance of antiferromagnetic exchange interactions. The freezing point of the magnetic moments is 51 K and does not vary with the amount of Fe doping.

참고문헌 (Reference)

1 S.N. Shamin, "X-ray absorption spectroscopy and magnetic studies of Sr1 xCexMn1 yCoyO3 d solid solutions" 한국물리학회 16 (16): 1597-1602, 2016

2 V.V. Mesilov, "Valence states of iron ions in nanostructured yttrium iron garnet $Y_3Fe_5O_{12}$ studied by means of soft X-ray absorption spectroscopy" 185 : 598-601, 2012

3 M. Valldor, "The structure of the new compound $YBaCo_4O_7$ with a magnetic feature" 4 : 923-931, 2002

4 P.W. Anderson, "The resonating valence bond state in $La_2CuO_4$ and superconductivity" 235 : 1196-1198, 1987

5 E. Stavitski, "The CTM4XAS program for EELS and XAS spectral shape analysis of transition metal L edges" 41 : 687-694, 2010

6 J.D. Reim, "Structural invariance upon antiferromagnetic ordering in geometrically frustrated swedenborgite, $CaBaCo_2Fe_2O_7$" 47 : 2038-2047, 2014

7 D.I. Turkin, "Structural and magnetic investigations of $CaBaCo_{4-x}FexO_7$ solid solutions" 422 : 66-72, 2017

8 K. Singh, "Spinassisted ferroelectricity in ferrimagnetic $CaBaCo_4O_7$" 86 : 024410-, 2012

9 J.R. Stewart, "Spin dynamics, short-range order, and spin freezing in $Y_{0.5}Ca_{0.5}BaCo_4O_7$" 83 : 024405-, 2011

10 R.D. Shannon, "Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides" 32 : 751-767, 1976

11 M. Valldor, "Remnant magnetization above room temperature in the semiconductor $Y_{0.5}Ca_{0.5}BaCo_4O_7$" 8 : 1272-1280, 2006

12 J. Rodriguez-Carvajal, "Recent advances in magnetic structure determination by neutron powder diffraction" 192 : 55-69, 1993

13 F.M.F. de Groot, "Oxygen $1s$ and cobalt $2p$ X-ray absorption of cobalt oxides" 5 : 2277-2288, 1993

14 M. Imada, "Metal-insulator transitions" 70 : 1039-1263, 1998

15 G. Lawes, "Magnetically driven ferroelectric order in $Ni_3V_2O_8$" 95 : 087205-, 2005

16 V. Caignaert, "Magnetic structure of $CaBaCo_4O_7$: lifting of geometrical frustration towards ferrimagnetism" 81 : 094417-, 2010

17 M. Soda, "Magnetic measurements and neutron studies on $YBaCo_4O_7$ and $LuBaCo_4O_7$" 310 : e441-e442, 2007

18 P. Manuel, "Magnetic correlations in the extended Kagome $YBaCo_4O_7$ probed by single-crystal neutron scattering" 103 : 037202-, 2009

19 T. Kimura, "Magnetic control of ferroelectric polarization" 426 : 55-58, 2003

20 T. Sarkar, "Hysteretic "magnetic-transport-structural" transition in "114" cobaltites: size mismatch effect" 22 : 6467-6473, 2010

21 V. Caignaert, "Gigantic magnetic-field-induced polarization and magnetoelectric coupling in a ferrimagnetic oxide $CaBaCo_4O_7$" 88 : 174403-, 2013

22 M.M. Seikh, "Gigantic effect of iron doping upon magnetism in the "114" magnetoelectric $CaBaCo_4O_7$" 656 : 166-171, 2016

23 N. Hollmann, "Electronic and magnetic properties of the kagome systems $YBaCo_4O_7$ and $YBaCo_3MO_7$ M=(Al, Fe)" 80 : 085111-, 2009

24 N. Hur, "Electric polarization reversal and memory in a multiferroic material induced by magnetic fields" 429 : 392-395, 2004

25 F.J. Himpsel, "Determination of interface states for $CaF_2/Si(111)$ from near-edge X-ray-absorption measurements" 56 : 1497-1500, 1986

26 K. Okada, "Complementary roles of Co 2p X-ray absorption and photoemission spectra in CoO" 61 : 449-453, 1992

27 Y. Tokura, "Colossal Magnetoresistive Oxides" Gordon and Breach Science Publisher 2000

28 D. Khomskii, "Classifying multiferroics: mechanisms and effects" 2 : 20-, 2009

29 P. Rez, "Ca $L_{2,3}$ spectrum in amorphous and crystalline phases of calcium carbonate" 115 : 11193-11198, 2011

30 A. Borg, "Ca 3d unoccupied states in $Bi_2Sr_2CaCu_2O_8$ investigated by Ca $L_{2,3}$ x-ray-absorption near-edge structure" 46 : 8487-8495, 1992

31 W. Schweika, "Approaching the ground state of the Kagome antiferromagnet" 98 : 067201-, 2007

32 V.V. Mesilov, "Application of X-ray absorption spectroscopy to the investigation of charge states of iron ions in iron borate nanoceramics" 56 : 282-286, 2014

33 J. Orenstein, "Advances in the physics of high-temperature superconductivity" 288 : 468-474, 2000

34 B. Raveau, "A series of novel mixed valent ferrimagnetic oxides with a TC up to 270 K: $Ca_{1-x}YxBaFe_4O_7$" 20 : 6295-6297, 2008

35 F.M.F. de Groot, "$L_{2,3}$ x-ray-absorption edges of $d^0$ compounds: $K^+,\;Ca^{2+},\;Sc^{3+},\;and\;Ti^{4+}$ in $O_h$ (octahedral) symmetry" 41 : 928-937, 1990