Development of high-pressure, high-field and multifrequency electron spin resonance system.

The electron spin resonance (ESR) system which covers the magnetic field region up to 16 T, the quasicontinuous frequency region from 60 to 700 GHz, the temperature region from 1.8 to 4.2 K, and the hydrostatic pressure region up to 1.1 GPa has been developed. This is the first pulsed high-field and multifrequency ESR system with the pressure region over 1 GPa as far as we know. Transmission ESR spectra under hydrostatic pressure can be obtained by combining a piston-cylinder-type pressure cell and the pulsed magnetic field ESR apparatus. The pressure cell consists of a NiCrAl cylinder and sapphire or zirconia inner parts. The use of sapphire or zirconia as inner parts enables us to observe ESR under pressure because these inner parts have high transmittance for the electromagnetic wave with millimeter and submillimeter wavelengths. We have successfully applied this system for the pressure dependence measurements of an isolated spin system NiSnCl(6)6H(2)O up to 1.1 GPa. It was found that the single ion anisotropy parameter D of this compound strongly depends on pressure. The parameter D is approximately proportional to the pressure up to 0.75 GPa, and the relation between D and the pressure can be used for the pressure calibration of this high-field and high-pressure ESR system.

[1]  Y. Uwatoko,et al.  ESR Measurements of KCuCl3 under Multi Extreme Conditions , 2006 .

[2]  K. Kindo,et al.  Recent developments of high field ESR systems in Kobe , 2006 .

[3]  Y. Uwatoko,et al.  Development and application of high field and high pressure ESR system , 2006 .

[4]  Y. Uwatoko,et al.  High-field ESR measurements of CsCuCl3 under pressure , 2004 .

[5]  M. Azuma,et al.  High Field ESR Study of the S=1/2 Diamond-Chain Substance Cu3(CO3)2(OH)2 up to the Magnetization Plateau Region , 2003 .

[6]  Y. Uwatoko,et al.  High Field ESR Measurements Under Pressure , 2003 .

[7]  Takehiko Matsumoto.  Materials for High-Pressure Apparatus. , 2002 .

[8]  H. Kikuchi,et al.  High-field ESR measurements of a bond alternating Heisenberg chain system Ni2(μ-N3)3(dpt)2(ClO4) , 2001 .

[9]  J. Akimitsu,et al.  Development of a high-field ESR system under high pressure , 2000 .

[10]  N. Mōri,et al.  High Pressure Apparatus for Magnetization Measurements , 1997 .

[11]  I. Chan,et al.  Enhanced sensitivity for high-pressure EPR using dielectric resonators , 1992 .

[12]  M. Motokawa,et al.  Submillimeter EPR of Co:Rb2MgF4 and anomalous g-values , 1990, International Conference on Infrared and Millimeter Waves.

[13]  J. Pifer,et al.  Electron paramagnetic resonance at high pressure using a diamond anvil cell , 1985 .

[14]  S. A. Friedberg,et al.  Temperature dependence of the ESR spectrum of NiSnCl 6 6H 2 O , 1975 .

[15]  L. Polgar,et al.  Low Temperature Magnetic and Thermal Properties NiSnCl6:6H2O. , 1972 .

[16]  R. N. Rogers,et al.  Electron Spin Resonance , 1968 .

[17]  T. F. Smith,et al.  Will pressure destroy superconductivity , 1967 .

[18]  W. M. Walsh,et al.  Paramagnetic Resonance of Nickel Fluosilicate under High Hydrostatic Pressure , 1957 .