High Field ESR Measurements Under Pressure

Sakurai, Takahiro; Saruhashi, M.; Hirano, Tomoya; Inagaki, Yuji; Okubo, Susumu; Kunimoto, Takashi; Ohta, H.; Tanaka, Hidekazu; Uwatoko, Yoshiya

doi:10.1143/jpsjs.72sb.156

Cited by 11 publications

(12 citation statements)

References 21 publications

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“…CsCuCl 3 undergoes the antiferromagnetic transition at T N = 10 K and forms the 120 • structure in the c-plane. It is known that the quantum-fluctuation-induced phase transition occurs under a high magnetic field and numerous studies have tried to control this transition by changing the magnetic anisotropy by applying the chemical [26] and physical pressures [27,28]. Another reason for the interest in this material is the structural phase transition induced by the pressure.…”

Section: Application To Magnetic Materialsmentioning

confidence: 99%

Development of multi-frequency ESR system for high-pressure measurements up to 2.5 GPa

Sakurai

Fujimoto

Matsui

et al. 2015

Journal of Magnetic Resonance

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Section: Application To Magnetic Materialsmentioning

confidence: 99%

Development of multi-frequency ESR system for high-pressure measurements up to 2.5 GPa

Sakurai

Fujimoto

Matsui

et al. 2015

Journal of Magnetic Resonance

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“…Consequently, it causes a heating of a sample when a heat flow occurs from the pressure cell to a sample. 9,10 The important physical quantities are the electric resistance of the cylinder and the thermal diffusivities of materials between a sample and the cylinder. Since the electric resistance of the cylinder determines the quantity of the eddy current, the higher resistance cylinder has a lower Joule heat that occurs under the same charging voltage.…”

Section: Eddy Current Effectmentioning

confidence: 99%

“…In this article, we will present a further improved system which reaches a pressure of 1.1 GPa. A few problems caused by an eddy current, 9,10 which often disturb precise measurements in experiments with a combination of the pulsed magnetic field and the pressure cell, have been almost solved in this system. In addition to the outline of this ESR system, an application to an isolated spin system will be demonstrated.…”

Section: Introductionmentioning

confidence: 99%

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

Sakurai

Taketani

Tomita

et al. 2007

Review of Scientific Instruments

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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.

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“…The details of the submillimeter wave ESR under pressure will be described in the separate paper in this proceedings. 33) In the rest of the paper, we will deal with our submillimeter wave ESR study of the quantum spin system BaCu 2 (Si 1−x Ge x ) 2 O 7 .…”

Section: )mentioning

confidence: 99%

Submillimeter Wave ESR System Using the Pulsed Magnetic Field and Its Applications to One Dimensional Antiferromagnetic System

et al. 2003

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Submillimeter wave ESR measurements using the pulsed magnetic field is a powerful spectroscopic technique covering the wide frequency and magnetic field range with many advantages compared to the conventional X-band ESR measurements. Recent submillimeter wave ESR results showed that it is especially powerful to study the low dimensional antiferromagnets, are also presented. As an example of the study of quantum spin system, the investigation of the S=1/2 one dimensional antiferromagnets BaCu 2 (Si 1−x Ge x ) 2 O 7 (x=0, x=0.65), which have the staggered field effect in the system, is also presented in connection with the recent ESR theory by Oshikawa and Affleck (OA). Although both x=0 and x=0.65 systems show one dimensional behavior from the magnetic susceptibility, the temperature and frequency dependences of the mixed crystal x=0.65 system are well interpreted by the OA theory while they are not for the pure x=0 system. The antiferromagnetic resonance measurements of x=0 system (T N =8.9 K) have been performed up to 30 T at 1.8 K, and the magnetic phase transitions at 7 T and 16 T for H//a and H//c, respectively, are suggested for the first time.KEYWORDS: high field, high frequency, ESR, quantum spin system, line width, AFMR, BaCu 2 (Si 1−x Ge x ) 2 O 7 Submillimeter wave ESR and its facilities in JapanSubmillimeter wave ESR or, in other words, high field ESR measurements use higher frequency and higher magnetic field compared to the conventional X-band ESR measurement, which uses about 9.5 GHz and water cooling steady field up to 1 T. Due to these higher frequency and higher magnetic field, the submillimeter wave ESR has several advantages compared to the conventional X-band ESR. 1-3)(1) Stronger ESR absorption intensity (2) Higher resolution (3) Observation of a broad absorption line (4) Observation of ESR across the large energy splitting (5) Observation of ESR mode above the magnetic phase transition (6) Estimation of interchain exchange interaction in quasi one dimensional (1D) antiferromagnet The absorption intensity of ESR is proportional to the difference of Boltzman distribution between S Z =-1/2 and S Z =1/2 states, which are split by the Zeeman effect. Therefore, in principle, one will get stronger absorption intensity as one goes to the higher frequency because the Zeeman splitting will be larger. However, in reality, X-band ESR uses lock-in detection, a cavity etc. and has relatively higher sensitivity than submillimeter wave ESR. This means, on the contrary, there is still enough room for the submillimter wave ESR to gain its sensitivity, and we have to work on that. The magnetic field difference between the resonances with different gvalues becomes larger as the frequency is increased. If * E-mail address: ohta@phys.sci.kobe-u.ac.jp the field difference becomes larger than the line width, it will be easier to distinguish two resonances. Therefore, the submillimeter wave ESR gives higher resolution and this merit is also useful when analyzing the powder absorption.4) The line width of ESR is rel...

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High Field ESR Measurements Under Pressure

Cited by 11 publications

References 21 publications

Development of multi-frequency ESR system for high-pressure measurements up to 2.5 GPa

Development of multi-frequency ESR system for high-pressure measurements up to 2.5 GPa

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

Submillimeter Wave ESR System Using the Pulsed Magnetic Field and Its Applications to One Dimensional Antiferromagnetic System

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