Space Efficient Opposed-Anvil High-Pressure Cell and Its Application to Optical and NMR Measurements up to 9 GPa

Abstract

We have developed a new type of opposed-anvil high pressure cell with substantially improved space efficiency. The clamp cell and the gasket are made of non-magnetic Ni-Cr-Al alloy. Non-magnetic tungsten carbide (NMWC) is used for the anvils. The assembled cell with the dimension 29 mm  41 mm is capable of generating pressure up to 9 GPa over a relatively large volume of 7 mm 3 . Our cell is particularly suitable for those experiments which require large sample space to achieve good signal-to-noise ratio, such as the nuclear magnetic resonance (NMR) experiment. Argon is used as the pressure transmitting medium to obtain good hydrostaticity. The pressure was calibrated in situ by measuring the fluorescence from ruby through a transparent moissanite (6H-SiC) window. We have measured the pressure and temperature dependences of the 63 Cu nuclear-quadrupole-resonance (NQR) frequency of Cu 2 O, the in-plane Knight shift of metallic tin, and the Knight shift of platinum. These quantities can be used as reliable manometers to determine the pressure values in situ during the NMR/NQR experiments up to 9 GPa.

Pressure Induced Superconductivity on the border of Magnetic Order in MnP

“…However, the pressure and temperature ranges in the previous studies were far from the magnetic QCP. By utilizing the recently developed highpressure techniques [19][20][21][22][23], we have reinvestigated this problem in an extended pressure and temperature range, and surprisingly found that MnP becomes superconducting below T sc ≈ 1 K near the magnetic QCP at P c ≈ 8 GPa.…”

10 GPa-Class High-Pressure NMR Technique Realized by the New Cell with Improved Space Efficiency

“…Masashi TAKIGAWA 1 We describe our recent progress in high-pressure nuclear magnetic resonance (NMR) technique, which extends the range of practical NMR experiments to 10 GPa-class. The new opposed-anvil type cell has significantly large sample space, though the whole clamp cell size is small enough to put within superconducting magnets or fridges.…”

High-sensitivity NMR beyond 200,000 atmospheres of pressure

“…The pressure cell, a CuBe based piston-cylinder design had been used by a collaborating group at Cambridge University for De Haas-van Alphen type of studies [25], and was retrofitted for NMR in Leipzig. Simultaneously, in 2009, Kitagawa introduced [26] a clamp cell design made of a Ni-Cr-Al alloy and non-magnetic tungsten carbide anvils, allowing for relatively large sample volumes of several cubic millimeters; focusing their investigations on heavy fermionic systems [27][28][29] at pressures up to 10 GPa [30].…”