Suppression of Metal–Insulator Transition in PrRu4P12under High Pressure Studied by Infrared Spectroscopy

2011 ◽  
Vol 80 (Suppl.A) ◽  
pp. SA092 ◽  
Author(s):  
Hidekazu Okamura ◽  
Ikuo Matsutori ◽  
Akira Takigawa ◽  
Ko Shoji ◽  
Kazuaki Miyata ◽  
...  
Keyword(s):  
High Pressure ◽  
Infrared Spectroscopy ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator

Orbital change manipulation metal–insulator transition temperature in W-doped VO2

2015 ◽  
Vol 17 (17) ◽  
pp. 11638-11646 ◽  
Author(s):  
Xinfeng He ◽  
Yijie Zeng ◽  
Xiaofeng Xu ◽  
Congcong Gu ◽  
Fei Chen ◽  
...  
Keyword(s):  
Phase Transition ◽  
Infrared Spectroscopy ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
First Principles ◽  
Insulator Transition ◽  
First Principles Calculations ◽  
Orbital Structure ◽  
Metal Insulator Transition ◽  
Metal Insulator

Using ultraviolet-infrared spectroscopy and first principles calculations, it is revealed that changes in the orbital structure can regulate the W-doped VO2 phase transition temperature.

Metal–insulator transition under high pressure in

2005 ◽  
Vol 359-361 ◽  
pp. 886-888 ◽  
Author(s):  
Hiroyuki Hidaka ◽  
Ikuma Ando ◽  
Hisashi Kotegawa ◽  
Tatsuo C. Kobayashi ◽  
Hisatomo Harima ◽  
...  
Keyword(s):  
High Pressure ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator

Spin-state-driven metal-insulator transition in(La,Sr)CoO3under high-pressure

2007 ◽  
Vol 75 (18) ◽  
Author(s):  
R. Lengsdorf ◽  
J.-P. Rueff ◽  
G. Vankó ◽  
T. Lorenz ◽  
L. H. Tjeng ◽  
...  
Keyword(s):  
High Pressure ◽  
Spin State ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator

HIGH PRESSURE STUDY OF NOVEL ELECTRONIC PROPERTIES IN Sr2Fe(W1-xMox)O6 NEAR METAL-INSULATOR TRANSITION

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3279-3284
Author(s):  
G. OOMI ◽  
S. KAJI ◽  
Y. TOMIOKA ◽  
Y. TOKURA
Keyword(s):  
High Pressure ◽  
Double Perovskite ◽  
Insulator Transition ◽  
Metallic State ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Electrical Resistivities ◽  
Insulating Properties ◽  
High Pressure Study ◽  
Variable Range Hopping Conduction

Electrical resistivities of double perovskite oxides Sr 2 Fe ( W 1-x Mo x) O 6 have been measured at high pressure and high magnetic field to elucidate the transport properties of these materials. It is found that the main mechanism of the transport in the semiconducting phase is variable range hopping conduction and the insulating properties are suppressed by high pressure to show a crossover to metallic state. The magnetoresistances of these oxides are revealed to decrease at high pressure above 1 GPa. Extremely large Grüneisen parameters are found near x = 0.2, where the metal-insulator transition occurs. The origin for these properties will be briefly discussed in connection with the phase diagram.

Metal—insulator transition of CuIr2(S,Se)4 under high pressure

1998 ◽  
Vol 177-181 ◽  
pp. 1363-1364 ◽  
Author(s):  
J. Tang ◽  
T. Matsumoto ◽  
T. Furubayashi ◽  
T. Kosaka ◽  
S. Nagata ◽  
...  
Keyword(s):  
High Pressure ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator

scholarly journals Suppression of metal-insulator transition at high pressure and pressure-induced magnetic ordering in pyrochlore oxide Nd2Ir2O7

2011 ◽  
Vol 83 (4) ◽  
Author(s):  
Masafumi Sakata ◽  
Tomoko Kagayama ◽  
Katsuya Shimizu ◽  
Kazuyuki Matsuhira ◽  
Seishi Takagi ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Ordering ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Pyrochlore Oxide

STUDY OF POSITRON LIFETIME AND INFRARED SPECTROSCOPY FOR Pr-SUBSTITUTED YBa2Cu3O7-δ SYSTEMS

2004 ◽  
Vol 18 (22) ◽  
pp. 3001-3014 ◽  
Author(s):  
GUIXIN CAO ◽  
JINCANG ZHANG ◽  
SHIXUN CAO ◽  
CHAO JING ◽  
XUECHU SHEN
Keyword(s):  
Infrared Spectroscopy ◽  
Infrared Absorption ◽  
Oxygen Vacancies ◽  
Positron Lifetime ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Short Lifetime ◽  
Long Lifetime

The Pr -substituted YBa 2 Cu 3 O 7-δ( Y 123) superconducting systems with the content of 0.0–1.0 have been systematically studied by positron lifetime and infrared absorption experiments. The results show that the short lifetime τ1 decreases as a function of Pr -substitution x below x=0.6, but when above x=0.6, it increases inversely. The long lifetime τ2 decreases as a function of Pr -substituted x. Based on the present results, we discuss that Pr 4+ substitutes on Ba 2+ ion and forms Pr Ba defects. The variation of τ1 is caused by the oxygen vacancies and τ2 is probably affected by the absence of Cu due to Pr Ba defects. The infrared absorption of Pr -substituted Y 123 systems gives three variational modes, located at 560 cm -1( A 1), 1435 cm -1( A 2) and 1631 cm -1( A 3) respectively. Here the A 3 mode shows that with Pr content increasing from x=0.1 to 1.0, the infrared absorption decreases and the peak tends to broaden. So, combining with the results of the positron lifetime spectra, we can argue that there always exists portion of Pr Ba defects in the Pr -substituted systems, and the Pr 4+ substituted into Ba 2+ is also increasing with the Pr content increasing. When the Pr content is 0.6, the systems have a metal-insulator transition and Pr Ba defects begin to domain the samples' microstructure.

Synthesis of a Novel Donor, BTFE-DMB, and Electrical Properties of its Iodine Salt

1992 ◽  
Vol 247 ◽  
Author(s):  
Makoto Mizutani ◽  
Keiji Tanaka ◽  
Kiyoshi Ikeda ◽  
Kazushige Kawabata
Keyword(s):  
High Pressure ◽  
Electrical Properties ◽  
Single Crystal ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator

ABSTRACT1, 4-Bis [2-(tetrathiafulvalen-2-yl)ethenyl] -2, 5-dimethylbenzene (BTFE-DMB) is synthesized and its structure is found to be planar. The single crystal of its iodine salts undergoes a metal-insulator transition about 180K. The compaction pellets of the iodine salts show the current dependent resistive anomaly under high pressure.

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