Arumugam, S. ; Ghosh, Barnali ; Raychaudhuri, A. K. ; Tamil Selvan, N. R. ; Nakanishi, T. ; Yoshino, H. ; Murata, K. ; Mukovskii, Ya. M. (2009) Hydrostatic pressure (P≤8 GPa) induced metallization of ferromagnetic insulating La0.79Ca0.21MnO3 Journal of Applied Physics, 106 (2). 023905_1-023905_7. ISSN 0021-8979
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Official URL: http://jap.aip.org/resource/1/japiau/v106/i2/p0239...
Related URL: http://dx.doi.org/10.1063/1.3173445
Abstract
We show that application of hydrostatic pressure makes the ferromagnetic insulating phase of La0.79Ca0.21MnO3 metallic at a pressure of ∼1 GPa. On further increase in pressure (∼6 GPa) the high temperature polaronic state also crosses over to a metallic behavior. The application of the pressure also shifts the ferromagnetic TC of the material to higher temperature. We also find that in the process of pressure induced metallization, the material shows a coherence temperature where a highly resistive incoherent metal crosses over to a less resistive band type metal. The metallic phase so created under pressure has no appreciable magnetoresistance.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Institute of Physics. |
| Keywords: | Calcium Compounds; Carrier Density; Ferromagnetic Materials; High-pressure Effects; High-temperature Effects; Lanthanum Compounds; Magnetic Transition Temperature; Metallisation; Polarons |
| ID Code: | 42677 |
| Deposited On: | 06 Jun 2011 04:42 |
| Last Modified: | 06 Jun 2011 04:42 |
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