Low-temperature specific heat anomalies in the group V transition metals
Anomalies previously reported in the specific heat curve of normal-state niobium at 3 and 9.5 K prompted new measurements on single crystals of niobium, tantalum, and vanadium from their superconducting T/sub c/'s up to 20 K. The upper anomaly was confirmed in Nb and found to occur at 10.3 K. A...
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| Veröffentlicht in: | J. Low Temp. Phys.; (United States) 1977-08, Vol.28 (3-4), p.241-261 |
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| container_title | J. Low Temp. Phys.; (United States) |
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| creator | Leupold, H. A. Iafrate, G. J. Rothwarf, F. Breslin, J. T. Edmiston, D. AuCoin, T. R. |
| description | Anomalies previously reported in the specific heat curve of normal-state niobium at 3 and 9.5 K prompted new measurements on single crystals of niobium, tantalum, and vanadium from their superconducting T/sub c/'s up to 20 K. The upper anomaly was confirmed in Nb and found to occur at 10.3 K. At this temperature the C/T vs. T/sup 2/ curve changed abruptly from a line with constants ..gamma../sub 2/=7.67 mJ/K/sup 2/ mole and theta/sub 2/=241 K to one with ..gamma../sub 3/=9.16 mJ/K/sup 2/ mole and theta/sub 3/=250 K. The Nb T/sub c/ was 9.275 K. Anomalies similar to that occurring at 3 K in the niobium curve were discovered to exist in tantalum and vanadium as well, but at the higher temperatures of 7.19 and 7.47 K, respectively. The tantalum data yielded line constants of ..gamma../sub 1/=5.42 mJ/K/sup 2/ mole, theta/sub 1/=238 K, ..gamma../sub 2/=4.36 mJ/K/sup 2/ mole, and theta/sub 2/=228 K and a T/sub c/ of 4.475 K. For vanadium theta/sub 1/=397 K is higher than previous specific heat values of theta/sub 1/=382 K, and in agreement with that obtained from elastic constant measurements (399 K). The discontinuities in the slopes of the specific heat curves are analyzed in terms of anomalies in the electron and phonon spectra of the materials investigated. |
| doi_str_mv | 10.1007/BF00668217 |
| format | Article |
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A. ; Iafrate, G. J. ; Rothwarf, F. ; Breslin, J. T. ; Edmiston, D. ; AuCoin, T. R.</creator><creatorcontrib>Leupold, H. A. ; Iafrate, G. J. ; Rothwarf, F. ; Breslin, J. T. ; Edmiston, D. ; AuCoin, T. R. ; U. S. Army Electronics Technology and Devices Laboratory (ECOM), Fort Monmouth, New Jersey</creatorcontrib><description>Anomalies previously reported in the specific heat curve of normal-state niobium at 3 and 9.5 K prompted new measurements on single crystals of niobium, tantalum, and vanadium from their superconducting T/sub c/'s up to 20 K. The upper anomaly was confirmed in Nb and found to occur at 10.3 K. At this temperature the C/T vs. T/sup 2/ curve changed abruptly from a line with constants ..gamma../sub 2/=7.67 mJ/K/sup 2/ mole and theta/sub 2/=241 K to one with ..gamma../sub 3/=9.16 mJ/K/sup 2/ mole and theta/sub 3/=250 K. The Nb T/sub c/ was 9.275 K. Anomalies similar to that occurring at 3 K in the niobium curve were discovered to exist in tantalum and vanadium as well, but at the higher temperatures of 7.19 and 7.47 K, respectively. The tantalum data yielded line constants of ..gamma../sub 1/=5.42 mJ/K/sup 2/ mole, theta/sub 1/=238 K, ..gamma../sub 2/=4.36 mJ/K/sup 2/ mole, and theta/sub 2/=228 K and a T/sub c/ of 4.475 K. For vanadium theta/sub 1/=397 K is higher than previous specific heat values of theta/sub 1/=382 K, and in agreement with that obtained from elastic constant measurements (399 K). The discontinuities in the slopes of the specific heat curves are analyzed in terms of anomalies in the electron and phonon spectra of the materials investigated.</description><identifier>ISSN: 0022-2291</identifier><identifier>EISSN: 1573-7357</identifier><identifier>DOI: 10.1007/BF00668217</identifier><language>eng</language><publisher>United States</publisher><subject>360104 - Metals & Alloys- Physical Properties ; 656102 - Solid State Physics- Superconductivity- Acoustic, Electronic, Magnetic, Optical, & Thermal Phenomena- (-1987) ; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; ELECTRIC CONDUCTIVITY ; ELECTRICAL PROPERTIES ; ELEMENTS ; MATERIALS SCIENCE ; METALS ; NIOBIUM ; PHYSICAL PROPERTIES ; REFRACTORY METALS ; SPECIFIC HEAT ; SUPERCONDUCTIVITY ; TANTALUM ; TEMPERATURE DEPENDENCE ; THERMODYNAMIC PROPERTIES ; TRANSITION ELEMENTS ; ULTRALOW TEMPERATURE ; VANADIUM ; VERY LOW TEMPERATURE</subject><ispartof>J. Low Temp. 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S. Army Electronics Technology and Devices Laboratory (ECOM), Fort Monmouth, New Jersey</creatorcontrib><title>Low-temperature specific heat anomalies in the group V transition metals</title><title>J. Low Temp. Phys.; (United States)</title><description>Anomalies previously reported in the specific heat curve of normal-state niobium at 3 and 9.5 K prompted new measurements on single crystals of niobium, tantalum, and vanadium from their superconducting T/sub c/'s up to 20 K. The upper anomaly was confirmed in Nb and found to occur at 10.3 K. At this temperature the C/T vs. T/sup 2/ curve changed abruptly from a line with constants ..gamma../sub 2/=7.67 mJ/K/sup 2/ mole and theta/sub 2/=241 K to one with ..gamma../sub 3/=9.16 mJ/K/sup 2/ mole and theta/sub 3/=250 K. The Nb T/sub c/ was 9.275 K. Anomalies similar to that occurring at 3 K in the niobium curve were discovered to exist in tantalum and vanadium as well, but at the higher temperatures of 7.19 and 7.47 K, respectively. The tantalum data yielded line constants of ..gamma../sub 1/=5.42 mJ/K/sup 2/ mole, theta/sub 1/=238 K, ..gamma../sub 2/=4.36 mJ/K/sup 2/ mole, and theta/sub 2/=228 K and a T/sub c/ of 4.475 K. For vanadium theta/sub 1/=397 K is higher than previous specific heat values of theta/sub 1/=382 K, and in agreement with that obtained from elastic constant measurements (399 K). The discontinuities in the slopes of the specific heat curves are analyzed in terms of anomalies in the electron and phonon spectra of the materials investigated.</description><subject>360104 - Metals & Alloys- Physical Properties</subject><subject>656102 - Solid State Physics- Superconductivity- Acoustic, Electronic, Magnetic, Optical, & Thermal Phenomena- (-1987)</subject><subject>CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY</subject><subject>ELECTRIC CONDUCTIVITY</subject><subject>ELECTRICAL PROPERTIES</subject><subject>ELEMENTS</subject><subject>MATERIALS SCIENCE</subject><subject>METALS</subject><subject>NIOBIUM</subject><subject>PHYSICAL PROPERTIES</subject><subject>REFRACTORY METALS</subject><subject>SPECIFIC HEAT</subject><subject>SUPERCONDUCTIVITY</subject><subject>TANTALUM</subject><subject>TEMPERATURE DEPENDENCE</subject><subject>THERMODYNAMIC PROPERTIES</subject><subject>TRANSITION ELEMENTS</subject><subject>ULTRALOW TEMPERATURE</subject><subject>VANADIUM</subject><subject>VERY LOW TEMPERATURE</subject><issn>0022-2291</issn><issn>1573-7357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1977</creationdate><recordtype>article</recordtype><recordid>eNpF0EFLxDAQhuEgCq6rF39B8OBBqE6SpmmOuriusOBFvYY0Tt1I29QkRfz3Vlbw9DLwMIePkHMG1wxA3dytAaqq5kwdkAWTShRKSHVIFgCcF5xrdkxOUvoAAF1XYkE22_BVZOxHjDZPEWka0fnWO7pDm6kdQm87j4n6geYd0vcYppG-0hztkHz2YaA9ZtulU3LUzsGzvy7Jy_r-ebUptk8Pj6vbbeGEFLmwmmNlRV2XWlQVqEZr0WrbtA3OR8lUiQ2TTDmJsmRWgLPNm3BMCDnzuUtysf8bUvYmOZ_R7VwYBnTZKA610tWMLvdojOFzwpRN75PDrrMDhikZzmvJNcgZXu2hiyGliK0Zo-9t_DYMzO-i5n9R8QOhXWdB</recordid><startdate>197708</startdate><enddate>197708</enddate><creator>Leupold, H. A.</creator><creator>Iafrate, G. J.</creator><creator>Rothwarf, F.</creator><creator>Breslin, J. T.</creator><creator>Edmiston, D.</creator><creator>AuCoin, T. R.</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>OTOTI</scope></search><sort><creationdate>197708</creationdate><title>Low-temperature specific heat anomalies in the group V transition metals</title><author>Leupold, H. A. ; Iafrate, G. J. ; Rothwarf, F. ; Breslin, J. T. ; Edmiston, D. ; AuCoin, T. 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A.</creatorcontrib><creatorcontrib>Iafrate, G. J.</creatorcontrib><creatorcontrib>Rothwarf, F.</creatorcontrib><creatorcontrib>Breslin, J. T.</creatorcontrib><creatorcontrib>Edmiston, D.</creatorcontrib><creatorcontrib>AuCoin, T. R.</creatorcontrib><creatorcontrib>U. S. Army Electronics Technology and Devices Laboratory (ECOM), Fort Monmouth, New Jersey</creatorcontrib><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>OSTI.GOV</collection><jtitle>J. Low Temp. Phys.; (United States)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Leupold, H. A.</au><au>Iafrate, G. J.</au><au>Rothwarf, F.</au><au>Breslin, J. T.</au><au>Edmiston, D.</au><au>AuCoin, T. R.</au><aucorp>U. S. Army Electronics Technology and Devices Laboratory (ECOM), Fort Monmouth, New Jersey</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Low-temperature specific heat anomalies in the group V transition metals</atitle><jtitle>J. Low Temp. Phys.; (United States)</jtitle><date>1977-08</date><risdate>1977</risdate><volume>28</volume><issue>3-4</issue><spage>241</spage><epage>261</epage><pages>241-261</pages><issn>0022-2291</issn><eissn>1573-7357</eissn><abstract>Anomalies previously reported in the specific heat curve of normal-state niobium at 3 and 9.5 K prompted new measurements on single crystals of niobium, tantalum, and vanadium from their superconducting T/sub c/'s up to 20 K. The upper anomaly was confirmed in Nb and found to occur at 10.3 K. At this temperature the C/T vs. T/sup 2/ curve changed abruptly from a line with constants ..gamma../sub 2/=7.67 mJ/K/sup 2/ mole and theta/sub 2/=241 K to one with ..gamma../sub 3/=9.16 mJ/K/sup 2/ mole and theta/sub 3/=250 K. The Nb T/sub c/ was 9.275 K. Anomalies similar to that occurring at 3 K in the niobium curve were discovered to exist in tantalum and vanadium as well, but at the higher temperatures of 7.19 and 7.47 K, respectively. The tantalum data yielded line constants of ..gamma../sub 1/=5.42 mJ/K/sup 2/ mole, theta/sub 1/=238 K, ..gamma../sub 2/=4.36 mJ/K/sup 2/ mole, and theta/sub 2/=228 K and a T/sub c/ of 4.475 K. For vanadium theta/sub 1/=397 K is higher than previous specific heat values of theta/sub 1/=382 K, and in agreement with that obtained from elastic constant measurements (399 K). The discontinuities in the slopes of the specific heat curves are analyzed in terms of anomalies in the electron and phonon spectra of the materials investigated.</abstract><cop>United States</cop><doi>10.1007/BF00668217</doi><tpages>21</tpages></addata></record> |
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| subjects | 360104 - Metals & Alloys- Physical Properties 656102 - Solid State Physics- Superconductivity- Acoustic, Electronic, Magnetic, Optical, & Thermal Phenomena- (-1987) CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ELECTRIC CONDUCTIVITY ELECTRICAL PROPERTIES ELEMENTS MATERIALS SCIENCE METALS NIOBIUM PHYSICAL PROPERTIES REFRACTORY METALS SPECIFIC HEAT SUPERCONDUCTIVITY TANTALUM TEMPERATURE DEPENDENCE THERMODYNAMIC PROPERTIES TRANSITION ELEMENTS ULTRALOW TEMPERATURE VANADIUM VERY LOW TEMPERATURE |
| title | Low-temperature specific heat anomalies in the group V transition metals |
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