12037-71-7Relevant articles and documents
Thermal Properties of Heavy Fermion Compound YbP
Tateiwa, Naoyuki,Kobayashi, Tatsuo C.,Amaya, Kiichi,Li, Dexin,Shiokawa, Yoshinobu,Suzuki, Takashi
, p. 1365 - 1369 (2002)
Low-temperature specific heat and its field-dependence up to 16T was measured in a stoichiometric single crystal of YbP. A sharp peak was observed at TN = 0.53 K in zero magnetic field. Application of external field seems to induce a new magnetic phase above 11T. The field dependence of the transition temperature in the high-field phase is different from that of the low field phase. The linear coefficient of the electronic specific heat is estimated as 120 mJ/mol·K2 from low temperature specfic heat, suggesting heavy Fermion state in YbP.
New pnictides with the CaAl2Si2 type structure and the stability range of this type
Wartenberg, Franziska,Kranenberg, Christian,Pocha, Regina,Johrendt, Dirk,Mewis, Albrecht,Hoffmann, Rolf-Dieter,Mosel, Bernd D.,P?ttgen, Rainer
, p. 1270 - 1276 (2002)
Five new compounds were synthesized by heating mixtures of the elements at 600 - 1000°C and investigated by powder and single crystal X-ray methods. EuMg2P2 (a = 4.280(1), c = 7.164(3) A?), EuMg2As2 (a = 4.393(1), c= 7.321(1) A?), EuMg2Sb2 (a = 4.695(1), c = 7.0724(2) A?), YbMg2Sb2 (a = 4.650(1), c = 7.540(2) A?), and SrLiA1Sb2 (a = 4.584(3), c = 7.697(9) A?) crystallize with the CaA12Si2 type structure (P3?m1; Z = 1). The magnetic susceptibility of EuMg2Sb2 shows Curie-Weiss behavior with an experimental magnetic moment of 7.48(2) μB/Eu atom and a Weiss constant Θ = 3.2(1) K. EuMg2Sb2 is ordered antiferromagnetically at 8.2(3) K. Magnetisation measurements at 4.5 K show a linear increase and a saturation for a magnetic moment of 5.9(1) μB/EU at 5.5 T, indicating an almost parallel spin alignment with increasing field strength. 151Eu Mo?ssbauer spectra at 78 K show an isomer shift of-11.69(5) mm/s, compatible with divalent europium. At 4.2 K we observe full hyperfine field splitting with 23 T. The 121Sb spectrum at 4.2 K shows a transferred hyperfine field of 8(2) T at an isomer shift of -7.9(3) mm/s. From the band structure of EuMg2Sb2 we draw the conclusion, that analogous compounds of trivalent rare-earth metals with CaA12Si2 type structure should not exist due to electronic reasons.
Influence of YbP on the thermoelectric properties of n-type P doped Si95Ge5 alloy
Sui, Fan,Bux, Sabah K.,Kauzlarich, Susan M.
, p. 624 - 630 (2018)
Since the report of high zT in Si95Ge5 there has been significant interest in low Ge alloy compositions for thermoelectric applications. The application of YbP was explored as a means to lower thermal conductivity. A series of 3% pho
Electrical transport properties of stoichiometric YbP single crystal
Li,Sumiyama,Suzuki,Oyamada,Hashi,Suzuki
, p. 12036 - 12040 (1998)
A large single crystal of stoichiometric YbP was grown by the mineralization method. We report the electrical resistivity, magnetoresistance, and Hall-effect measurements of this sample. These data are used to calculate the temperature dependences of the mobilities of electrons and holes as well as the carrier concentrations based on the simple two-band model. The results clearly indicate that transport properties in YbP are mainly determined by the conduction-band electrons, though an equal number of valence-band holes is present. The resistivity does not show the - lnT behavior characteristic of Kondo compounds.
Synthesis and structural characterization of the ternary Zintl phases AE3Al2Pn4 and AE3Ga 2Pn4 (AE=Ca, Sr, Ba, Eu; Pn=P, As)
He, Hua,Tyson, Chauntae,Saito, Maia,Bobev, Svilen
, p. 59 - 65 (2012)
Ten new ternary phosphides and arsenides with empirical formulae AE 3Al2Pn4 and AE3Ga2Pn 4 (AE=Ca, Sr, Ba, Eu; Pn=P, As) have been synthesized using molten Ga, Al, and Pb fluxes. They have been structurally characterized by single-crystal and powder X-ray diffraction to form with two different structures - Ca3Al2P4, Sr3Al 2As4, Eu3Al2P4, Eu 3Al2As4, Ca3Ga2P 4, Sr3Ga2P4, Sr3Ga 2As4, and Eu3Ga2As4 crystallize with the Ca3Al2As4 structure type (space group C2/c, Z=4); Ba3Al2P4 and Ba 3Al2As4 adopt the Na3Fe 2S4 structure type (space group Pnma, Z=4). The polyanions in both structures are made up of TrPn4 tetrahedra, which share common corners and edges to form [TrPn2]32 layers in the phases with the Ca3Al2As4 structure, and [TrP n2]31 chains in Ba3Al2P4 and Ba 3Al2As4 with the Na3Fe 2S4 structure type. The valence electron count for all of these compounds follows the ZintlKlemm rules. Electronic band structure calculations confirm them to be semiconductors.
Phase transitions of lanthanide monophosphides with NaCl-type structure at high pressures
Adachi, Takafumi,Shirotani, Ichimin,Hayashi, Junichi,Shimomura, Osamu
, p. 389 - 393 (2008/10/09)
Lanthanide monophosphides LnP (Ln = La, Ce, Pr, Nd, Sm, Gd, Tb, Tm and Yb) with a NaCl-type structure have systematically been prepared at high temperatures. Using synchrotron radiation, X-ray diffractions of LnP have been studied up to 61 GPa at room temperature. The NaCl-CsCl transition for CeP is found at around 25 GPa. First-order phase transitions of LnP (Ln = La, Pr and Nd) with the crystallographic change occur at around 24, 26 and 30 GPa, respectively. The structure of the high pressure phases of these phosphides is a body center tetragonal structure (Ln: 0, 0, 0; P: 1/2, 1/2, 1/2; space group P4/mmm), which can be seen as the distorted CsCl-type structure. The Pr-P distance in the high pressure form of PrP is 2.789 A. This almost agrees with the sum of covalent radii of Pr and P. The Pr-P bond has the covalent character at very high pressures. Similar results are also obtained for LaP and NdP. The pressure-induced phase transitions of SmP, GdP, TbP, TmP and YbP occur at around 35, 40, 38, 53 and 51 GPa, respectively. The structure of the high pressure phase is unknown. The phase transitions of LnP with many f-electrons are not due to the mechanism of the ordinary NaCl-CsCl transition. The transition pressures of LnP increase with decreasing the lattice constants in the NaCl-type structure, which decrease with increasing atomic number of the lanthanide atoms.
31P NMR studies of the magnetically ordered heavy-electron compound YbP
Takagi, Shigeru,Oyamada, Akira,Kasuya, Tadao
, p. 1456 - 1465 (2008/10/08)
The microscopic magnetic properties of the heavy-electron compound YbP have been investigated by 31P NMR at temperatures from 0.38 to 600 K. The observations of both an abrupt decrease of 1/T1 at around 0.7 K and additional broadening of the spectrum below this temperature show that YbP orders magnetically at low temperatures. In the paramagnetic state, the Knight shift vs susceptibility plot exhibits a marked change of the slope at around 100 K with a larger hyperfine coupling constant of -4.02 kOe/μB below 100 K. Based on a semimetallic band structure of the compound, a simple model is presented, in which the previously observed anomalous broad maximum in the low-temperature specific heat is ascribed to the Kondo effect due to a large mixing between a Γ6 ground state of 4f hole of Yb3+ ion and occupied P-derived 3p states in the valence bands. The contribution of this p-f mixing mechanism to the transferred hyperfine interaction is also evaluated.
